PC48F4400PLVB0 datasheet(84/102 Pages) NUMONYX

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Numonyx™ Wireless Flash Memory (W18)

Datasheet

November 2007

Order Number: 290701-18

Numonyx™ Wireless Flash Memory (W18)

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.

Table 35: Sequence and Burst Length

Burst Addressing Sequence (Decimal)

4-Word Burst

RCR[2:0]=001b

8-Word Burst

RCR[2:0]=010b

16-Word Burst

RCR[2:0]=011b

Continuous Burst

RCR[2:0]=111b

Linear

0-1-2-3

0-1-2-3-4-5-6-7

0-1-2...14-15

0-1-2-3-4-5-6-...

1-2-3-0

1-2-3-4-5-6-7-0

1-2-3...14-15-0

1-2-3-4-5-6-7-...

2-3-0-1

2-3-4-5-6-7-0-1

2-3-4...15-0-1

2-3-4-5-6-7-8-...

3-0-1-2

3-4-5-6-7-0-1-2

3-4-5...15-0-1-2

3-4-5-6-7-8-9-...

4-5-6-7-0-1-2-3

4-5-6...15-0-1-2-3

4-5-6-7-8-9-10...

5-6-7-0-1-2-3-4

5-6-7...15-0-1...4

5-6-7-8-9-10-11...

6-7-0-1-2-3-4-5

6-7-8...15-0-1...5

6-7-8-9-10-11-12-...

7-0-1-2-3-4-5-6

7-8-9...15-0-1...6

7-8-9-10-11-12-13...

14-15-0-1...13

14-15-16-17-18-19-20-...

15-0-1-2-3...14

15-16-17-18-19-...

0-1-2-3

0-1-2-3-4-5-6-7

0-1-2...14-15

0-1-2-3-4-5-6-...

1-2-3-4

1-2-3-4-5-6-7-8

1-2-3...15-16

1-2-3-4-5-6-7-...

2-3-4-5

2-3-4-5-6-7-8-9

2-3-4...16-17

2-3-4-5-6-7-8-...

3-4-5-6

3-4-5-6-7-8-9-10

3-4-5...17-18

3-4-5-6-7-8-9-...

4-5-6-7-8-9-10-11

4-5-6...18-19

4-5-6-7-8-9-10...

5-6-7-8-9-10-11-12

5-6-7...19-20

5-6-7-8-9-10-11...

6-7-8-9-10-11-12-13

6-7-8...20-21

6-7-8-9-10-11-12-...

7-8-9-10-11-12-13-14

7-8-9...21-22

7-8-9-10-11-12-13...

14-15...28-29

14-15-16-17-18-19-20-...

15-16...29-30

15-16-17-18-19-20-21-...

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