
MB81ES653225-12/-12L
16
11. FULL COLUMN BURST AND BURST STOP COMMAND (BST)
The full column burst is an option of burst length and available only at sequential mode of burst type. This full
column burst mode is repeatedly access to the same row. If burst mode reaches the end of column address,
then it wraps around to the first column address (
=
0) and continues to count until interrupted by the new read
(READ) /write (WRIT) , precharge (PRE) , or burst stop (BST) commands. The selection of Auto-precharge
option is illegal during the full column burst operation.
The BST command is applicable to terminate the burst operation. If the BST command is asserted during the
burst mode, its operation is terminated immediately and the internal state moves to Bank Active.
When a read mode is interrupted by the BST command, the output will be in High-Z. For the detailed rule, please
refer to “8. READ INTERRUPTED BY BURST STOP (EXAMPLE @CL
=
2, BL
=
Full Column” in section “
■
TIM-
ING DIAGRAMS”. When a write mode is interrupted by the BST command, the data to be applied at the same
time with the BST command will be ignored.
12. BURST READ & SINGLE WRITE
The burst read and single write mode provides single word write operation regardless of its burst length. In this
mode, burst read operation does not be affected by this mode.
13. PROGRAMMABLE PAGE LENGTH FUNCTION
The programmable page length function provides lower operation current than regular SDRAM. Page length is
selected by Mode Register Set, and row address field and column address field are defined for selected page
length as below.
Burst
Length
Starting Column
Address
A
2
A
1
A
0
Sequential Mode
Interleave Mode
2
X X 0
0
1
1
0
0
1
1
0
X X 1
4
X 0 0
0
1
2
3
1
2
3
0
2
3
0
1
3
0
1
2
0
1
2
3
1
0
3
2
2
3
0
1
3
2
1
0
X 0 1
X 1 0
X 1 1
8
0 0 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 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
Row address
A
12
to A
0
A
13
to A
0
A
14
to A
0
Column address
A
6
to A
0
A
5
to A
0
A
4
to A
0
128 page length
64 page length
32 page length