W968D6DA Datasheet, PDF (26/75 Pages) Winbond – Low-power features

W968D6DA
8.4.3.1 Bus Configuration Register Definition
256Mb Async./Page,Syn./Burst CellularRAM
A[max:0] A[19:18] A[17:16] A15
A14 A13 A12 A11 A10
A9
A8
A7
A6
A5
A4
A3
A2 A1 A0
max - 20 19 - 18 17 - 16
15
14
Register
Operating Initial
Reserved _Select Reserved _{Mode Latency}
13 12 11 10
Latency WAIT
Counter Polarity
9
8
WAIT
Reserved ^{Configuration}
(WC)
7
Reserved
6
Reserved
5
4
Drive Strength
3
21 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 ( def )
Code 4
Reserved
Code 2
Code 3
Code 4
Code 5
Code 6
Code 8
Reserved
BCR [ 3 ]
0
1
Burst Wrap ( note 1 )
Burst wraps within the burst length
Burst no wraps ( default )
BCR [ 5 ] BCR [ 4 ]
0
0
0
1
1
0
1
1
Drive Strength
Full
1 / 2 ( default )
1/4
Reserved
BCR [ 15 ]
0
1
Operating Mode
Synchronous burst access mode
Asynchronous access mode ( default )
BCR [ 8 ]
0
WAIT Configuration
Asserted during delay
1
Asserted one data cycle before delay ( default )
BCR [ 19 ] BCR [ 18 ]
0
0
1
0
0
1
1
1
Register Select
Select RCR
Select BCR
Select DIDR
Reserved
BCR [ 10 ]
0
1
WAIT Polarity
Active Low
Active HIGH ( default )
BCR [ 2 ] BCR [ 1 ] BCR [ 0 ]
0
0
1
0
1
0
0
1
1
1
0
0
Burst Length ( note 1 )
4 words
8 words
16 words
32 words
1
1
1
Continuous burst ( default )
Note: 1. Burst wrap and length apply to both READ and WRITE operations.
Others
Reserved
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Publication Release Date : June 27, 2013
Revision : A01-003