Rev0.2, Aug. 2006

CMS3216LAx-75Ex

sequential and the interleaved burst types, and a full-page burst

is available for the sequential type. The full-page burst is used

in conjunction with the BURST TERMINATE command to gene-

rate arbitrary burst lengths. Reserved states should not be used,

as unknown operation or incompatibility with future versions

may result. When a READ or WRITE command is issued, a

block of columns equal to the burst length is effectively select-

ed. All accesses for that burst take place within this block,

meaning that the burst will wrap within the block if a boundary is

reached. The block is uniquely selected by A1-A8 when the

burst length is set to two; by A2-A8 when the burst length is

set to four; and by A3-A8 when the burst length is set to eight.

The remaining(least significant) address bit(s) is (are) used

to select the starting location within the block. Full-page

bursts wrap within the page if the boundary is reached.

Burst Type

The burst type can be set to either Sequential or Interleaved

by using the M3 bit in the Mode register. The ordering of

accesses within a burst is determined by the burst length, the

burst type and the starting column address, as shown in

Reserved

Reserved

1 0 1

Reserved

Reserved

1 1 0

8

8

0 1 1

Reserved

Reserved

1 0 0

2

2

0 0 1

4

4

0 1 0

Reserved

Full Page

1 1 1

1

1

0 0 0

M3=1

M3=0

Burst Length

M2 M1 M0

Reserved

1 1 1

Reserved

1 0 1

Reserved

1 1 0

3

0 1 1

Reserved

1 0 0

1

0 0 1

2

0 1 0

Reserved

0 0 0

CAS Latency

M6 M5 M4

Table 1. Mode Register Definition.

Interleaved

1

Sequential

0

Burst Type

M3

Prog. Burst Length

0

Single Mode Access

1

Write Burst Mode

M9

-

Defined

M6-M0

-

0

M7

All other states reserved

-

Standard Operation

0

Operating Mode

M8

Note :

4. For full-page accesses: y = 256

5. For a burst length of two, A1-A8 select the block-of-two burst; A0 selects the starting column within the block.

6. For a burst length of four, A2-A8 select the block-of-four burst; A0-A1 select the starting column within the block.

7. For a burst length of eight, A3-A8 select the block-of-eight burst; A0-A2 select the starting column within the block.

8. For a full-page burst, the full row is selected and A0-A8 select the starting column.

9. Whenever a boundary of the block is reached within a given sequence above, the following access wraps within the block.

10. For a burst length of one, A0-A8 select the unique column to be accessed,and mode register bit M3 is ignored.

Reserved(Set to ‘0’)

CAS Latency

M6-A6

M5-A5

M4-A4

BT

M3-A3

Burst Length

M2-A2

M1-A1

WB

M9-A9

Op Mode

M8-A8

M7-A7

M0-A0

M10-

A10

M11-

BS