Specifications

Acorn Enhanced Expansion Card Issue 5, August 1994 15
Acorn Enhanced Expansion Card
Figure 14: General timing for slow, medium, and fast cycle types
Sym Parameter Min Nom Max
t1 PS setup to CLK8 40 120
t2 PS width TYPE slow 625
t2 PS width TYPE med 500
t2 PS width TYPE fast 375
t3 PS hold from CLK8 0 50
t4 PS to PRE or PWE TYPE slow 187
t4 PS to PRE or PWE TYPE med/fast 62
t5 PRE or PWE delay from CLK8 0 15
t6 PRE or PWE width TYPE slow/med 375
t6 PRE or PWE width TYPE fast 250
t7 write data setup to CLK8 100
t8 read data setup to PRE 20
t9 read data hold from PRE 15
t10 address setup to CLK8 150
t11 PR/W setup to CLK8 140
(ns)
Figure 13: Fast cycle write
REF8M
PS
BD[0:15]
LA[2:15]
PR/W
PWE
CLK8
PS
PRE
BD[0:15]
LA[2:15]
PR/W
CLK8
REF8M
BD[0:15]
write
read
t1
t5
t5
t7
t10
t11
t8 t9
PWE
t3
t4
t2
t6