SED1354 Datasheet, PDF (58/472 Pages) Epson Company – Color Graphics LCD/CRT Controller

Page 50
Epson Research and Development
Vancouver Design Center
Table 7-8: EDO DRAM Write Timing
Symbol
Parameter
Min
Typ
Max
Units
t1
Memory clock period
25
ns
Random read or write cycle time (REG[22h] bits [6:5] = 00)
5 t1
ns
t2
Random read or write cycle time (REG[22h] bits [6:5] = 01)
4 t1
ns
Random read or write cycle time (REG[22h] bits [6:5] = 10)
3 t1
ns
Row address setup time (REG[22h] bits [3:2] = 00)
2.45 t1
ns
t3
Row address setup time (REG[22h] bits [3:2] = 01)
2 t1
ns
Row address setup time (REG[22h] bits [3:2] = 10)
1.45 t1
ns
Row address hold time (REG[22h] bits [3:2] = 00 or 10)
0.45 t1 - 1
ns
t4
Row address hold time (REG[22h] bits [3:2] = 01)
t1 - 1
ns
t5
Column address setup time
0.45 t1 - 1
ns
t6
Column address hold time
0.45 t1 - 1
ns
t7
CAS# pulse width
0.45 t1
0.55 t1 + 1 ns
t8
CAS# precharge time
0.45 t1 - 1
0.55 t1
ns
t9
RAS# hold time
1 t1
ns
RAS# precharge time (REG[22h] bits [3:2] = 00)
2 t1 - 1
ns
t10
RAS# precharge time (REG[22h] bits [3:2] = 01)
1.45 t1 - 1
ns
RAS# precharge time (REG[22h] bits [3:2] = 10)
1 t1 - 1
ns
RAS# to CAS# delay time
(REG[22h] bit 4 = 0 and bits [3:2] = 00 or 10)
t11
RAS# to CAS# delay time
(REG[22h] bit 4 = 1 and bits [3:2] = 00 or 10)
RAS# to CAS# delay time (REG[22h] bits [3:2] = 01)
2 t1 - 2
1 t1 - 2
1.45 t1 - 2
2 t1
ns
1 t1
ns
1.55 t1
ns
t12
Write command setup time
0.45 t1 - 1
ns
t13
Write command hold time
0.45 t1
ns
t14
Write Data setup time
0.45 t1 - 3
ns
t15
Write Data hold time
0.45 t1 - 2
ns
SED1354
X19A-A-002-16
Hardware Functional Specification
Issue Date: 99/05/18