AS4C8M16D1
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 5. Addressing Mode
A3
0
Addressing Mode
Sequential
1
Interleave
Burst Definition, Addressing Sequence of Sequential and Interleave Mode
Table 6. Burst Address ordering
Start Address
Burst
Length
Sequential
Interleave
A2
X
X
X
X
X
X
0
A1
X
X
0
0
1
A0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0, 1
1, 0
0, 1, 2, 3
1, 2, 3, 0
2, 3, 0, 1
3, 0, 1, 2
0, 1
1, 0
0, 1, 2, 3
1, 0, 3, 2
2, 3, 0, 1
3, 2, 1, 0
2
4
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
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
0
0
0
1
1
1
1
0
1
1
0
0
1
1
8
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 7. CAS Latency
A6
0
A5
0
A4
0
CAS Latency
Reserved
Reserved
2 clocks
0
0
1
0
1
0
0
1
1
3 clocks
1
0
0
Reserved
Reserved
2.5 clocks
Reserved
1
0
1
1
1
0
1
1
1
Alliance Memory Inc. Confidential
8
Rev. 1.1
Feb. /2009
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
