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This block is capable of controlling the EC bus, which is a way of accessing the option card.
It also realizes TSW function by controlling the CT bus (8.192MHz HW clock; 8 highways, 128 timeslots). At the same time, it is
capable of controlling conference call with a range of 3 parties of 10 to 8 parties of 4.
It also generates single or DTMF tones in any highway or time slot. 

The CPU block consists of IC200 (CPU), X201 (Clock for timer), IC202 (spread clock).
IC200 is the CPU that controls the expansion shelf, X201 is the clock that the CPU uses internally, and IC202 is a driver to trans-
mit the CPU operating clock from the ASIC block.

This block consists of IC301, 302 (SDRAM), IC303 (flash ROM), IC304 (SRAM), as well as the following to separate the main
and local buses: IC305, IC306, IC307, IC308, IC309, IC310, IC311, IC313 (Logic IC).
In flash memory are stored the boot and operating programs.
SDRAM is the region in which the operating program is actually expanded and run.
SRAM is the region in which an error log is temporarily stored during operation.
Access to ICs and all RAM aside from SDRAM is done through the separated local bus.

This block consists of IC401 (Controller), X401 (source clock 40MHz), and IC410. 
Through message communication among controllers within the BUS-M card mounted in the basic shelf, packet communication
with EMPR of the basic shelf is made possible.
LVDS is used for actual communication.
IC402 serves an auxiliary role when the CPU accesses other ICs.

This block consists of IC501 (TSW). 
It is capable of exchanging voice data between the CT bus (1024ch) within the unit and the voice bus (384ch) of the basic shelf.

This block consists of IC601, 602, 603, 604, 605 (LVDS) and CN601 (BUS Cable Connector).
Each control signal is converted to a differential signal through LVDS device and sent to the bus cable.

The power supply block consists of IC701 (DC/DC converter), Q712 (transistor), IC703 (regulator).
IC701 and Q712 are circuits to generate 3.3V used in nearly all of the ICs. 
IC703 generates 1.5V used in the CPU (IC200). 

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Signal Name

Contents

EC_AD[15:0]

Address of EC Synchronous bus, Data Bus.

EC_CBE[1:0]

EC Bus command /Byte enable: The indicator drives as bus command in the address phase and as byte
enable in the data phase.

EC_nCDET

EC line card detection signal: Asynchronous interrupting signal

EC_CLK

Clock of EC Synchronous Bus (8MHz) All the EC Bus signal except nRESET/EC_INT operates in sync
with signal.

EC_FARME

EC Cycle frame signal: This indicates the drive by initiator and the execution of EC bus cycle.

EC_nINT

EC Interrupt signal: This is asserted by optional card.

EC_PAR

Parity bit of EC synchronous Bus: Drive by applying even parity to AD[15:0] and CDE[1:0].

EC_nPERR

EC parity error: Flag indicating error status by parity flag.

EC_nRST

EC Reset signal: shelf reset signal

EC_nSTOP

EC Bus Stop signal: This is asserted, when target requests transaction halt to initiator.

EC_nTRDY

EC Target ready signal: This indicates the drive by target and the possible data transfer.

CT_C8

Clock 8.192MHz clock outputted from DPLL

CT_FRAME

Frame signal: 8kHz frame signal outputted from DPLL

CT_D [7:0]

CT Data Bus: Two-way serial data bus to which the drive from any card is possible in the system.

RINGER

Ringer signal :Output square-wave of 20/25Hz as source signal of ringer.

HALT

This alarms the occurrence of the decline DC voltage to line card.
Operation halt signal sent to the option card (when the DC alarm has gone off).

POWTYPE

Notification signal of the power supply type M Power Supply attached: POWTYPE[1:0]= [H, H,] L Power
Supply attached: POWTYPE[1:0]= [H, L]

LED_ALM

Control signal for the extension shelf LED_ALM  H:  Turn ON

LED_RUN

Control signal for the extension shelf LED_RUN  H:  Turn ON

nLOS_BB

Loss of line signal

nSLFFAN_ALM

Alarm signal of the casing fan

nFAN_ALM

Fan alarm signal :It goes Low at the error of the L Power Supply’s Fan.
It goes High when the Fan is normal and Power supply M, which does not carry the FAN are used.

DC_ALM

DC alarm signal :Indicates the declined DC voltage

AC_ALM

AC alarm signal: This indicates AC voltage cutoff.

RING_SYNC

Trigger signal of Ringer signal generation timing to each internal line card.

CLK_16M

Clock 16.386MHz ASIC and CPU operation Clock.

