© 1996 Microchip Technology Inc.

DS21056F-page 11

24AA65

FIGURE 8-2:

CACHE WRITE TO THE ARRAY STARTING AT A PAGE BOUNDARY

FIGURE 8-3:

CACHE WRITE TO THE ARRAY STARTING AT A NON-PAGE BOUNDARY

1 Write command initiated at byte 0 of page 3 in the array;

First data byte is loaded into the cache byte 0.

2 64 bytes of data are loaded into cache.

3 Write from cache into array initiated by STOP bit.

Page 0 of cache written to page 3 of array.

Write cycle is executed after every page is written.

4 Remaining pages in cache are written

to sequential pages in array.

cache

byte 0

cache

byte 1

• • •

cache

byte 7

cache page 1

bytes 8-15

• • •

page 0

cache page 2

bytes 16-23

cache page 7

bytes 56-63

page 1 page 2

• • •

byte 7

• • •

page 4

• • •

page 7

page 3

cache page 0

Last page in cache written to page 2 in next row.

5

array row n

array row n + 1

page 0 page 1 page 2

byte 0

byte 1

page 4

page 7

1 Write command initiated; 64 bytes of data

loaded into cache starting at byte 2 of page 0.

2 Last 2 bytes loaded 'roll over'

to beginning.

3

Last 2 bytes

loaded into

page 0 of cache.

4 Write from cache into array initiated by STOP bit.

Page 0 of cache written to page 3 of array.

Write cycle is executed after every page is written.

cache

byte 1

cache

byte 2

• • •

cache

byte 7

cache page 1

bytes 8-15

• • •

page 0

cache page 2

bytes 16-23

cache page 7

bytes 56-63

page 1 page 2

• • •

• • •

page 4

• • •

page 7

page 3

Remaining bytes in cache are

written sequentially to array.

5

array

row n

array

row

n + 1

cache

byte 0

Last 3 pages in cache written to next row in array.

6

page 1 page 2

byte 0

byte 2

byte 1

page 4

page 7

byte 7

byte 3

byte 4

page 0