~ National ~ Semiconductor - Al Kossow's Bitsavers

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15.0 Switching Characteristics (Continued)
BSCK
DMA Memory Write
I T1 I T2 I TJ I T4 I T1 I
AOSO
/""\
..... asds I-
I-bcwl bcwh 4-
t.lWR
AOO-7
(8, 16 BIT MODE)
A08-15
(8 BIT MODE)
AOO-15
(16 BIT MODE)
--aswd wds- wdh 4-
AO-A7 XIII DATA (00-07) AO-A7XI I /
--
waz 4-
A8-A15 A8-15
I---wds- wdh 4-
AO-A15 XIII DATA (00-015) AO-A15X/ / /
TL/F/9345-43
Symbol Parameter Min Max Units
bewl Bus Clock to Write Strobe Low 40 ns
bewh Bus Clock to Write Strobe High 40 ns
wds Data Setup to WR High 2*beye - 30 ns
wdh Data Hold from WR Low bch + 7 ns
waz
Write Strobe to Address TRI-STATE
(Notes 1, 2)
beh + 40
asds Address Strobe to Data Strobe bel + 10 ns
aswd Address Strobe to Write Data Valid bel + 30 ns
Note 1: When using byte mode transfers AB-A15 are only TRI-STATE on the last transfer, waz timing is only valid for last transfer in a burst.
Note 2: These limits include the RC delay inherent in our test method. These signals typically turn off within bch + 15 ns, enabling other devices to drive these
lines with no contention.
ns
1-94