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February 17, 2005 S75WS-N-00_A0
S75WS256Nxx Based MCPs
161
Advance
Information
31.2.1
Burst Length (BCR[2:0]): Default = Continuous Burst
Burst lengths define the number of words the device outputs during burst Read operations. The
device supports a burst length of 4, 8, or 16 words. The device can also be set in continuous burst
mode where data is accessed sequentially without regard to address boundaries. Enabling burst
no-wrap with BCR[3] = 1 overrides the burst-length setting.
31.2.2
Burst Wrap (BCR[3]): Default = No Wrap
The burst-wrap option determines if a 4-, 8-, or 16-word Read burst wraps within the burst length
or steps through sequential addresses. If the wrap option is not enabled, the device accesses data
from sequential addresses without regard to burst boundaries. When continuous burst operation
is selected, the internal address wraps to 000000h if the burst goes past the last address. En-
abling burst nowrap (BCR[3] = 1) overrides the burst-length setting.
31.2.3
Output Impedance (BCR[5:4]): Default = Outputs Use Full Drive
Strength
The output driver strength can be altered to full, one-half, or one-quarter strength to adjust for
different data bus loading scenarios. The reduced-strength options are intended for stacked chip
(Flash + CellularRAM) environments when there is a dedicated memory bus. The reduced-drive-
Table 31.2 Sequence and Burst Length
Burst Wrap
Starting
Address
4-word
Burst
Length 8-word Burst Length
16-word Burst Length
Continuous Burst
BCR[3] Wrap (Decimal) Linear
Linear
Linear
Linear
0Yes
0
0-1-2-3
0-1-2-3-4-5-6-7
0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15
0-1-2-3-4-5-6-…
1
1-2-3-0
1-2-3-4-5-6-7-0
1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-0
1-2-3-4-5-6-7-…
2
2-3-0-1
2-3-4-5-6-7-0-1
2-3-4-5-6-7-8-9-10-11-12-13-14-15-0-1
2-3-4-5-6-7-8-…
3
3-0-1-2
3-4-5-6-7-0-1-2
3-4-5-6-7-8-9-10-11-12-13-14-15-0-1-2
3-4-5-6-7-8-9-…
4
4-5-6-7-0-1-2-3
4-5-6-7-8-9-10-11-12-13-14-15-0-1-2-3
4-5-6-7-8-9-10-…
5
5-6-7-0-1-2-3-4
5-6-7-8-9-10-11-12-13-14-15-0-1-2-3-4
5-6-7-8-9-10-11-…
6
6-7-0-1-2-3-4-5
6-7-8-9-10-11-12-13-14-15-0-1-2-3-4-5
6-7-8-9-10-11-12-…
7
7-0-1-2-3-4-5-6
7-8-9-10-11-12-13-14-15-0-1-2-3-4-5-6
7-8-9-10-11-12-13-…
…
……
14
14-15-0-1-2-3-4-5-6-7-8-9-10-11-12-13
14-15-16-17-18-19-20-…
15
15-0-1-2-3-4-5-6-7-8-9-10-11-12-13-14
15-16-17-18-19-20-21…
1No
0
0-1-2-3
0-1-2-3-4-5-6-7
0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15
0-1-2-3-4-5-6-…
1
1-2-3-4
1-2-3-4-5-6-7-8
1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16
1-2-3-4-5-6-7-…
2
2-3-4-5
2-3-4-5-6-7-8-9
2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17
2-3-4-5-6-7-8-…
3
3-4-5-6
3-4-5-6-7-8-9-10
3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18
3-4-5-6-7-8-9-…
4
4-5-6-7-8-9-10-11
4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19
4-5-6-7-8-9-10-…
5
5-6-7-8-9-10-11-12
5-6-7-8-9-10-11-12-13-…-15-16-17-18-19-20
5-6-7-8-9-10-11…
6
6-7-8-9-10-11-12-13
6-7-8-9-10-11-12-13-14-…-16-17-18-19-20-21
6-7-8-9-10-11-12…
7
7-8-9-10-11-12-13-14
7-8-9-10-11-12-13-14-…-17-18-19-20-21-22
7-8-9-10-11-12-13…
…
……
14
14-15-16-17-18-19-…-23-24-25-26-27-28-29
14-15-16-17-18-19-20-…
15
5-16-17-18-19-20-…-24-25-26-27-28-29-30
15-16-17-18-19-20-21-…



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