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Conexant RC336D Designer's Manual

Modem device sets for desktop applications
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Doc. No. 1154, Rev. 3
January 22, 1999

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Summary of Contents for Conexant RC336D

  • Page 1 Doc. No. 1154, Rev. 3 January 22, 1999...
  • Page 2 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Information provided by Conexant Systems, Inc. is believed to be accurate and reliable. However, no responsibility is assumed by Conexant for its use, nor any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of Conexant other than for circuitry embodied in Conexant products.

  • Page 3: Table Of Contents

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide INTRODUCTION... 1-1 SUMMARY ... 1-1 FEATURES ... 1-3 TECHNICAL OVERVIEW... 1-4 1.3.1 General Description ... 1-4 Data/Fax Modes... 1-4 Synchronous Access Mode (SAM) ... 1-4 World Class Operation... 1-4 Voice/TAM Mode ... 1-6 Telephony Extension Operation...
  • Page 4 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Programmable Inactivity Timer ... 2-3 DTE Signal Monitoring (Serial DTE Interface Only) ... 2-4 ERROR CORRECTION AND DATA COMPRESSION... 2-4 V.42 Error Correction ... 2-4 MNP 2-4 Error Correction ... 2-4 V.42 bis Data Compression ...
  • Page 5 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 4.2.9 THR - TX Buffer (Transmitter Holding Register) (Addr = 0, DLAB = 0)... 4-9 4.2.10 Divisor Registers (Addr = 0 and 1, DLAB = 1) ... 4-9 4.2.11 SCR - Scratch Register (Addr = 7)... 4-9 RECEIVER FIFO INTERRUPT OPERATION...
  • Page 6 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide List of Figures Figure 1-1. Block Diagram - Serial DTE Interface ... 1-5 Figure 1-2. Block Diagram - Parallel Host Interface ... 1-5 Figure 1-3. 1-Relay Data/Fax/TAM DAA Interface (U.S.) ... 1-10 Figure 1-4.
  • Page 7 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide List of Tables Table 1-1. Modem Models and Functions ... 1-2 Table 1-2. Modem Memory Options ... 1-9 Table 1-3. +VLS Command Options... 1-12 Table 2-1. +MS Command Automode Connectivity ... 2-2 Table 3-1.
  • Page 8 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide This page is intentionally blank. Conexant viii 1154...

  • Page 9: Introduction

    1. INTRODUCTION 1.1 SUMMARY The Conexant RC56D, RC336D, and RC144D Modem Device Set families support data/fax, voice/TAM/telephony extensions, V.80 synchronous access mode, host-DSVD, and optional speakerphone, AudioSpan, and on-board DSVD functions depending upon model (Table 1-1). The modem supports the following primary data modulations: ITU-T V.90/K56flex (RC56), V.34 (RC56 and RC336) and...

  • Page 10: Table 1-1. Modem Models And Functions

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Table 1-1. Modem Models and Functions Conexant 1154...

  • Page 11: Features

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 1.2 FEATURES Downloadable MCU firmware from the host/DTE and downloadable MDP code modules from the MCU Data modem ITU-T V.90 and K56flex (RC56 models) V.34 (33.6 kbps) (RC56 and RC336 models) V.32 bis, V.32, V.22 bis, V.22, V.23, and V.21...

  • Page 12: Technical Overview

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 1.3 TECHNICAL OVERVIEW 1.3.1 General Description The modem device set, consisting of separate microcontroller (MCU), modem data pump (MDP), optional Plug and Play (PnP) ISA Bus Interface Device, and optional RCDSVD Speech Codec Processor (SCP) devices, provides the processing core for a complete modem design.

  • Page 13: Figure 1-1. Block Diagram - Serial Dte Interface

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide SERIAL DTE/ INDICATOR INTERFACE MICRO CONTROLLER UNIT (MCU) [80-PIN PQFP] 256 x 8 SERIAL NVRAM (OPTIONAL) INTERFACE PARALLEL DEVICE HOST [11596-21: 80-PIN PQFP] INTERFACE (OPTIONAL) 256 x 8 SERIAL NVRAM (OPTIONAL)

  • Page 14: Voice/Tam Mode

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Voice/TAM Mode Voice/TAM Mode features include enhanced ADPCM compression/decompression, tone detection/generation and call discrimination, concurrent DTMF detection, and 8-bit monophonic audio data encoding. Voice/TAM Mode is supported by three submodes: Online Voice Command Mode supports connection to the telephone line or, for SP and SVD models, a handset.

