HT6576 Ver la hoja de datos (PDF) - Holtek Semiconductor

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HT6576

Advanced SCSI CHIP

Holtek Semiconductor 

SCSI Interface Signals

Pin No Pin Name

33

ACK

6

ATN

4

BSY

30

C/D

32

I/O

29

MSG

34

REQ

2

RST

37~41,

43, 44, 1

DB0–DB7

35

DBP

5

SEL

I/O

Description

I/O Acknowledge, active low

I/O Attention, active low

I/O Busy, active low

I/O Control/Data, active low

I/O Input/Output, active low

I/O Message, active low

I/O Request, active low

I/O Reset, active low

I/O SCSI Data Bus, active low

I/O SCSI Parity Bit, active low

I/O Select, active low

VSS

3, 12, 31, 36, 42

VDD

23

HT6576A

Registers

Address 0

Current SCSI data register(READ ONLY)

DB7

DB6

DB5

DB4

DB3

DB2

The SCSI bus parity is checked at the beginning of the read cycle.

Output data register(WRITE ONLY)

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB1

DB0

DB0

3

14th July ’97

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