Page 34
Epson Research and Development
Vancouver Design Center
SED1352
Hardware Functional Specification
X16-SP-001-16
Issue Date: 99/07/28
MEMW# Timing
Figure 16: MEMW# Timing (Non-68000)
Where MCLK period = 1/f
OSC
, or 2/f
OSC
, or 4/f
OSC
depending on which mode the chip is in. (see section 9.2 and 9.3).
Table 7-7: MEMW# Timing (Non-68000)
3V/3.3V
5V
Symbol
Parameter
Min
Typ
Max
Min
Typ
Max
Unit
s
t1
AB[19:0], BHE# and MEMCS# valid before MEMW#
falling edge
0
0
ns
t2
AB[19:0], BHE# and MEMCS# hold from MEMW#
rising edge
0
0
ns
t3
MEMW# falling edge to READY falling edge
30
20
ns
t4
MEMW# falling edge to DB[15:0] valid
120
140
ns
t5
DB[15:0] hold from MEMW# rising edge
0
0
ns
t6
READY negated pulse width
3.5*
MCLK
+ 20
3.5*
MCLK
+ 10
ns
AB[19:0]
MEMCS#
MEMW#
READY
VALID
VALID
t1
t3
t6
t2
t5
t4
DB[15:0]
BHE#
Hi-Z
Hi-Z
Hi-Z
Hi-Z