Page 30
Epson Research and Development
Vancouver Design Center
S1D13503
Hardware Functional Specification
X18A-A-001-08
Issue Date: 01/01/29
IOR# Timing
Figure 11: IOR# Timing (MC68000)
Table 7-2: IOR# Timing (MC68000)
3V/3.3V
5V
Symbol
Parameter
Min
Max
Min
Max
Units
t1
AB[9:1] and IOCS# valid before AS# falling edge
10
0
ns
t2
AB[9:1] and IOCS# hold from AS# rising edge
20
10
ns
t3
AS# falling edge to DTACK# falling edge
40
25
ns
t4
AS# rising edge to DTACK# hi-z delay
40
25
ns
t5
AS# falling edge to DB[15:0] valid
60
40
ns
t6
DB[15:0] hold from AS# rising edge
20
15
ns
t7
AS# rising edge to DB[15:0] hi-z delay
35
25
ns
AB[9:1]
AS#
R/W#
VALID
VALID
t2a
t3
t7
t1
DB[15:0]
IOCS#
UDS#/LDS#
t4
t5
t6
DTACK#
Hi-Z
Hi-Z
Hi-Z
Hi-Z
t2b
INVALID
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