AS4C64M8D1 datasheet(9/64 Pages) ALSC

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AS4C64M8D1

Confidential

Rev.

2.0

Oct. /2014

 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

Addressing Mode

Sequential

Interleave



Burst Definition, Addressing Sequence of Sequential and Interleave Mode

Table 7. Burst Address ordering

Burst Length

Start Address

Sequential

Interleave

0, 1

1, 0

0, 1, 2, 3

1, 2, 3, 0

1, 0, 3, 2

2, 3, 0, 1

3, 0, 1, 2

3, 2, 1, 0

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

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

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

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

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

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

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

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

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

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

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

6, 7, 4, 5, 2, 3, 0, 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

CAS Latency

Reserved

2 clocks

3 clocks

Reserved

2.5 clocks

Reserved

 Test Mode field (A8~A7)

These two bits are used to enter the test mode and must be programmed to "00" in normal operation.

Table 9. Test Mode

Test Mode

Normal mode

DLL Reset

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