S71GS128NB0 SPANSION [SPANSION], S71GS128NB0 Datasheet - Page 119

• Manufacturer Part Number: S71GS128NB0
• Description: 128N based MCPs
• Manufacturer: SPANSION [SPANSION]

October 4, 2004 cellRAM_00_A0
BCR[3]
BURST WRAP
0
1
WRAP
Yes
No
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.
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 ad-
dress wraps to 000000h if the burst goes past the last address. Enabling burst
nowrap (BCR[3] = 1) overrides the burst-length setting.
(DECIMAL)
STARTING
ADDRESS
14
15
14
15
…
…
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
A d v a n c e
LENGTH
4-WORD
LINEAR
BURST
0-1-2-3
1-2-3-0
2-3-0-1
3-0-1-2
0-1-2-3
1-2-3-4
2-3-4-5
3-4-5-6
Table 19. Sequence and Burst Length
7-8-9-10-11-12-13-14
8-WORD BURST
6-7-8-9-10-11-12-13
5-6-7-8-9-10-11-12
4-5-6-7-8-9-10-11
3-4-5-6-7-8-9-10
0-1-2-3-4-5-6-7
1-2-3-4-5-6-7-0
2-3-4-5-6-7-0-1
3-4-5-6-7-0-1-2
4-5-6-7-0-1-2-3
5-6-7-0-1-2-3-4
6-7-0-1-2-3-4-5
7-0-1-2-3-4-5-6
0-1-2-3-4-5-6-7
1-2-3-4-5-6-7-8
2-3-4-5-6-7-8-9
LENGTH
I n f o r m a t i o n
LINEAR
CellularRAM Type 2
6-7-8-9-10-11-12-13-14-…-16-17-18-19-20-21
5-6-7-8-9-10-11-12-13-…-15-16-17-18-19-20
14-15-16-17-18-19-…-23-24-25-26-27-28-29
4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19
7-8-9-10-11-12-13-14-…-17-18-19-20-21-22
5-16-17-18-19-20-…-24-25-26-27-28-29-30
3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18
2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17
1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16
0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15
1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-0
2-3-4-5-6-7-8-9-10-11-12-13-14-15-0-1
3-4-5-6-7-8-9-10-11-12-13-14-15-0-1-2
4-5-6-7-8-9-10-11-12-13-14-15-0-1-2-3
5-6-7-8-9-10-11-12-13-14-15-0-1-2-3-4
6-7-8-9-10-11-12-13-14-15-0-1-2-3-4-5
7-8-9-10-11-12-13-14-15-0-1-2-3-4-5-6
14-15-0-1-2-3-4-5-6-7-8-9-10-11-12-13
15-0-1-2-3-4-5-6-7-8-9-10-11-12-13-14
0-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15
16-WORD BURST LENGTH
LINEAR
…
…
14-15-16-17-18-19-20-…
14-15-16-17-18-19-20-…
15-16-17-18-19-20-21-…
15-16-17-18-19-20-21…
7-8-9-10-11-12-13-…
7-8-9-10-11-12-13…
6-7-8-9-10-11-12-…
CONTINUOUS
6-7-8-9-10-11-12…
5-6-7-8-9-10-11-…
5-6-7-8-9-10-11…
4-5-6-7-8-9-10-…
4-5-6-7-8-9-10-…
0-1-2-3-4-5-6-…
1-2-3-4-5-6-7-…
2-3-4-5-6-7-8-…
3-4-5-6-7-8-9-…
0-1-2-3-4-5-6-…
1-2-3-4-5-6-7-…
2-3-4-5-6-7-8-…
3-4-5-6-7-8-9-…
LINEAR
BURST
…
…
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