W99681CF Datasheet, PDF (47/78 Pages) Winbond – JPEG USB Dual Mode Camera Chip

W99681CF
Bits 10-9 RAS# Precharge Time Control
00 = 2 MCLKs
01 = 3 MCLKs
10 = 4 MCLKs
11 = 5 MCLKs
Bit 8
RAS# Precharge Time Shrink
0 = Not shrink
1 = Shrink by 0.5 MCLK over that specified by bits 10-9 of this register
Bits 7-6
RAS# Low to CAS# Low Time Control
00 = 1 MCLK
01 = 2 MCLKs
10 = 3 MCLKs
11 = 4 MCLKs
Bits 5-3 Refresh Cycle RAS# Low Pulse Width Control
000 ~ 111 = 1 ~ 8 MCLK cycles
Bit 2
RAS# Low Extend
0 = Not extend
1 = Extend 1 MCLK
Bits 1-0
CAS# Low Stretch Control
00 = Not stretch
01 = Stretch approximately 1 ns
10 = Stretch approximately 2 ns
11 = Stretch approximately 3 ns
SDRAM Control Register (CR04)
Read/Write
Index: 0004H
Power-on Default: 0030H
15 14 13 12 11 10 9
Reserved
uC Address: 08H - 09H
876543210
Read Latency BTyp Burst Length
Bits 15-7 Reserved
Bits 6-4 Read Latency
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Publication Release Date: March 2000
Revision A1