108 DMA READ (NON-BLOCK MODE) INITIATOR RECEIVE

TLF9756 – 19

Symbol

Parameter

DP5380

Units

Min

Typ

Max

ddv

DMA Data Valid from Read Enable (Note 1)

90

ns

dfaf

DACK False to ACK False (REQ False Non-block In rx)

120

ns

dfdt

DACK False to DRQ True

30

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 (Receive)

30

ns

dkhr

DACK Hold from End of RD

0

ns

dsra

SCSI Data Setup Time to REQ or ACK True (Receive)

20

ns

dtdf

DACK True to DRQ False

100

ns

eop

Width of EOP Pulse (Note 3)

40

ns

rfaf

REQ False to ACK False (DACK False)

100

ns

rtat

REQ True to ACK True (Initiator Receive)

100

ns

rtdt

REQ True to DRQ True

120

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 true for recognition of EOP

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