Related Manuals for Oki MSM7731-02
Summary of Contents for Oki MSM7731-02
- Page 1 FEBL7731-02-02 User’s Manual MSM7731-02 Evaluation Board Oki Electric Industry Co., Ltd. Ver. 2.0 February 2000...
- Page 2 Oki assumes no responsibility or liability whatsoever for any failure or unusual or unexpected operation resulting from misuse, neglect, improper installation, repair, alteration or accident, improper handling, or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the specified operating range.
- Page 3 FEBL7731-02-02 CONTENTS MSM7731-02 EVALUATION KIT...................... 1 1. GENERAL DESCRIPTIONS ......................1 LSI Socket and MSM7731-02GA LSI ......................1 Speaker Amplifier LSI (LM4861 manufactured by National Semiconductor)..........1 Microphone Input Circuit..........................1 Single 12 V Power Supply Pin and Ground Pin (TP1 and TP2) ..............1 Various Test Pins ............................
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Page 4: Table Of Contents
FEBL7731-02-02 Jumper (JP) ..............................5 External Oscillator (XL2)..........................6 Extra Amplifier Setting ..........................6 4. HOW TO SET THE OPERATION MODE .................. 8 Pin Control Mode............................8 MCU Interface Mode Using On-board Registers ..................8 MCU Interface Mode Using External Microcontroller ................9 How to Write the Control Register by Using Toggle Switches .............. - Page 5 Various DIP Switches DIP switches are mounted on the PCB for the evaluation of the Pin Control Mode of the MSM7731-02. Various Toggle Switches Toggle switches are mounted on the PCB for the evaluation of the MCU Interface Mode of the MSM7731-02.
- Page 6 1.14 Measurement Location for External Oscilloscope During the tuning process, some of the output pins of the MSM7731-02 have to be measured by using an external oscilloscope. There are 6 points where the pins of the oscilloscope have to be set.
- Page 7 3.2.2 DSW2 DSW2 located at the upper middle of the evaluation board consists of switches for mode selection. Refer to “Table 2-1: DIP Switch Settings or the “Pin Functional Description” of the MSM7731-02 Data Sheet for details. When evaluating the microcontroller or on-board register, set the switches other than switches No.
- Page 8 This is a switch to select the read and write mode of control registers. Set SW18 to “W” to write the address and register contents into the MSM7731-02 which is set by the toggle switches of SW2 to SW9 (D7 to D0) and SW14 to SW17 (A3 to A0). Set SW18 to “R” to read the written data of the address and register contents out of the MSM7731-02.
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Page 9: Jumper (Jp)
3.4.2 J2 (MIN) MIN is a jack for line side analog voice input. The jack is connected to LIN of the MSM7731-02 and MIN pin of TP5 on this evaluation board. For the detailed schematic between MIN and LIN, refer to Figure 3-1 of this user’s manual. -
Page 10: External Oscillator (Xl2)
8 is to a single +5 V power supply. Other pins of U15 are open and can be connected by using a jumper line at your disposal. Table 2-1 DIP Switch Settings Refer to the “Pin Functional Description” of the MSM7731-02 data sheet for detailed explanation. SW Name Parameter Name Set to “1”... - Page 11 FEBL7731-02-02 User’s Manual for 1 Semiconductor MSM7731-02 Evaluation Board Table 2-2 Noise Cancellation Level Select NCSEL2 NCSEL1 Noise Cancellation Level 17 dB 13.5 dB 8 dB 0 dB Table 2-3 Noise Cancellation Input/Output Gain Adjustment NCPAD2 NCPAD1 GPADNC Gain LPADNC Gain...
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Page 12: How To Set The Operation Mode
MSM7731-02 Evaluation Board HOW TO SET THE OPERATION MODE There are two modes for controlling the MSM7731-02; the pin control mode that controls the device through pin settings, the MCU interface mode that controls the device through control register settings. Not only you can simulate both modes by various switches on this evaluation board but also you can connect an external microcontroller, which could serve as easy-to-use microcontroller software development environment. -
Page 13: Mcu Interface Mode Using External Microcontroller
1 Semiconductor MSM7731-02 Evaluation Board The MSM7731-02 can change the initial values of cancellable echo delay time, noise attenuation, and attenuation of ATT function using the CR. See Sections 4-6 and 4-7 or “Method of Internal Memory Access” of the MSM7731-02 Data Sheet for reference. The MSM7731-02 enters the normal operation mode after CR0 has been set. - Page 14 FEBL7731-02-02 User’s Manual for 1 Semiconductor MSM7731-02 Evaluation Board Table 3 Mode Settings MCU Mode Component Name Pin Control Mode On-board Register External MCU Connect the DC 12 V power supply Connect to GND Used in digital interface mode only...
