W958D6DB Datasheet, PDF (23/57 Pages) Winbond – Low-power features

W958D6DB
8.4.3.1 Bus Configuration Register Definition
A[max:20] A[19:18] A[17:16] A/DQ15 A/DQ14 A/DQ[ 13:11] A/DQ10 A/DQ9
256Mb Async./Burst/Sync./A/D MUX
A/DQ8
A/DQ7
A/DQ6
A/DQ5 A/DQ4 A/DQ3 A/DQ[2:0]
max- 20 19- 18 17- 16
15
14- 11
Reserved
Register
Select
Reserved
Operating
Mode
Initial
Latency
Latency
Counter
10
WAIT
Polarity
9
8
Reserved WAIT
Configuration ( WC )
7
Reserved
6
Reserved
5
4
Drive Strength
3
2-0
Burst
Burst
Wrap(BW)* Length ( BL)*
All must be set to " 0"
Must be set to "0"
Must be set to "0"
Must be set to "0"
Must be set to "0"
BCR[14] BCR[13] BCR[12] BCR[11]
0
0
1
0
0
0
1
1
0
1
0
0
0
All others
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
0
0
0
1
All others
Latency
code 2
code 3( default)
code 4
Reserved
code 2
code 3
code 4
code 5
code 6
code 8
Reserved
BCR [ 3]
0
1
BCR [ 5]
0
0
1
1
BCR [ 4]
0
1
0
1
Burst Wrap ( Note 1)
Burst wraps within the burst length
Burst no wraps ( default)
Drive Strength
Full
1/ 2 ( default )
1/ 4
reserved
BCR[10]
0
1
WAIT Polarity
Active Low
Active HIGH ( Default)
BCR [ 8]
0
1
WAIT Configuration
Asserted during delay
Asserted one data cycle before delay ( default)
BCR[15]
0
1
Operating Mode
Synchronous burst access mode
Asynchronous access mode ( Default)
BCR[19]
0
1
0
BCR[18]
0
0
1
Register Select
Select RCR
Select BCR
Select DIDR
BCR[2] BCR[ 1] BCR[0] Burst Length ( Note1)
0
0
1
4 words
0
1
0
8 words
0
1
1
16 words
1
0
0
32 words
1
1
1
Continuous burst ( default)
Others
Reserved
Notes: 1. Burst wrap and length apply to both READ and WRITE operations.
2.Reserved bits must be set to zero. Reserved bits not set to zero will affect device functionality. BCR[15:0] will be read
back as written.
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Publication Release Date : June 27 ,2013
Revision : A01-003