is42vm32200g Integrated Silicon Solution, Inc., is42vm32200g Datasheet - Page 6

• Manufacturer Part Number: is42vm32200g
• Description: 512k X 32bits X 4banks Low Power Synchronous Dram
• Manufacturer: Integrated Silicon Solution, Inc.

Figure4: Mode Register Definition
Table 3: Burst Definition
Burst Type
selected via bit M3. The ordering of accesses within a burst is determined by the burst length, the burst type and the starting column
address, as shown in Table 3.
M9
Length
Accesses within a given burst may be programmed to be either sequential or interleaved; this is referred to as the burst type and is
Burst
0
1
Note: M12/M11(BA1/BA0) must be set to “0/0” to select Mode Register (vs. the Extended Mode Register)
Page
Full
2
4
8
Burst Read and Burst Write
Burst Read and Single Write
Write Burst Mode
Starting Column
(Location 0-255)
A2
0
0
0
0
1
1
1
1
Address
n=A0-7
A1
0
0
1
1
0
0
1
1
0
0
1
1
0
12
BA1
A0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
11
BA0
Order of Access Within a Burst
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
C
C
n
Sequential
, C
…C
n
0
+3, C
10
0-1-2-3
1-2-3-0
2-3-0-1
3-0-1-2
n
n
A10
+1. C
-1, C
0-1
1-0
M6
0
0
0
0
1
1
1
1
WB
n
+4…
n
9
n
...
+2,
A9
M5
0
0
1
1
0
0
1
1
0
M4
8
0
1
0
1
0
1
0
1
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
A8
Not Supported
Interleaved
0-1-2-3
1-0-3-2
2-3-0-1
3-2-1-0
CAS Latency
0
7
0-1
1-0
Reserved
Reserved
Reserved
Reserved
Reserved
A7
2
3
-
6
CAS Latency
A6
5
A5
M3
0
1
4
Note :
1. For full-page accesses: y = 256
2. For a burst length of two, A1-A7 select the block-
3. For a burst length of four, A2-A7 select the block-
4. For a burst length of eight, A3-A7 select the
5. For a full-page burst, the full row is selected and A0-A7
6. Whenever a boundary of the block is reached within a
7. For a burst length of one, A0-A7 select the unique
A4
Burst Type
Sequential
of-two burst; A0 selects the starting column within the
block.
of-four burst; A0-A1 select the starting column within
the block.
block-of-eight burst; A0-A2 select the starting column
within the block.
select the starting column.
given sequence above, the following access wraps
within the block.
column to be accessed, and mode register bit M3 is
ignored.
Interleave
BT
3
A3
2
Burst Length
A2
1
A1
M2
0
0
0
0
1
1
1
1
0
A0
M1
0
0
1
1
0
0
1
1
M0
Address Bus
Mode Register (Mx)
0
1
0
1
0
1
0
1
IS42VM32200G
Reserved
Reserved
Reserved
Full Page
M3 = 0
1
2
4
8
Burst Length
Reserved
Reserved
Reserved
Reserved
M3 = 1
1
2
4
8
6