VG37648041AT datasheet(11/86 Pages) VML

Part #	VG37648041AT

Description	256M:x4, x8, x16 CMOS Synchronous Dynamic RAM

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Manufacturer	VML [Vanguard International Semiconductor]

Direct Link	http://www.vis.com.tw

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Document : 1G5-0157

Rev.1

Page 11

VIS

Preliminary

VG37648041AT

256M:x4, x8, x16

CMOS Synchronous Dynamic RAM

Table 1

BURST DEFINITION

NOTE:

1. For a burst length of two, A1-Ai selects the two-data-element block; A0 selects the first access within the block.

2. For a burst length of four, A2-Ai selects the four-data-element block; A0-A1 selects the first access within the block.

3. For a burst length of eight, A3-Ai selects the eight-data-element block; A0-A2 selects the first access within the block.

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

block.

Burst Length

Starting Column

Address:

Order of Accesses Within a Burst

2

A0

0

0-1

1

1-0

4

A1-A0

0

0-1-2-3

0 1

1-2-3-0

1-0-3-2

1 0

2-3-0-1

1 1

3-0-1-2

3-2-1-0

8

A2 A1 A0

0

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

0

1

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

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

0

1

0

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

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

0

1

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

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

1

0

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

1

0

1

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

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

1

0

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

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

1

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

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

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