Abit TX5 Manual do Utilizador descarregar pdf (Página 24)

COMMERCIAL TEMPERATURE RANGE

IDT7290820 5V TIME SLOT INTERCHANGE

DIGITAL SWITCH 2,048 x 2,048

5713 drw16

ADDRESS

CSS

DSH

ASW

CSH

DDR

ADS

ADH

AD0-AD7

D8-D15

DTA

DATA

ADDRESS

DATA

RWS

DWS

DHW

AKD

AD0-AD7

D8-D15

R/W

RWH

DHR

AKH

AC ELECTRICAL CHARACTERISTICS - MULTIPLEXED BUS TIMING (MOTOROLA)

Figure 13. Multiplexed Bus Timing (Motorola Mode)

Symbol Parameter Min. Typ. Max. Units Test Conditions

tASW ALE Pulse Width 80  ns

tADS Address Setup from AS falling 10  ns

tADH Address Hold from AS falling 10  ns

tDDR Data Setup from DTA LOW on Read 10  ns CL = 150pF

tCSH CS Hold after DS falling 0  ns

tCSS CS Setup from DS rising 0  ns

tDHW Data Hold after Write 10  ns

tDWS Data Setup from DS – Write (Fast Write) 25  ns

tSWD Valid Data Delay on Write (Slow Write) 122 ns

tRWS R/W Setup from DS Rising 60  ns

tRWH R/W Hold from DS Rising 10  ns

tDHR

(1)

Data Hold after Read 10 50 75 ns CL = 150pF, RL = 1K

tDSH DS Delay after AS falling 10  ns

tAKD Acknowledgment Delay:

Reading/Writing Registers 55/60 ns CL = 150pF

Reading/Writing Memory  @ 2.048 Mb/s 760/780 ns CL = 150pF

@ 4.096 Mb/s 400/420 ns CL = 150pF

@ 8.192 Mb/s 220/240 ns CL = 150pF

tAKH

(1)

Acknowledgment Hold Time  45 80 n s CL = 150pF, RL = 1K

NOTE:

1. High Impedance is measured by pulling to the appropriate rail with R

, with timing corrected to cancel time taken to discharge C

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