Read Panasonic KX-TDE620BX (serv.man2) Service Manual online
9
KX-TDE620BX
4.2.1.3.
Circuit Description
ASIC Block (Sheet1)
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.
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.
CPU Block (Sheet2)
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.
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.
Memory Block (Sheet3)
This block consists of IC301, 302 (SDRAM), IC303 (flash ROM), IC304 (SRAM), separate the main and local buses: as well as
IC305, IC306, IC307, IC308, IC309, IC310, IC311, IC313 which separate (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.
IC305, IC306, IC307, IC308, IC309, IC310, IC311, IC313 which separate (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.
CircLink Block (Sheet4)
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.
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.
System TSW Block (Sheet5)
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.
It is capable of exchanging voice data between the CT bus (1024ch) within the unit and the voice bus (384ch) of the basic shelf.
Bus Cable Connection Block (Sheet6)
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.
Each control signal is converted to a differential signal through LVDS device and sent to the bus cable.
On board Power supply (Sheet7)
The power supply block consists of IC701 (DC/DC converter), Q712 (transistor), IC703 (regulator), and IC704 (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). IC704 generates 2.5V used in IC402.
IC704 generates 2.5V used in IC402.
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). IC704 generates 2.5V used in IC402.
IC704 generates 2.5V used in IC402.
Explanation of signals used in the block diagrams
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.
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.
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).
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]
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.
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
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