107 DMA READ (NON-BLOCK MODE) TARGET RECEIVE

TLF9756 – 18

Symbol

Parameter

DP5380

Units

Min

Typ

Max

afrt

ACK False to REQ True (DACK or WR False)

120

ns

atdt

ACK True to DRQ True (Target)

90

ns

atrf

ACK True to REQ False (Target)

115

ns

ddv

DMA Data Valid from Read Enable (Note 1)

90

ns

dfdt

DACK False to DRQ True

30

90

ns

dfrt

DACK False to REQ True (ACK False)

110

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 4)

40

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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