KX-HT82480, KX-HT82470, KX-HT82460 - Panasonic PBX Service Manual (repair manual). Page 11

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LCOT4 block is responsible for supporting up to 4 ports Analog Trunk interface with Caller ID function.

A PLD (Programable Logic device) is equipped on KX-HT82480(LCOT4 Option Card), and this device has several interfacing func-
tions as below.

Transmits 10pps/20pps dial pulse by a open/close action between Tip and Ring with Photo MOS relay which is controlled by DSP
GPIO port.
The make width, break width and inter digit width for 10pps/20pps can be set respectively.

When making DP[0-3] pin of DSP becomes Low level, and PC902A-D turns ON. When breaking, DP[0-3] of DSP becomes High
level, and PC902A-D turns OFF.

SLIC

Number of Support Channel

2ch/device

Number of Devices

2

CPU Interface

Interface

SPI-BUS

Bus Clock

4.096MHz

Device Select Logic

DEV_SEL[2:0]

ACK Control

DSP ACK

Up to 2

TDM Interface

TDM TS

16bit x 32TS

TDM Clock

4.096MHz
Clock Slave

TDM -

SPI -IF

TDM -IF
SPI-IF

CPLD

DE56#1

DE56#2

FXO Interface Analog Circuit

RJ11

FXO Interface Analog Circuit

FXO Interface Analog Circuit

FXO Interface Analog Circuit

RJ11
JK900 - B

RJ11

RJ11
JK900 - D

TDM

-I

F

SPI

-I

F

Control(Reset/

Int)

13.824MHz

CL

K(13.824MHz)

nRESET_OUT

TDM-IF

SPI -IF

IF

+

-

+

-

+

-

REVDET[0]

DP[0]

*RL900A

NC

1

2

3

4

*D904A

2

1

R930A

C926A

IC909A

3

2

1

R944A

D910A

_

_

C930A

C935A

C901A

+3.3V_DE56_2

VH1

DG

+3.3V_DE56_2

+3.3V_DE56_2

IC909A

5

6

7

R943A

PC900A

1

23

4

VH1

C904A

C924A

DG

R936A

C921A

C933A

DG

PC903A

1

2

3

4

R920A

C908A

+3.3V_DE56_2

*R901A

+3.3V_DE56_2

R946A

Q900A

C906A

*C905A

*C907A

D908A

3

1

2

4

DG

PC902A

1

3

4

6

*C912A

T900A

3

1

6

4

5

*D902A

*D906A

R981A

VH1

R980A

DG

C960A

*ZNR900A

*R908A

*R932A

*C916A

*R938A

*C918A

*R954A

*C928A

*R906A

*R904A

*R948A

*R922A

*R916A

*R934A

*R940A

PC901A

1

2

3

4

*C910A

*Q904A

*R900A

R902A

R914A

R918A

R924A

R926A

R928A

R950A

R956A