Page 32
Epson Research and Development
Vancouver Design Center
S1D13503
Hardware Functional Specification
X18A-A-001-08
Issue Date: 01/01/29
MEMR# Timing
Figure 13: MEMR# Timing (MC68000)
Where MCLK period = 1/f
OSC
, or 2/f
OSC
, or 4/f
OSC
depending on which display mode the chip is in. (see section 9.2 and
9.3)
Table 7-4: MEMR# Timing (MC68000)
3V/3.3V
5V
Symbol
Parameter
Min
Max
Min
Max
Units
t1
AB[19:1] and MEMCS# valid before AS# falling edge
0
0
ns
t2
AB[19:1] and MEMCS# hold from AS# rising edge
0
0
ns
t3
AS# falling edge to DTACK# falling edge
3.5 *
MCLK
+ 20
3.5 *
MCLK
+ 10
ns
t4
AS# rising edge to DTACK# hi-z delay
40
15
ns
t5
DTACK# falling edge to DB[15:0] valid
20
15
ns
t6
DB[15:0] hold from AS# rising edge
25
15
ns
t7
AS# rising edge to DB[15:0] hi-z delay
40
30
ns
AB[19:1]
AS#
UDS#/LDS#
DTACK#
VALID
VALID
t1
t3
t7
t5
t2
t6
t4
DB[15:0]
MEMCS#
R/W#
Hi-Z
Hi-Z
Hi-Z
Hi-Z
INVALID
electronic components distributor