  • Page 15: Host-Based Dsvd

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Host-Based DSVD All modem models support host-based ITU-T V.70 DSVD. The RCDSVD SCP (R6715) is not required. V.70 software drivers for Windows 95 are provided which support a speech/audio bit rate of significantly less than 8.0 kbps by implementing interoperable G.729 and G.729 Annex A with interoperable G.729 Annex B.

  • Page 16: Plug And Play (Pnp) Isa Bus Interface Device (Pnp Models)

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Plug and Play (PnP) ISA Bus Interface Device (PNP Models) The Conexant Plug and Play (PnP) ISA Bus Interface Device (11596-21) is an 80-pin PQFP VLSI device that supports automatic configuration of an Industry Standard Architecture (ISA) modem card operating on a personal computer (PC) with PnP capability.

  • Page 17: External Bus Interface

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide External Bus Interface The non-multiplexed external bus supports eight bidirectional data lines (D0-D7) and 18 address output lines (A0-A17). Read enable output (~READ), write enable output (~WRITE), and four chip select output (~ROMSEL, ~RAMSEL, ~DPSEL, and ~SCPSEL) lines are also supported.

  • Page 18: Figure 1-3. 1-Relay Data/Fax/Tam Daa Interface (U.s.)

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide ~EXTOH RINGD TXA1 TXA2 MODEM DEVICE SET MICM** MICV* * SP OR SVD MODELS. ** NON-(SP OR SVD) MODELS. Figure 1-3. 1-Relay Data/Fax/TAM DAA Interface (U.S.) 1-10 EXTENSION REMOTE HANG-UP SSI &...

  • Page 19: Figure 1-4. 2-Relay Data/Fax/Tam/V.61/Speakerphone Daa Interface (U.s.)

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide ~EXTOH RINGD ~VOICE TXA1 TXA2 TELOUT TELIN MODEM DEVICE SET (SP/SVD MODELS) MICV Figure 1-4. 2-Relay Data/Fax/TAM/V.61/Speakerphone DAA Interface (U.S.) 1154 EXTENSION PICKUP/ REMOTE HANG-UP SSI & HYBRD BRDGE SURG &...

  • Page 20: Table 1-3. +Vls Command Options

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Label Primitives None DCE on-hook. Local phone connected to the line. DCE off-hook. DCE connected to the line. Local phone provided with power to detect hook condition. DCE on-hook. Local phone connected to the DCE.

  • Page 21: Commands

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 1.3.5 Commands The modem supports data modem, fax class 1 modem, fax class 2 modem, voice/audio, full-duplex speakerphone (FDSP), MNP 10/MNP 10EC, AudioSpan, V.80, and DSVD commands, and S Registers in accordance with modem model options.
  • Page 22 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide This page is intentionally blank. Conexant 1-14 1154...

  • Page 23: Technical Specifications

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 2. TECHNICAL SPECIFICATIONS 2.1 SERIAL DTE INTERFACE OPERATION 2.1.1 Automatic Speed/Format Sensing Command Mode and Data Modem Mode. The modem can automatically determine the speed and format of the data sent from the DTE.

  • Page 24: Call Progress Tone Detection

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Call Progress Tone Detection Ringback, equipment busy, congested tone, warble tone, and progress tones can be detected in accordance with the applicable standard. Answer Tone Detection Answer tone can be detected over the frequency range of 2100 ± 40 Hz in ITU-T modes and 2225 ± 40 Hz in Bell modes.

  • Page 25: Data Mode

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 2.4 DATA MODE Data mode exists when a telephone line connection has been established between modems and all handshaking has been completed. Speed Buffering (Normal Mode) Speed buffering allows a DTE to send data to, and receive data from, a modem at a speed different than the line speed. The modem supports speed buffering at all line speeds.

  • Page 26: Dte Signal Monitoring (Serial Dte Interface Only)

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide DTE Signal Monitoring (Serial DTE Interface Only) ~DTR. When ~DTR is asserted, the modem responds in accordance with the &Dn and &Qn commands. ~RTS. ~RTS is used for flow control if enabled by the &K command in normal or error-correction mode.

