ST75C520 查看數據表（PDF） - STMicroelectronics

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ST75C520

HIGH SPEED FAX MODEM DATA PUMP

STMicroelectronics 

I - PIN DESCRIPTION

I.1 - Pin Connections

ST75C520

SA0

SA1

SA2

SA3

SA4

SA5

SA6

GND

VDD

SD0

SD1

SD2

SD3

SD4

SD5

SD6

16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

17

64

18

63

19

62

20

61

21

60

22

59

23

58

24

57

25

56

26

55

27

54

28

53

29

52

30

51

31

50

32

49

33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

AGNDT

VCM

AVDD

RXA2

RXA1

AGNDR

VREFP

VREFN

EXTAL

XTAL

CLKOUT

HALT

RESET

SCOUT

BOS

EOS

I.2 - Host Interface

The exchanges with the control processor proceed through a 64 Bytes DUAL port RAM shared between

the ST75C520 and the Host. The signals associated with this interface are :

Pin Name

SD0..SD7

SA0..SA6

SDS (SRD)

SR/W (SWR)

SCS

SDTACK

SINTR

RESET

RING

INT/MOT

Type

I/O

I

I

I

I

OD

OD

I

I

I

Description

System Data Bus. 8-bit data bus used for asynchronous exchanges between the ST75C520

and the Host through the dual port RAM. High impedance when exchanges are not active.

System Address Bus. 7-bit address bus for dual port RAM.

System Data Strobe. Active low. Synchronizes all the exchanges. In Motorola mode initiates

the exchange, active low. In Intel mode initiates a read exchange, active low.

System Read/Write. In Motorola mode defines the type of exchange read/write. In Intel

mode initiates a write exchange, active low.

System Chip Select. Active low.

System Bus Data Acknowledge. Active low. Open drain.

System Interrupt Request. Active low. This signal is asserted by the ST75C520 and

negated by the host. Open drain.

Reset. Active low.

Ring Detect Signal. Active low.

Select Intel/Motorola Interface.

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