2. DTE Interface Pins

3. Eye Pattern Interface Pins

4. V.24 (RS-232C) Interface Pins

5. Analog Signal Pins

No. 4974-5/8

LC89201

Pin No.

Symbol

I/O

Function

29

D0

28

D1

27

D2

26

D3

B

Data bus to host CPU

25

D4

23

D5

22

D6

21

D7

20

A0

19

A1

18

A2

I

Address bus to host CPU

17

A3

16

A4

30

CSB

I

Chip select signal

32

READB

I

Interface memory read signal

33

WRITEB

I

Interface memory write signal

34

IREQB

O

Interrupt request to host CPU

15

RESETB

I

System reset signal

Pin No.

Symbol

I/O

Function

67

EYECLK

O

Timing clock for generating eye pattern data. This may be used as the shift clock for an external shift register.

68

EYESYNC

O

Eye pattern synchronization signal

66

EYEX

O

Eye pattern data serial outputs (8 bits, MSB first)

65

EYEY

Pin No.

Symbol

I/O

Function

57

RTSB

I

Request to send signal. The low level at this pin starts transmission; the high level suspends it.

59

CTSB

O

Clear to send signal. The low level at this pin signals the availability of data for transmission; the high level indicates

that the data is invalid.

58

RLSDB

O

Received line signal data signal. The low level at this pin gives the timing for transferring the data received to the

terminal.

61

TXD

I

Transmit data input

60

RXD

O

Receive data output

62

DCLK

O

Transmission data clock output

Pin No.

Symbol

I/O

Function

39

TXA

O

Transmitter analog output

44

RXA

I

Receiver analog input

43

AUXIN

I

Auxiliary analog input

40

OPA2P

I

41

OPA2M

I

Transmission buffer input/output pins. (For details, see circuit diagram.)

42

OPA2O

O

47

OPA1P

I

46

OPA1M

I

Reception buffer input/output pins (For details, see circuit diagram.)

45

OPA1O

O

49

PGCI

I

Reception gain adjustment circuit input. (For details, seecircuit diagram.)

48

PGCO

O

Reception gain adjustment circuit output.