  • Page 27: Fax Class 1 And Fax Class 2 Operation

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 2.8 FAX CLASS 1 AND FAX CLASS 2 OPERATION Facsimile functions operate in response to fax class 1 commands when +FCLASS=1, and in response to fax class 2 commands when +FCLASS=2.

  • Page 28: Sound Card Support Modes

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 2.9.7 Sound Card Support Modes Mute Handset; Route Sound Chips Output To Line. This mode mutes the local handset and routes the sound chip output (such as music or messages during telephone hold) by switching the handset out of the telephone line path if necessary.

  • Page 29: Host-Based Dsvd Mode

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 2.12 HOST-BASED DSVD MODE Host-based DSVD operation is enabled by the +H17&K3 commands. In Host-based DSVD Mode, the host PC is typically connected to a microphone/speaker arrangement using a sound card.

  • Page 30: Answer Tone Detection

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 2.15.5 Answer Tone Detection The answer tone detection period is programmable by ConfigurACE II for Windows. 2.15.6 Blacklist Parameters The modem can operate in accordance with requirements of individual countries to prevent misuse of the network by limiting repeated calls to the same number when previous call attempts have failed.

  • Page 31: Hardware Interface

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 3. HARDWARE INTERFACE 3.1 HARDWARE SIGNALS The modem hardware interface signals for the serial DTE interface configuration are shown in Figure 3-1. The modem hardware interface signals for the parallel host interface configuration are shown in Figure 3-2.

  • Page 32: Figure 3-1. Hardware Interface Signals - Serial Dte Interface

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide ~XTCLK ~TXCLK ~RXCLK* ~ TXD ~ RXD ~ CTS ~ DSR ~ RLSD SERIAL/ INDICATOR ~ TM INTERFACE ~ RI ~DRSOUT ~ DTR ~ RTS ~ RDL ~ AL MICRO CONTROLLER...

  • Page 33: Figure 3-2. Hardware Interface Signals - Parallel Host Interface

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide HD0-HD7 HA0-HA2 ~HCS PARALLEL HOST ~HWT INTERFACE ~HRD HINT ~RES MICRO CONTROLLER UNIT ~RESET (MCU) PARIF NVMDATA NVRAM NVMCLK (OPTIONAL) XTLI MODEM CRYSTAL XTLO CIRCUIT VCC (+5V) DGND Figure 3-2. Hardware Interface Signals - Parallel Host Interface...

  • Page 34: Figure 3-3. Mcu Pin Signals - Serial Dte Interface - 80-Pin Pqfp

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Figure 3-3. MCU Pin Signals - Serial DTE Interface - 80-Pin PQFP Figure 3-4. MCU Pin Signals - Parallel Host Interface - 80-Pin PQFP ~RES ~NMI ~WRITE ~READ ~RLY3 ~RLY4 XTLI XTLO VD3.3...

  • Page 35: Table 3-1. Mcu Pin Signals - Serial Dte Interface - 80-Pin Pqfp

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Table 3-1. MCU Pin Signals - Serial DTE Interface - 80-Pin PQFP Signal Label I/O Type ~RES ~NMI Is2pu ~WRITE Ot1.6 ~READ Ot1.6 (PE2) ~RLY3 Ot1.6 (PE3) ~RLY4 Ot1.6 Itpd XTLI XTLO VD3.3...

  • Page 36: Table 3-2. Mcu Pin Signals- Parallel Host Interface - 80-Pin Pqfp

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Table 3-2. MCU Pin Signals- Parallel Host Interface - 80-Pin PQFP Signal Label Type ~RES ~NMI Is2pu ~WRITE Ot1.6 ~READ Ot1.6 (PE2) ~RLY3 Ot1.6 (PE3) ~RLY4 Ot1.6 Itpd XTLI XTLO VD3.3...

  • Page 37: Figure 3-5. Mdp Pin Signals - 100-Pin Pqfp

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide MD212F5 PO-R6764-100P * NC on non-SP models. Figure 3-5. MDP Pin Signals - 100-Pin PQFP Conexant 1154...

  • Page 38: Table 3-3. Mdp Pin Signals - 100-Pin Pqfp

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Signal Label I/O Type RESERVED ~WRITE ~READ ~RDCLK ~WKRES SR2CLK ~RLSD TDCLK RESERVED RESERVED ~RES1 SR4OUT SR3OUT SR4IN SR3IN CLKOUT SA1CLK IA1CLK AGND TELIN/NC* I(DA) TELOUT/NC* O(DD) AVAA O(DF) TXA1 O(DD)

  • Page 39: Figure 3-6. Rcdsvd Scp Pin Signals- 100-Pin Pqfp

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 1087F2-4 RCDSVD 100Q Figure 3-6. RCDSVD SCP Pin Signals- 100-Pin PQFP Conexant 1154...

