Philips S1D13505 Manual Do Utilizador
Page 72
Epson Research and Development
Vancouver Design Center
S1D13505
Hardware Functional Specification
X23A-A-001-14
Issue Date: 01/02/02
7.3.5 FPM-DRAM CAS Before RAS Refresh Timing
Figure 7-20: FPM-DRAM CAS Before RAS Refresh Timing
Table 7-19: FPM-DRAM CAS Before RAS Refresh Timing
Symbol
Parameter
Min Max
Units
t1
Internal memory clock period
40
ns
t2
RAS# precharge time (REG[22h] bits 3-2 = 00)
2.45 t1 - 3
ns
RAS# precharge time (REG[22h] bits 3-2 = 01 or 10)
1.45 t1 - 3
ns
t3
RAS# pulse width (REG[22h] bits 6-5 = 00 and bits 3-
2 = 00)
2 = 00)
2.45 t1 - 3
ns
RAS# pulse width (REG[22h] bits 6-5 = 00 and bits 3-
2 = 01 or 10)
2 = 01 or 10)
3.45 t1 - 3
ns
RAS# pulse width (REG[22h] bits 6-5 = 01 and bits 3-
2 = 00)
2 = 00)
1.45 t1 - 3
ns
RAS# pulse width (REG[22h] bits 6-5 = 01 and bits 3-
2 = 01 or 10)
2 = 01 or 10)
2.45 t1 - 3
ns
RAS# pulse width (REG[22h] bits 6-5 = 10 and bits 3-
2 = 00)
2 = 00)
0.45 t1 - 3
ns
RAS# pulse width (REG[22h] bits 6-5 = 10 and bits 3-
2 = 01 or 10)
2 = 01 or 10)
1.45 t1 - 3
ns
t4
CAS# pulse width (REG[22h] bits 3-2 = 00)
2 t1 - 3
ns
CAS# pulse width (REG[22h] bits 3-2 = 01 or 10)
1 t1 - 3
t5
CAS# Setup to RAS#
0.45 t1 - 3
ns
t6
CAS# Hold to RAS# (REG[22h] bits 6-5 = 00 and bits
3-2 = 00)
3-2 = 00)
2.45 t1 - 3
ns
CAS# Hold to RAS# (REG[22h] bits 6-5 = 00 and bits
3-2 = 01 or 10)
3-2 = 01 or 10)
3.45 t1 - 3
ns
CAS# Hold to RAS# (REG[22h] bits 6-5 = 01 and bits
3-2 = 00)
3-2 = 00)
1.45 t1 - 3
ns
CAS# Hold to RAS# (REG[22h] bits 6-5 = 01 and bits
3-2 = 01 or 10)
3-2 = 01 or 10)
2.45 t1 - 3
ns
CAS# Hold to RAS# (REG[22h] bits 6-5 = 10 and bits
3-2 = 00)
3-2 = 00)
0.45 t1 - 3
ns
CAS# Hold to RAS# (REG[22h] bits 6-5 = 10 and bits
3-2 = 01 or 10)
3-2 = 01 or 10)
1.45 t1 - 3
ns
RAS#
CAS#
t2
t3
t1
Memory
Clock
t4
t5
t6