Page 36
Epson Research and Development
Vancouver Design Center
S1D13503
Hardware Functional Specification
X18A-A-001-08
Issue Date: 01/01/29
MEMR# Timing
Figure 17: MEMR# Timing (Non-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 7-8: MEMR# Timing (Non-MC68000)
3V/3.3V
5V
Symbol
Parameter
Min
Max
Min
Max
Units
t1
AB[19:0], BHE# and MEMCS# valid before MEMR#
falling edge
0
0
ns
t2
AB[19:0], BHE# and MEMCS# hold from MEMR#
rising edge
0
0
ns
t3
MEMR# falling edge to READY falling edge
30
20
ns
t4
READY rising edge to DB[15:0] valid
15
10
ns
t5
DB[15:0] hold from MEMR# rising edge
20
10
ns
t6
MEMR# rising edge to DB[15:0] hi-z delay
30
20
ns
t7
READY negated pulse width
3.5*
MCLK
+ 20
3.5*
MCLK
+ 10
ns
AB[19:0]
MEMCS#
MEMR#
READY
VALID
VALID
t1
t3
t7
t5
t2
t6
t4
DB[15:0]
BHE#
Hi-Z
Hi-Z
Hi-Z
Hi-Z
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