Am33c93a Scsi-bus Interface Controller Timing 3

DMAWRITE Symbol

Charaaerlstlc

tor-wl tor.oH tw* twrm tournn twHox tw"or

DreR Lowto WELow mffi'LowroDE,High

Unlts

WE PulseWidth

WEHishtom VffioWEH

High to DRQ Low

tulol

ns ns ns ns ns ns ns ns

25 0 0 0

DRQ(OUT)

oncx(r|\q)

NorE: Externalbad on Dm a oncx b assumed to be 1K o.

11853019A

DMA READ

Symbol

Characterlstlc

to,-*rtouon tro tnnnl tnlov tnuo" tnHor tonol

DreK Lowto ffi Low DffiLowtoffiEHigh

Mln

Unlts

0 5 0

ns ns ns ns ns ns ns ns

RE PulseWidth RE Highto

n-Et-offffiav TA lnvalid

Highto DHE Low

4A

DRO(OUT) OACK(tttt)

NE DO-D7 NOTE:Externalload on DRO a OACKis assumedto be 1K O. 11853-0204

Am3ilC93A

4-65

DIRECTBUFFERACCESSWRITE Symbol

Characterlstlc

torr. tsl* two t*r-ou twxot twnvvl to.t" tsr,*

DRQHighto RCSLow F-6 Lowto WE Vatid WE PulseWidth m Lowto DataValid WE Highto DataI WE Highto WE

Max

Unlts

0 0

40 20

100

ns ns ns ns ns ns ns ns ns ns ns ns

Max

Unlts

50

8.Tcyc

DRQ Lgv to

,ffi

Mln

igh WE Low

Lowto wE Low(1) FF Lowto DRQLow(2)

10'Tcyc 100

0 60 0

t QHSL

ffitrttl RCS(OUT)

WE(ourl DO_D7

DIRECTBUFFERACCESSREAD

Symbol

Characterlstlc

Mln

ns ns ns ns ns ns ns ns ns ns ns ns

tongtsr-*v tno tovn,r tnno' tnrn. to.g.. tsr*,

l*"ffi t oxst ffi1ttt1

H-F(our) FE(our) DO-D7 Note 1: Guaranteedthat one mor€ byte will be transferred. Note 2: Guaranteedthat only one byte will be transferred.

tt-66

AmSlC93A