  • Page 40: Table 3-4. Rcdsvd Scp Pin Signals - 100-Pin Pqfp

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Table 3-4. RCDSVD SCP Pin Signals - 100-Pin PQFP Signal Label I/O Type IA/OB IA/OB IA/OB IA/OB IA/OB IA/OB IA/OB IA/OB ~WRITE ADVSS VREF RBIAS MICIN I(DA) AVSS LINEIN I(DA) AVDD...

  • Page 41: Table 3-5. Mcu Pin Signal Definitions

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Label I/O Type XTLI, MCU Crystal/Clock In and Crystal Out. Connect XTLI and XTLO to an external 28.224 MHz crystal XTLO circuit. CLKOUT Ot1.6 Clock Output. 28.224 MHz output clock for MDP. Connect to MDP CLKIN pin.
  • Page 42 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Label I/O Type ~RLY1 (~OH) Relay 1 Control (~OH). The active low ~RLY1 output can be used to control the normally open off-hook (PE0) relay. The ~PULSE function is also provided on this line in addition to the ~OH function for single ~OH/~PULSE relay application.
  • Page 43 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Label I/O Type V.24 (EIA/TIA-232-E) DTE SERIAL INTERFACE (SERIAL DTE INTERFACE CONFIGURATION) These signals correspond functionally to V.24/EIA/TIA-232-E signals with TTL levels and are inverted from V.24/EIA/TIA-232-E levels. ~TXD (PA2) Transmitted Data (EIA BA/ITU-T CT103). The DTE uses the ~TXD line to send data to the modem for transmission over the telephone line or to transmit commands to the modem.

  • Page 44: Table 3-6. Mdp Pin Signal Definitions

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Label I/O Type ~RES1, Reset. ~RESET (~RES1 and ~RES2) low holds the MDP in the reset state. ~RESET going high releases ~RES2 the MDP from the reset state and initiates normal operation using power turn-on (default) values. ~RESET must be held low for at least 3 µs.
  • Page 45 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Label I/O Type TELEPHONE LINE/TELEPHONE/AUDIO INTERFACE SIGNALS AND REFERENCE VOLTAGE TXA1, TXA2 O(DF) Transmit Analog 1 and 2. The TXA1 and TXA2 outputs are differential outputs 180 degrees out of phase with each other. Each output can drive a 300 the telephone line interface or an optional external hybrid circuit.
  • Page 46 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Label I/O Type GP00 MDP: ~RDCLK. SLEEPO MDP: IASLEEP. IASLEEP MDP: SLEEPO. MSCLK MDP: IA1CLK. CLKOUT MDP: MCLKIN & VCLKIN. SR1IO MDP: MCNTRLSIN. SR3IN MDP: VRXOUT. IA1CLK MDP: MSCLK. SA1CLK MDP: MSTROBE.

  • Page 47: Table 3-7. Rcdsvd Scp Pin Signal Definitions

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Label I/O Type XTLI, XTLO R, R Crystal In and Crystal Out. Connect to an external 56.448 MHz fundamental or third overtone crystal circuit, oscillator circuit, or the MDP XCLK pin..
  • Page 48 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Table 3-7. RCDSVD SCP Pin Signal Definitions (Cont’d) Label I/O Type SR1IO Connect to SCP: CTRLSIN. CTRLSIN Connect to SCP: SR1IO. SR3IN Connect to SCP: SOUT. SOUT Connect to SCP: SR3IN.

  • Page 49: Table 3-8. Mcu Digital Electrical Characteristics

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Type and Parameter Input TTL compatible Input High Voltage Input Low Voltage Input Leakage Current (PD4-PD7) Itpd With internal pulldown Itpu With internal pullup Input Special (~RES) Input High Voltage Input Low Voltage...

  • Page 50: Table 3-9. Mdp Digital Electrical Characteristics

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Parameter Symbol Input High Voltage V IH Type IA Input High Current I IH Input Low Voltage V IL Input Low Current I IL Input Leakage Current I IN Output High Voltage...