CTSW_EN

CTSW output enable signal

SHW_CLK

Voice system clock signal from the basic shelf (8MHz)

SHW_nFH

Voice system frame signal from the basic shelf (8kHz)

nIRQ_ASIC

Interrupt signal from the ASIC

nIRQ_CCLINK

Interrupt signal from CCLINK

DATA[31:0]

CPU Data Bus

ADD[16:1]

CPU Address Bus

nCS0

Flash ROM select

nCS2

SDRAM Chip select

nCS4

SRAM Chip select

nCS5

ASIC Chip select

nCS_CCLINK

CCLINK Chip select

nCS_CTSW

CTSW Chip select

nRAS

Row Address strobe: for SDRAM

nCAS

Column address strobe: for SDRAM

RD/nWR

Read / Write Signal for SDRAM

DQM[3:0]

Data input output Mask for SDRAM

L_DATA[15:0]

Local data bus

L_ADD[16:1]

Local address bus

L_nRD

Local read signal

L_nWE0, 1

Local byte write signal

L_nWE

Local write signal

L_R/nW

Local read/write signal

nWR_CCLINK

CCLINK write signal

nDS

CCLINK data strobe signal

nRDY

CPU ready signal

ESLFID[1:0]

Extension shelf ID notification signal

BM_nRESET

Extension shelf reset signal

nDTACK

nDTACK signal from CTSW

nWAIT_NEXUS

Access wait signal from the ASIC

S_RING_SYNC

Ringer synchronous input signal from the basic shelf

S_nRESET

Reset input signal from the basic shelf

CPU_STATUS[1:0]

BUS-S status display

CLK_40M

CircLink operating clock (40.0MHz)

CCLINK_TXD

CircLink send data

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The back board (BB) connects signals between optional card in KX-TDA620. It also supplies power from the power supply unit
to the cards.
Connectors Explanation
(1) Power Supply Unit Connector: CN100
(2) Free Slot Connectors: CN101 to CN111
(3) BUS-S Card Connector: CN112
(4) FAN Connector: CN115
(5) LED Connector: CN114
(6)Voltage drop Resistor for Fan control: R400

CCLINK_RXD

CircLink receive data

CCLINK_TXEN

CircLink send data valid

CLK_20M

CTSW operating clock (20.0MHz)

SHWU[2:0]

Intersystem highway upstream data

SHWD[2:0]

Intersystem highway downstream data

SHWU[2:0]_P/N

Intersystem highway upstream differential signal

SHWD[2:0]_P/N

Intersystem highway downstream differential signal

SHW_CLK_P/N

Intersystem clock differential signal

SHW_nFH_P/N

Intersystem frame timing differential signal

S_RINGSYNC_P/N

Ringer synchronous differential signal 

S_nRESET_P/N

Extension shelf reset differential signal

CT_NETREF_P/N

Differential signal of the extension shelf synchronous reference signal 

CCLINK_P/N

Circlink communication differential signal

nLOS_P/N

Differential signal for loss of line indicator

CPU_STATUS[1:0]_P/N

Differential signal for BUS-S status

nSLF_PRS

Extension shelf connection display signal

S_ESLFID[1:0]

Extension shelf ID notification signal

+15V

Power supply

3.3V

IC power supply on the card 

3.3VB

Backup power supply (3.3V)

1.5V

Power supply for CPU (IC200)

12

The TDA620 is a port expansion unit for the TDA600. 
Control of the telephone operates as a PBX, control of the call path, and control of the power supply of the option card contained
in the shelf are done by the BUS-S card.
BUS-S, the option card, and power supply are connected each other through the backboard, and are connected to BUS-M con-
tained in the TDA600 with a bus cable.
The LPR card has a sub-processor, communicates with the CPU of BUS-S through DPRAM of the on board ASIC and controls
various terminals.

This card is a control card for the expansion shelf. It controls the option card contained in the expansion shelf according to the
instructions of EMPR. 
On the BUS-S card are LEDs in two colors that indicate the status of the card and the bus cable connector for connecting to the
BUS-M card. 
Card component outline: 
• 32bit CPU
• SDRAMs, SRAM
•  FLASH memory
•System TSW, Communication IC

• Lithium Battery for back-up of static RAM.

BB is the motherboard of the expansion shelf.

This board connects the power supply to BUS-S and the option card.

This unit is switching regulator power supply and supplies DC voltages to BUS-S card, and optional service card (free slot). PSU
(power supply unit) has four outputs (40V, 30V, 15VPT, 15V). 15V output is supplied only in BUS-S card and option card. Other

outputs are mainly used as an object for the electric supply to a terminal. Refer to each S/M for the details of PSU.