Table 6.40 Target Asynchronous Receive

Symbol

Parameter

Min

Max

Unit

 

 

 

 

 

t1

SREQ/ deasserted from SACK/ asserted

5

ns

 

 

 

 

 

t2

SREQ/ asserted from SACK/ deasserted

5

ns

t3

Data setup to SACK/ asserted

0

ns

t4

Data hold from SREQ/ deasserted

0

ns

Figure 6.36 Target Asynchronous Receive

SREQ/

SACK/

SD[15:0]/,

SDP[1:0]/

 

n

 

t1

 

n

t3

t4

 

Valid n

n + 1

t2

n + 1

Valid n + 1

Table 6.41 SCSI-1 Transfers (5.0 Mbytes)

Symbol

Parameter

Min

Max

Unit

 

 

 

 

 

t1

Send SREQ/ or SACK/ assertion pulse width

80

ns

t2

Send SREQ/ or SACK/ deassertion pulse width

80

ns

 

 

 

 

 

t1

Receive SREQ/ or SACK/ assertion pulse width

70

ns

 

 

 

 

 

t2

Receive SREQ/ or SACK/ deassertion pulse width

70

ns

 

 

 

 

 

t3

Send data setup to SREQ/ or SACK/ asserted

24

ns

 

 

 

 

 

t4

Send data hold from SREQ/ or SACK/ asserted

54

ns

 

 

 

 

 

t5

Receive data setup to SREQ/ or SACK/ asserted

14

ns

t6

Receive data hold from SREQ/ or SACK/ asserted

24

ns

 

 

 

 

 

SCSI Timing Diagrams

6-55

Page 293
Image 293
LSI 53C875A technical manual Target Asynchronous Receive, SCSI-1 Transfers 5.0 Mbytes