  • Page 51: Table 3-10. Analog Electrical Characteristics

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Name Type RIN, I (DA) Input Impedance TELIN AC Input Voltage Range MICM, MICV Reference Voltage TXA1, TXA2 O (DD) Minimum Load TELOUT Maximum Capacitive Load Output Impedance AC Output Voltage Range...

  • Page 52: Table 3-11. Current And Power Requirements

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Typical Current Mode MCU (L28) Normal mode Sleep mode MDP (R6764) Normal mode Sleep mode Total Modem (MCU and MDP) Normal mode Sleep Optional PnP Device (11596-21) Normal mode Optional RCDSVD SCP...

  • Page 53: Interface Timing And Waveforms

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 3.2 INTERFACE TIMING AND WAVEFORMS 3.2.1 External Memory Bus Timing The external memory bus timing is listed in Table 3-13 and illustrated in Figure 3-7. Symbol t FI Internal Operating Frequency...

  • Page 54: Figure 3-7. Waveforms - External Memory Bus

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide A0 - A16 ~ES** ~READ D0-D7 * C2 = Internal Phase 2 clock. ** ~ES = ~RAMSEL, ~ROMSEL, or ~SVDCS. A0 - A16 ~ES** ~WRITE D0-D7 * C2 = Internal Phase 2 clock.

  • Page 55: Parallel Host Bus Timing

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 3.2.2 Parallel Host Bus Timing The parallel host bus timing is listed in Table 3-14 and illustrated in Figure 3-8. Symbol READ (See Notes 1, 2, 3, 4, 5, and 6)

  • Page 56: Figure 3-8. Waveforms - Parallel Host Bus

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide HA0-HA2 ~HCS ~HRD ~HWT HD0-HD7 HA0-HA2 ~HCS ~HRD ~HWT HD0-HD7 3-26 t AS t CS t RD t DD a. Host Read t AS t AH t CS t WT t DS b.

  • Page 57: Serial Dte Interface

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 3.2.3 Serial DTE Interface The serial DTE interface waveforms for 4800 and 9600 bps are illustrated in Figure 3-9. TDCLK 4800 BPS 4800 BPS TDCLK 9600 BPS 9600 BPS NOTE: THIS FIGURE IS VALID FOR SYNCHRONOUS MODE ONLY. THERE IS NO RELATIONSHIP BETWEEN NOTE: TXD AND TDCLK IN ASYNCHRONOUS MODE.
  • Page 58 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide This page is intentionally blank. Conexant 3-28 1154...

  • Page 59: Parallel Host Interface

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 4. PARALLEL HOST INTERFACE The modem supports a 16550A interface in parallel interface versions. The 16550A interface can operate in FIFO mode or non-FIFO mode. Non-FIFO mode is the same as 16450 interface operation. FIFO mode unique operations are identified.

  • Page 60: Table 4-1. Parallel Interface Registers

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Register Register Name Scratch Register (SCR) Modem Status Register (MSR) Line Status Register (LSR) RX FIFO Modem Control Register (MCR) Line Control Register (LCR) Interrupt Identify Register (IIR) (Read Only) FIFO Control Register...

  • Page 61: Register Signal Definitions

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 4.2 REGISTER SIGNAL DEFINITIONS 4.2.1 IER - Interrupt Enable Register (Addr = 1, DLAB = 0) The IER enables five types of interrupts that can separately assert the HINT output signal (Table 4-2). A selected interrupt can be enabled by setting the corresponding enable bit to a 1, or disabled by setting the corresponding enable bit to a 0.

  • Page 62: Fcr - Fifo Control Register (Addr = 2, Write Only)

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 4.2.2 FCR - FIFO Control Register (Addr = 2, Write Only) The FCR is a write-only register used to enable FIFO mode, clear the RX FIFO and TX FIFO, enable DMA mode, and set the RX FIFO trigger level.

  • Page 63: Iir - Interrupt Identifier Register (Addr = 2)

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 4.2.3 IIR - Interrupt Identifier Register (Addr = 2) The Interrupt Identifier Register (IIR) identifies the existence and type of up to five prioritized pending interrupts. Four priority levels are set to assist interrupt processing in the host. The four levels, in order of decreasing priority, are: Highest: Receiver Line Status, 2: Receiver Data Available or Receiver Character Timeout, 3: TX Buffer Empty, and 4: Modem Status.

