W989D6DB Datasheet, PDF (24/64 Pages) Winbond – Standard Self Refresh Mode

W989D6DB / W989D2DB
8.5.7 CAS Latency field (A6~A4)
This field specifies the number of clock cycles from the assertion of the Read command to the first data read. The
minimum values of CAS Latency depends on the frequency of CLK. The minimum value which satisfies the
following formula must be set in this field.
A6
A5
A4
CAS Latency
0
1
0
2 clock
0
1
1
3 clock
 Reserved bits (A7, A8, A10, A11, A12, BA0, BA1)
These bits are reserved for future operations. They must be set to 0 for normal operation.
 Single Write mode (A9)
This bit is used to select the write mode. When the A9 bit is 0, Burst Read and Burst Write mode are selected.
When the A9 bit is 1, Burst Read and Single Write mode are selected.
A9
Write Mode
0
Burst Read and Burst Write
1
Burst Read and Single Write
8.5.8 Mode Register Definition
A0
A1
Burst Length
A2
A3
Addressing Mode
A4
A5
CAS Latency
A6
A07
"0"
Reserved
A8
"0"
Reserved
A09
Write Mode
A10
"0"
A11
"0"
A12 "0"
Reserved
BA0 _"0"
BA1 "0"
A2 A1 A0
000
001
010
011
100
101
110
111
A03
0
1
A6 A5 A4
000
001
010
011
100
A09
0
1
Burst Length
Sequential
Interleave
1
1
2
2
4
4
8
8
Reserved
Reserved
FuAll 0Page
Addressing Mode
Sequential
Interleave
CAS Latency
Reserved
Reserved
2
3
Reserved
Single Write Mode
Burst read and Burst write
Burst read and single write
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Publication Release Date: Mar. 19, 2014
Revision: A01-001