~ National ~ Semiconductor - Al Kossow's Bitsavers

4.0 Electrical Specifications (Continued)
Control Pin Timing
Symbol 10# Parameter Formula Min Max Units
tW-RST 1 RESET Low Tx 10 ns
tPD-RST-ICLK 2 RESET Rising to ICLK Rising Tx 4 ns
tSU-ALE-WT 3 WAIT Low after ALE High to Extend Cycle T+ -28 ns
tR-WT-RDWR 4 WAIT Rising before READ or WRITE Rising 1.5T-27 2.5T-1 ns
tW-STRT 5 RESET, REM-RD, REM-WR Low for BCP to Start (Note 2) Tx 10 ns
tSU-LK-ICLK 6 LOCK Low before ICLK High (Note 3) 7 ns
tR-LK-ALE 7 LOCK High to ALE Low 1.5T -13 2.5T+5 ns
Note 1: All parameters are individually tested and guaranteed. Interpreting this data by numerically adding two or more parameters to create a new timing
specification may lead to invalid results.
Note 2: Edges need not be synchronized or asserted/deasserted in any particular order.
Note 3: If tSU-LK-ICLK is not met. the maximum time from LOCK low till no more local accesses is T(MAX(nDW. nlw-1}+3).
RESET
--r-0~
Control Pin Timing
ICLK \. / -
-0-
TL/F/9336-62
WAIT
READ or
WRITE
~
ALE f \.
WAIT Pulse Width
.1 1
f
-:.10 I-
BCP Start Timing
. CD
TL/F/9336-63
RESET
REM-RD
REM-WR
TL/F 19336-64
LOCK Timing
LOCK
ICLK
ALE
j®f
I
\
l®f
TLlF/9336-AB
2-75