Panasonic KX-TDA600BX Service Manual page 35

• • • • ASIC block
Configuration: IC102 (ASIC), IC111, X103 and so on.
Function:
(IC102) This functions as the bus master of EC bus (synchronous bus with 16 bit width, transmission rate max.10Mbps).
Communicates with ASIC mounted to each option card via EC bus and controls the option card.
Controls CT bus (HW clock 8.192MHz, 8 highway, 128 timeslot) for TSW function.
Controls the conference call for 3 people x ~8 parties ~ 8 people x ~3 parties.
Generates single and DTMF tone in any highway and timeslot.
Provides the digital gain control function by data conversion.
Provides some I/O ports for CODEC channel pulse generation, modem encoding rule setting and music on-hold switching
and is controlled by CPU.
• • • • Memory block
Configuration: IC621, IC622 (SRAM), IC503 (Flash ROM), IC505, IC506 (SDRAM), IC509, IC511 (logic IC) and so on.
Function:
(IC621, IC622) Saves the user configuration data (such as key assign data per PT).
The memory is maintained by the onboard battery back-up.
(IC503) Saves (some of) the system boot program and the system data.
(IC505, IC506) The main program is loaded from the SD card on the system start-up.
Used as the program area and the CPU work area after start-up.
Makes a direct bus connection to CPU due to high-speed action (bus clock 66MHz).
(IC509, IC511) Generates each memory select signal from the memory area select signal and upper address. Generates
the write signal and upper/lower byte select signal.
• • • • USB block
Configuration:
IC404 (USB I/F), X401 (source clock: 12.000MHz), CN404 (USB connector) and so on.
Function:
Connects to the USB host system (mainly PC) via CN404 (B type connector) as a USB device and makes data transfer by
max.11Mbps. DMA function of CPU is utilized to transfer the data.
• • • • SD card block
Configuration:
IC405 (SD card I/F), IC409, X402(20MHz), CN403 (SD card connector) and so on.
Function:
Loads the main program and the system data from the SD card connected to CN403 by 10Mbps. Restores the system data
periodically.
• • • • MOH/PAGING block
Configuration:
IC605, IC606 (CODEC), IC608, IC609 (OP Amp), IC610 (Melody IC), Q603~Q607 (transistor), JK601~JK604 (pin jack) and
so on.
Function:
The external music on-hold 1 is input from JK604 and is A/D converted in IC605 via AGC (Auto Gain Control) circuit, which
consists of IC608, Q605, Q607 and other CR, this is then connected to the call line HW. Likewise, the external music on-
hold 2 is input from JK603 and is made A/D conversion in IC606 via AGC (Auto Gain Control) circuit, which consists of
IC609, Q606, Q608 and other CR, this is then connected to the call line HW. The external music on-hold 2 and IC610 is
exclusively connected to IC606 input (by software control).
The various tones & DTMF tone and the voice data generated in IC102 (ASIC) are made D/A conversion in IC605 and
IC606. They are output via JK602, JK601 respectively.
• • • • Power Supply block
Configuration:
IC602 (DC/DC converter), IC625 (1.5V regulator), IC611 (Comparator), Q601, Q610, Q611 (transistor, FET), L601, L603,
C600, C643, C641, C642, D602, D605, D607~D609, BAT600, IP601, IP602 (circuit protection device) and so on.
Function:
+15V input is stepped down to +3.3V by DC/DC converter circuit which consists of IC602, L601, Q611, C600 and C643, and
is supplied to each IC power. And, it monitors +3.3V output voltage and turns ON Q611 to block +15V input when over
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KX-TDA600BX