S1D13505 Epson Electronics America, Inc., S1D13505 Datasheet - Page 78

• Manufacturer Part Number: S1D13505
• Description: LCD Controller
• Manufacturer: Epson Electronics America, Inc.

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