1011 DMA READ (BLOCK MODE) TARGET RECEIVE

TLF9756 – 22

Symbol

Parameter

DP5380

Units

Min

Typ

Max

afrt

ACK False to REQ True (DACK or WR False)

120

ns

atrf

ACK True to REQ False

115

ns

atyt

ACK True to READY True

110

ns

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

rfrt

RD False to REQ True (ACK False)

100

ns

rfyf

RD False to READY False

110

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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