AS4C4M16D1-5TIN datasheet(8/52 Pages) ALSC

Part #	AS4C4M16D1-5TIN

Description	Fully synchronous operation

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Manufacturer	ALSC [Alliance Semiconductor Corporation]

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AS4C4M16D1

Alliance Memory, lnc. Confidential

8

Rev. 1.0

May /2011

 Addressing Mode Select Field (A3)

The Addressing Mode can be one of two modes, either Interleave Mode or Sequential Mode. Both

Sequential Mode and Interleave Mode support burst length of 2, 4, and 8.

Table 6. Addressing Mode

A3

Addressing Mode

0

Sequential

1

Interleave



Burst Definition, Addressing Sequence of Sequential and Interleave Mode

Table 7: Burst Address ordering

Burst

Length

Start Address

Sequential

Interleave

A2

A1

A0

2

X

0

0, 1

X

1

1, 0

4

X

0

0, 1, 2, 3

X

0

1

1, 2, 3, 0

1, 0, 3, 2

X

1

0

2, 3, 0, 1

X

1

3, 0, 1, 2

3, 2, 1, 0

8

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

 CAS Latency Field (A6~A4)

This field specifies the number of clock cycles from the assertion of the Read command to the first read data.

The minimum whole value of CAS Latency depends on the frequency of CK. The minimum whole value

satisfying the following formula must be programmed into this field.

tCAC (min)

 CAS Latency X tCK

Table 8. CAS Latency

A6

A5

A4

CAS Latency

0

Reserved

0

1

Reserved

0

1

0

Reserved

0

1

3 clocks

1

0

Reserved

1

0

1

Reserved

1

0

Reserved

1

Reserved

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