Z53C80 datasheet(19/40 Pages) ZILOG

Part #	Z53C80

Description	SMALL COMPUTER SYSTEM INTERFACE (SCSI)

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Manufacturer	ZILOG [Zilog, Inc.]

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19

Z53C80 SCSI

ZILOG

PS97SCC0200

READ REGISTERS

Figure 27. Current SCSI Data Register

Figure 28. Initiator Command Register

Figure 29. Mode Register

Figure 30. Target Command Register

Figure 31. Current SCSI Bus Status Register

Figure 32. Bus and Status Register

/DB0

/DB1

/DB2

/DB3

/DB4

/DB5

/DB6

/DB7

Address: 0

(Read Only)

D7 D6 D5 D4 D3 D2 D1 D0

Assert Data Bus

Assert /ATN

Assert /SEL

Assert /BSY

Assert /ACK

Lost Arbitration

Arbitration in Progress

Assert /RST

Address: 1

(Read Only)

D7 D6 D5 D4 D3 D2 D1 D0

Arbitrate

DMA Mode

Monitor /BSY

Enable /EOP Interrupt

Enable Parity Interrupt

Enable Parity Checking

Target Mode

"0"

Address: 2

(Read Only)

D7 D6 D5 D4 D3 D2 D1 D0

Assert I//O

Assert C//D

Assert /MSG

Assert /REQ

"0"

Last Byte Sent

Address: 3

(Read Only)

D7 D6 D5 D4 D3 D2 D1 D0

/DBP

/SEL

I//O

C//D

/MSG

/REQ

/BSY

/RST

Address: 4

(Read Only)

D7 D6 D5 D4 D3 D2 D1 D0

/ACK

/ATN

Busy Error

Phase Match

Interrupt Request Active

Parity Error

DMA Request

End of DMA

D7 D6 D5 D4 D3 D2 D1 D0

Address: 5

(Read Only)

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