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Page 15: How To Write The Control Register By Using Toggle Switches
ATT function) by toggle switches, refer to the “Method of Internal Data Memory Access” of the MSM7731-02 Data Sheet. The written data in the CR (control register) will remain unchanged till the SW1 (PDNRST) is pressed or new data is overwritten. -
Page 16: Dual Ec Mode (Acoustic And Line Echo Cancellation Mode)
MCU mode using the on-board register in the initial mode. When changing the default value, set the NCSEL1 and NCSEL2 pins to “0”. For detailed explanation, refer to the “Method of Internal Data Memory Access” of the MSM7731-02 Data Sheet. - 12 -... -
Page 17: How To Set Noise Canceler Pads (Ncpad1, Ncpad2)
Even with the same noise cancellation level, the voice quality differs depending on the 2 parameter values. Try and find your best combination. The combinations marked with a double line are Oki’s recommendations. Address of default value (Address 1): 01C8h Address of default value (Address 2): 01C2h Refer to Table 6-2 for the setting data of the noise cancellation level. -
Page 18: How To Control The Evaluation Board For Best Quality Voice
MSM7731-02 can realize the best quality voice. In order to get the best quality voice, it is required to control the peripheral circuits for the MSM7731-02. This chapter describes how to get the best quality voice using the MSM7731-02 evaluation board. The following control method for the MSM7731-02 is described when the EC mode is the single EC mode and the line interface is the analog interface. - Page 19 FEBL7731-02-02 User’s Manual for 1 Semiconductor MSM7731-02 Evaluation Board (c) Set each switch of DSW3 as follows: 1 - SLPHR: Set this switch to “1” to disable the slope filter. 2 - NCSEL1: Set this switch to “1” to disable the noise canceler.
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Page 20: Step 4
FEBL7731-02-02 User’s Manual for 1 Semiconductor MSM7731-02 Evaluation Board Perform the level control so as to satisfy the following conditional expression. <Conditional expression> AVFRO output level + 4 dB ≥ AGSX input level of echo canceler (See the AVFRO and AGSX locations of Figure 1 Board Schematic) -
Page 21: Precautions
(1) The clock outputs (SYNC, BCLK) are disabled during the power down/reset mode. Since the on-board MCU control circuit is activated by the clock signal of the MSM7731-02, it is required to release the power down/reset mode using SW1 (PDNRST) if the power down/reset mode has been set using CR (CR0-B7). -
Page 22: Circuit Diagrams
+12V GND DSW1 DSW2 Power Supply DSW6 Digital Interface Pin 8 of LM4861 Jumper AVFRO DOUT TP4 Select PCM/Linear Select TEST Mode Selection EXCK On-board Speaker Amplifier Interface CX15 Additional Reset On-board Register Control Amplifier Area Noise Canceler, D7 D6 D5 D4 D3 D2 D1 D0 PDNRST Crystal Parts Optional Socket for OSC... - Page 23 R1, R3 R2, R4 R6, RA9 to pin 1 µF 10 µF 1µF PCMEI LED1 to 9 PCMEI PCMI PCMI AOUT AOUT DSW2 CLKSEL APWI APWI BCLK AVFRO AVFRO BCLK SB1 slide-type switch SYNC SYNC SW10 AGSX AGSX PDN/RST MSM7731 AVDD to pin DSW1...
- Page 24 DSW6 EXCK 74HC04 74HC00 74HC74 BCLK CLR1 10 µF 2.2k CLR2 CLK1 CLK2 LGSX DSW6 1 µF LVFRO LPWI 74HC161 74HC02 74HC74 74HC74 MOUT CLR1 CLR1 LOUT CLR2 CLR2 CLK1 CLK1 CLK2 CLK2 MOUT 1.2k Figure 3-1 MIN-LIN and MOUT-LOUT 74HC165 74HC165 74HC164...