~ National ~ Semiconductor - Al Kossow's Bitsavers

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15.0 Switching Characteristics (Continued)
Register Write (Non Latched, ADSO = 1)
RAO-3
cs
I---- rsws __
ww
SWR
I-- rswh-./
I
ĀCK
ADO-7
I--- wackl ..... t: wackh
C rwds I rwdh
DO-7
I
TLiF/8582-79
Symbol Parameter Min Max Units
rsws
Register Select to Write Setup
(Note 1)
rswh Register Select Hold from Write a ns
rwds Register Write Data Setup 20 ns
rwdh Register Write Data Hold 21 ns
wackl
Write Low to ACK Low
(Note 2)
15
n*bcyc + 30
wackh Write High to ACK High 30 ns
ww Write Width from ACK 50 ns
Note 1: Assumes ADSO is high when RAO-3 changing.
Note 2: ACK is not generated until cs: and SWR are low and the NIC has synchronized to the register access. In Dual Bus systems additional cycles will be used for
a local DMA or remote DMA to complete.
ns
ns
1-40