Numonyx™ Wireless Flash Memory (W18)
Table 35: Sequence and Burst Length
Start Addr. (Dec)
Burst Addressing Sequence (Decimal)
4-Word Burst
RCR[2:0]=001b
Linear
0-1-2-3
1-2-3-0
2-3-0-1
3-0-1-2
8-Word Burst
RCR[2:0]=010b
Linear
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
...
...
16-Word Burst
RCR[2:0]=011b
Linear
0-1-2...14-15
1-2-3...14-15-0
2-3-4...15-0-1
3-4-5...15-0-1-2
4-5-6...15-0-1-2-3
5-6-7...15-0-1...4
6-7-8...15-0-1...5
7-8-9...15-0-1...6
...
Continuous Burst
RCR[2:0]=111b
Linear
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-...
4-5-6-7-8-9-10...
5-6-7-8-9-10-11...
6-7-8-9-10-11-12-...
7-8-9-10-11-12-13...
...
0
1
2
Wrap (RCR[3]=0)
3
4
5
6
7
...
14
15
0
1
No-Wrap (RCR[3]=1)
2
3
4
5
6
7
...
14
15
14-15-0-1...13
15-0-1-2-3...14
0-1-2-3
1-2-3-4
2-3-4-5
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
3-4-5-6-7-8-9-10
4-5-6-7-8-9-10-11
5-6-7-8-9-10-11-12
6-7-8-9-10-11-12-13
7-8-9-10-11-12-13-14
...
...
0-1-2...14-15
1-2-3...15-16
2-3-4...16-17
3-4-5...17-18
4-5-6...18-19
5-6-7...19-20
6-7-8...20-21
7-8-9...21-22
...
14-15-16-17-18-19-20-...
15-16-17-18-19-...
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-...
4-5-6-7-8-9-10...
5-6-7-8-9-10-11...
6-7-8-9-10-11-12-...
7-8-9-10-11-12-13...
...
14-15...28-29
15-16...29-30
14-15-16-17-18-19-20-...
15-16-17-18-19-20-21-...
14.8
Clock Edge (RCR[6])
Configuring the valid clock edge enables a flexible memory interface to a wide range of
burst CPUs. Clock configuration sets the device to start a burst cycle, output data, and
assert WAIT on the clock’s rising or falling edge.
14.9
Burst Wrap (RCR[3])
The burst wrap bit determines whether 4-, 8-, or 16-word burst accesses wrap within
the burst-length boundary or whether they cross word-length boundaries to perform
linear accesses. No-wrap mode (RCR[3]=1) enables WAIT to hold off the system
processor, as it does in the continuous burst mode, until valid data is available. In no-
wrap mode (RCR[3]=0), the device operates similarly to continuous linear burst mode
but consumes less power during 4-, 8-, or 16-word bursts.
For example, if RCR[3]=0 (wrap mode) and RCR[2:0] = 1h (4-word burst), possible
linear burst sequences are 0-1-2-3, 1-2-3-0, 2-3-0-1, 3-0-1-2.
Datasheet
84
November 2007
Order Number: 290701-18
NUMONYX [ NUMONYX B.V ]