  • Page 64: Lcr - Line Control Register (Addr = 3)

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 4.2.4 LCR - Line Control Register (Addr = 3) The Line Control Register (LCR) specifies the format of the asynchronous data communications exchange. Bit 7 Divisor Latch Access Bit (DLAB). This bit must be set to a 1 to access the Divisor latch registers during a read or write operation. It must be reset to a 0 to access the Receiver Buffer, the Transmitter Buffer, or the Interrupt Enable Register.

  • Page 65: Mcr - Modem Control Register (Addr = 4)

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 4.2.5 MCR - Modem Control Register (Addr = 4) The Modem Control Register (MCR) controls the interface with the modem or data set. Bit 7-5 Not used. Always 0. Bit 4 Local Loopback.

  • Page 66: Lsr - Line Status Register (Addr = 5)

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 4.2.6 LSR - Line Status Register (Addr = 5) This 8-bit register provides status information to the host concerning data transfer. Bit 7 RX FIFO Error. In the 16450 mode, this bit is not used and is always 0.

  • Page 67: Msr - Modem Status Register (Addr = 6)

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 4.2.7 MSR - Modem Status Register (Addr = 6) The Modem Status Register (MSR) reports current state and change information of the modem. Bits 4-7 supply current state and bits 0-3 supply change information. The change bits are set to a 1 whenever a control input from the modem changes state from the last MSR read by the host.

  • Page 68: Receiver Fifo Interrupt Operation

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Divisor Latch (Hex) Note: Values correspond to a UART input frequency of 1.8432 MHz. 4.3 RECEIVER FIFO INTERRUPT OPERATION 4.3.1 Receiver Data Available Interrupt When the FIFO mode is enabled (FCR0 = 1) and receiver interrupt (RX Data Available) is enabled (IER0 = 1), receiver interrupt operation is as follows: The Receiver Data Available Flag (LSR0) is set as soon as a received data character is available in the RX FIFO.

  • Page 69: Design Considerations

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 5. DESIGN CONSIDERATIONS Good engineering practices must be followed when designing a printed circuit board (PCB) containing the modem device. This is especially important considering the high data bit rate, high fax rate, record/play of analog speech and music audio, and full-duplex speakerphone operation.

  • Page 70: Signal Routing

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide and status signals routed through it. A DAA section is also governed by local government regulations covering subjects such as component spacing, high voltage suppression, and current limiting. Once sections have been roughly defined, place the components starting with the connectors and jacks.

  • Page 71: Board Power Traces

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Keep analog signal (e.g., TXA1, TXA2, RIN, TELIN, TELOUT, MICM, MICV, and SPK) traces at least 10 mil thick (preferably 12 - 15 mil). Keep all other signal traces as wide as possible, at least 5 mil (preferably 10 mil). Route the signals between components by the shortest possible path (the components should have been previously placed to allow this).

  • Page 72: Crystal Circuit

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide modem DGND pins to the digital ground plane area and AGND pins to the analog ground plane area. Typically, separate the collective digital ground plane area from the collective analog ground plane area by a fairly straight gap. There should be no inroads of digital ground plane area extending into the analog ground plane area or visa versa.

  • Page 73: Telephone And Local Handset Interface

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Route the connection from the negative terminal of 10 F VREF capacitor and the other terminal of the 0.1 F VREF capacitor to the MDP VC pin with a single trace isolated from the trace to the VC pin from the VC ferrite bead. (see Step c).

  • Page 74: Table 5-4. Mcu, Mdp And Scp Pin Noise Characteristics

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Table 5-4. MCU, MDP and SCP Pin Noise Characteristics Device Function VDD and GND 80-Pin PQFP Crystal Control (Serial External Memory Bus Interface) NVRAM MDP Interface Line Interface Serial/LED Interface No Connection (NC)

  • Page 75: Crystal/Oscillator Specifications

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 5.3 CRYSTAL/OSCILLATOR SPECIFICATIONS Recommended surface-mount crystal specifications are listed in Table 5-5. Recommended through-hole crystal specifications are listed in Table 5-6. Recommended surface-mount clock oscillator specifications are listed in Table 5-7.

  • Page 76: Table 5-6. Crystal Specifications - Through Hole

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Characteristic Conexant Part No. Electrical Frequency Frequency Tolerance Frequency Stability vs. Temperature vs. Aging Oscillation Mode Calibration Mode Load Capacitance, C L Shunt Capacitance, C O Series Resistance, R 1 Drive Level...

