KX-TDE0101RU (serv.man2) - Panasonic PBX Service Manual (repair manual). Page 11

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• CPU2 block (BLOCK1) 

This block operates the main unit control. Besides this operates various controls, select signal generation, DMA control and
serial port control. This contains the built-in clock function.
Configuration: IC101 (CPU), IC102 (clock buffer for PCI), and so on.
Function:
(IC101) Generates the select signal in accordance with the memory map and operates Readout/Storage of data between each
peripheral.
Controls the DMA transfer between built-in serial controller and memory.
Operates input/output control of each I/O signal in accordance with the program.

• CPU_POWER block (BLOCK2)

This block is a power supply part of CPU.
Configuration: IC101 (CPU), X501 (33.33MHz clock for CPU), and so on.
Function:
Power pins of CPU.(+3.3VD,+2.5VD,+1.25VD)
Clock oscillation circuit for CPU operation.

• MEMORY2 block (BLOCK3)

This is a work area and the main unit control program storage or the system boot program storage area.
Configuration: IC602 (Flash ROM), IC601, IC603 (DDR-SDRAM), CN601 (IPCMEC card connector) and so on.
Function:
(IC602) Saves (some of) the system boot program and the system data.
(IC601, IC603) 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.
It is independent bus connection to CPU due to high-speed action (bus clock 166MHz).

• FPGA + RTC + SVM block (BLOCK 4)

The FPGA is a CPU Peripheral function IC.
Configuration: IC801 (FPGA), IC802 (RTC, 32.768kHz clock for CPU), IC804 ( SVM DSP ), IC805 ( SVM voice data FLASH )
and so on.
Function:
(IC801) has the functions of RTC I/F, LAN SW I/F(SPI I/F), reset control port, LED driver and address decoder and so on.
(IC802)This is working in the Real time clock function when system stops.
This IC is maintained by the onboard battery back-up.
(IC804,IC805) These are the simple voice mail function.

• LAN block (BLOCK 5)

It is LAN controller connected with PCI.
Configuration: IC1002 (MAC+PHY (LAN controller)), X1001 ( 25MHz clock for LAN controller) and so on.
Function:
(IC1002) This is a function to communicate LAN through LAN SW.

• LAN_SW_5P block (BLOCK 6)

5ports LAN SW and the external I/F LAN connector. 
Configuration: IC1101 (LAN SW), JK1102, JK1103 (LAN connector) and so on.
Function:
(IC1101) It is a hub that does LAN signal of two internal ports and two external ports in the switching.
(JK1102, JK1103) These are connectors with built-in LAN transformer and LED.

• SD and RS232 block (BLOCK 7)

SD card I/F and RS232 (serial) I/F
Configuration: IC1201 (SD card controller), CN1201 (SD card connector) , IC1202 (RS232 D/R)and so on.
Function:
(IC1201) This provides the SD card I/F function and loads the main unit program and the system data from the SD card storing
the main unit control program.
(IC1202). This provides the serial I/F driver / receiver function.