A3V56S30FTP View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

A3V56S30FTP

256M Single Data Rate Synchronous DRAM

Unspecified 

A3V56S30FTP

A3V56S40FTP

256M Single Data Rate Synchronous DRAM

MODE REGISTER FIELD TABLE TO PROGRAM MODES

Register Programmed with Normal MRS

Address BA0 BA1 A12 A11 A10/AP A9 A8 A7 A6 A5 A4 A3 A2 A1 A0

Function

0

0

0

0

0

WB 0

0

CAS Latency

BT

Burst Length

MRS Mode

CAS Latency

A6 A5 A4

00 0

00 1

01 0

01 1

10 0

10 1

11 0

11 1

Latency

Reserved

Reserved

2

3

Reserved

Reserved

Reserved

Reserved

Burst Type

A3

Type

0

Sequential

1

Interleave

Burst Length

A2 A1 A0

000

001

010

011

100

101

110

111

BT=0

1

2

4

8

Reserved

Reserved

Reserved

Full Page

BT=1

1

2

4

8

Reserved

Reserved

Reserved

Reserved

Write Burst Mode

A9

Type

0

Programmed Burst Length

1

Single Location Access

BURST SEQUENCE

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 - A9 (x8)

N=A0 - A8 (x16)

(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

NOTE:

1. For full-page accesses: y = 1023 (x8), 511 (x16).

2. For a burst length of two, A1–A9(A8) select the block-of-two burst; A0 selects the starting column within the block.

3. For a burst length of four, A2–A9(A8) select the block-of-four burst; A0–A1 select the starting column within the block.

4. For a burst length of eight, A3–A9(A8) 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(A8) 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(A8) select the unique column to be accessed, and mode register bit A3 is ignored.

Revision 1.1

Page 14 / 39

Mar., 2010

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