  • Page 77: Table 5-7. Clock Oscillator Specifications - Surface Mount

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Table 5-7. Clock Oscillator Specifications - Surface Mount Characteristic Conexant Part No. Electrical Output Frequency Frequency Stability (1) Symmetry Output Voltage Rise/Fall Time (2) Driving Ability Start up Time Tri -State...

  • Page 78: Table 5-8. Clock Oscillator Specifications - Through Hole

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide Table 5-8. Clock Oscillator Specifications - Through Hole Characteristic Conexant Part No. Electrical Output Frequency Frequency Stability (1) Symmetry Output Voltage Rise/Fall Time (2) Driving Ability Start up Time Tri-State Output Active...

  • Page 79: Schematics

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 5.4 SCHEMATICS A typical interface schematic for the MCU packaged in an 80-pin PQFP with serial DTE interface is shown in Figure 5-1. A typical interface schematic for the MCU packaged in an 80-pin PQFP with parallel host interface is shown in Figure 5-2.

  • Page 80: Figure 5-1. Interface Schematic - Mcu With Serial Dte Interface - 80-Pin Pqfp

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide SERIAL INTERFACE INDICATOR INTERFACE RESET CIRCUIT * Pin 36 cannot be used for ~SCPIRQ function if connected for ~RXCLK support. ** Pin 36 cannot be used for ~RXCLK function if connected for ~SCPIRQ support.

  • Page 81: Figure 5-2. Interface Schematic - Mcu With Parallel Host Interface - 80-Pin Pqfp

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide HOST PARALLEL INTERFACE Figure 5-2. Interface Schematic - MCU with Parallel Host Interface - 80-Pin PQFP 1154 80-PIN PQFP XTLI 33 pF 28.224 MHz XTLO 33 pF PARIF ~STPMODE ~NMI ~TST...

  • Page 82: Figure 5-3. Interface Schematic - Mdp - 100-Pin Pqfp

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide DSVD CLK EXTERNAL MCU: DPIRQ MCU: ~WKRESOUT MCU: ~RESET SERIAL INTERFACE PIF: NC SIF: MCU: ~DPRXD (PA5) MCU: VD3.3 PROVIDE DIRECT CONNECTION OR FERRITE BEAD BETWEEN GND AND AGND, WHICHEVER ACHIEVES LOWEST NOISE FLOOR.

  • Page 83: Figure 5-4. Interface Schematic - Rcdsvd Scp - 100-Pin Pqfp

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 10µH MCU: EXTERNAL MCU: ~SCPCS MCU: ~SCPIRQ MCU: ~WKRESOUT Figure 5-4. Interface Schematic - RCDSVD SCP - 100-Pin PQFP 1154 XTLI 56.448 MHz ADVDD XTLO SPKN SPKP MICIN ADVSS LINEOUT ADVSS...
  • Page 84 RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide This page is intentionally blank. Conexant 5-16 1154...

  • Page 85: Package Dimensions

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide 6. PACKAGE DIMENSIONS The package dimensions are shown in Figure 6-1 (80-pin PQFP) and Figure 6-2 (100-pin PQFP). CHAM (4X) PIN 1 1154 TOP VIEW DETAIL A Figure 6-1. Package Dimensions - 80-Pin PQFP...

  • Page 86: Figure 6-2. Package Dimensions - 100-Pin Pqfp

    RC56D, RC336D, and RC144D Modem Device Sets Designer’s Guide CHAM (4X) PIN 1 DETAIL A TOP VIEW Figure 6-2. Package Dimensions - 100-Pin PQFP Conexant See detail A SIDE VIEW Millimeters Inches* Dim. Min. Max. Min. Max. 2.4 MAX 0.0945 MAX 0.05...
  • Page 87 INSIDE BACK COVER NOTES...
  • Page 88 Further Information literature@conexant.com 1-800-854-8099 (North America) 33-14-906-3980 (International) Web Site www.conexant.com World Headquarters Conexant Systems, Inc. 4311 Jamboree Road P. O. Box C Newport Beach, CA 92658-8902 Phone: (949) 483-4600 Fax: (949) 483-6375 U.S. Florida/South America Phone: (813) 799-8406 Fax: (813) 799-8306 U.S.

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