Datasheet
•
Burst Definition, Addressing Sequence of Sequential and Interleave Mode
Table 5. Burst Definition
Burst
Length
Start Address
Sequential
Interleave
A2
A1
A0
2
X
X
0
0, 1
0, 1
X
X
1
1, 0
1, 0
4
X
0
0
0, 1, 2, 3
0, 1, 2, 3
X
0
1
1, 2, 3, 0
1, 0, 3, 2
X
1
0
2, 3, 0, 1
2, 3, 0, 1
X
1
1
3, 0, 1, 2
3, 2, 1, 0
8
0
0
0
0, 1, 2, 3, 4, 5, 6, 7
0, 1, 2, 3, 4, 5, 6, 7
0
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
1
3, 4, 5, 6, 7, 0, 1, 2
3, 2, 1, 0, 7, 6, 5, 4
1
0
0
4, 5, 6, 7, 0, 1, 2, 3
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
1
0
6, 7, 0, 1, 2, 3, 4, 5
6, 7, 4, 5, 2, 3, 0, 1
1
1
1
7, 0, 1, 2, 3, 4, 5, 6
7, 6, 5, 4, 3, 2, 1, 0
Full page
location = 0-255
n, n+1, n+2, n+3, …255, 0,
1, 2, … n-1, n, …
Not Support
9 No-Operation command (RAS# = "H", CAS# = "H", WE# = "H")
The No-Operation command is used to perform a NOP to the SDRAM which is selected (CS# is
Low). This prevents unwanted commands from being registered during idle or wait states.
10 Burst Stop command (RAS# = "H", CAS# = "H", WE# = "L")
The Burst Stop command is used to terminate either fixed-length or full-page bursts. This
command is only effective in a read/write burst without the auto precharge function. The terminated
read burst ends after a delay equal to the CAS latency (refer to the following figure). The termination
of a write burst is shown in the following figure.
Figure 16. Termination of a Burst Read Operation
(Burst Length
＞
4, CAS# Latency = 2, 3)
CLK
T0 T1
COMMAND
T2 T3 T4 T5 T6 T7 T8
CAS# latency=2
t
CK2,
DQ
CAS# latency=3
t
CK3,
DQ
The burst ends after a delay equal to the CAS# latency
NOPNOP
READ A
DOUT A
0
DOUT A
0
DOUT A
1
NOP
DOUT A
1
DOUT A
2
Burst
Stop
NOP
DOUT A
3
DOUT A
2
NOP
DOUT A
3
NOP NOP
AS4C4M32SA-6TIN
AS4C4M32SA-6TCN
AS4C4M32SA-7TCN
Confidential
-15/47-
Rev.1.0 Sep.2015