WED3DL328V View Datasheet(PDF) - White Electronic Designs Corporation

Part Name

Description

Manufacturer

WED3DL328V

8Mx32 SDRAM

White Electronic Designs Corporation 

White Electronic Designs

WED3DL328V

FIG. 2 MODE REGISTER DEFINITION

A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 Address Bus

Reserved* WB Op Mode CAS Latency BT Burst Length

Mode Register (Mx)

*Should program

M11, M10 = "0, 0"

to ensure compatibility

with future devices.

M2 M1 M0

000

001

010

011

100

101

110

111

Burst Length

M3 = 0

1

2

4

8

Reserved

Reserved

Reserved

Full Page

M3 = 1

1

2

4

8

Reserved

Reserved

Reserved

Reserved

M3

Burst Type

0

Sequential

1

Interleaved

M6 M5 M4

000

001

010

011

100

101

110

111

CAS Latency

Reserved

Reserved

2

3

Reserved

Reserved

Reserved

Reserved

M8

M7

M6-M0

Operating Mode

0

0

Defined

Standard Operation

-

-

-

All other states reserved

M9

Write Burst Mode

0

Programmed Burst Length

1

Single Location Access

BURST DEFINITION

Burst

Length

2

4

8

Full

Page

(y)

Starting Column

Address

A0

0

1

A1 A0

00

01

10

11

A2 A1 A0

000

001

010

011

100

101

110

111

n = A0-A11/9/8

(location 0-y)

Order of Accesses Within a Burst

Type = Sequential Type = Interleaved

0-1

0-1

1-0

1-0

0-1-2-3

1-2-3-0

2-3-0-1

3-0-1-2

0-1-2-3

1-0-3-2

2-3-0-1

3-2-1-0

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

Cn, Cn + 1, Cn + 2

Cn + 3, Cn + 4...

...Cn - 1,

Cn...

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

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

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

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

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

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

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

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

Not Supported

NOTES:

1. For full-page accesses: y = 2,048 (x4), y = 1,024 (x8), y = 512 (x16).

2. For a burst length of two, A1-A9, A11 (x4), A1-A9 (x8) or A1-A8 (x16) select the block-

of-two burst; A0 selects the starting column within the block.

3. For a burst length of four, A2-A9, A11 (x4), A2-A9 (x8) or A2-A8 (x16) select the block-

of-four burst; A0-A1 select the starting column within the block.

4. For a burst length of eight, A3-A9, A11 (x4), A3-A9 (x8) or A3-A8 (x16) select the block-

of-eight burst; A0-A2 select the starting column within the block.

5. For a full-page burst, the full row is selected and A0-A9, A11 (x4), A0-A9 (x8) or A0-A8

(x16) select the starting column.

6. Whenever a boundary of the block is reached within a given sequence above, the

following access wraps within the block.

7. For a burst length of one, A0-A9, A11 (x4), A0-A9 (x8) or A0-A8 (x16) select the unique

column to be accessed, and mode register bit M3 is ignored.

White Electronic Designs Corp. reserves the right to change products or specifications without notice.

June, 2002

Rev. 1

5

White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com

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