W90221X Winbond Electronics Corp America, W90221X Datasheet - Page 58

• Manufacturer Part Number: W90221X
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

DRAM Timing Control Register 0 (DRAMTCTL0)
Port address: 0x0000003a
Bits 0-2
Bits 3-4
Bits 5-6
W90221X version 0.6
0
8
RASact[1:2]
Refresh Rate [0:2]
1
9
Refresh rate
CAS latency
Active command delay
DRAMTCTL0
DRAMTCTL0
DRAMTCTL0
RAS Precharge Time [0:2]
10
2
[0:2]
[3:4]
[5:6]
000
001
010
011
100
101
110
111
00
01
10
11
00
01
10
11
Access type: read/write
CAS Latency [0:1]
11
3
15 s (default)
Delay (MCLK)
Refresh Rate
CAS Latency
Command
3 (default)
3 (default)
Reserved
(MCLK)
Disable
120 s
240 s
480 s
960 s
Active
30 s
60 s
1
2
0
1
2
12
4
13
ACMDdly[0:1]
5
DRAM Cycle Time [0:2]
14
6
Default: 0x0
RASact[0]
15
7
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