1012 DMA READ (BLOCK MODE) INITIATOR RECEIVE

TLF9756 – 23

Symbol

Parameter

DP5380

Units

Min

Typ

Max

ddv

DMA Data Valid from Read Enable (Note 1)

90

ns

dhr

Data Hold from End of Read Enable (Notes 1 2)

10

60

ns

dhra

SCSI Data Hold from REQ or ACK True

30

ns

dsra

SCSI Data Setup Time to REQ or ACK True

20

ns

dtdf

DACK True to DRQ False

100

ns

eop

Width of EOP Pulse (Note 3)

40

ns

rdaf

RD False to ACK False (REQ False)

125

ns

rfaf

REQ False to ACK False (DACK False)

100

ns

rfyf

RD False to READY True False

110

ns

rtat2

REQ True to ACK True

100

ns

rtyt

REQ True to READY True

75

ns

rydv

READY True to Data Valid

35

ns

Note 1

Read enable (DMA) is DACK and RD active

Note 2

This includes the RC delay inherent in the tests’ method These signals typically turn off after 25 ns enabling other devices to drive these lines with no

contention

Note 3

EOP DACK RDWR must all be active for recognition of EOP

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