W332M72V-100BC WEDC [White Electronic Designs Corporation], W332M72V-100BC Datasheet - Page 5

• Manufacturer Part Number: W332M72V-100BC
• Description: 32Mx72 Synchronous DRAM
• Manufacturer: WEDC [White Electronic Designs Corporation]

March 2006
Rev. 3
FIGURE 3 – MODE REGISTER DEFINITION
to ensure compatibility
M12, M11, M10 = 0, 0
with future devices.
*Should program
Reserved*
A
12
Reserved*
A
11
A
10
WB
M9
0
1
A
White Electronic Designs
9
Op Mode
A
8
A
7
Programmed Burst Length
M8
CAS Latency
0
-
Single Location Access
A
Write Burst Mode
6
M7
A
0
-
5
A
4
BT
M3
0
1
Defined
M6-M0
A
-
3
M6
M2
Burst Length
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
A
M5
M1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
2
M0
M4
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Operating Mode
Standard Operation
All other states reserved
A
1
A
Reserved
Reserved
Reserved
Full Page
0
M3 = 0
Interleaved
Burst Type
Sequential
1
2
4
8
Mode Register (Mx)
Address Bus
Burst Length
CAS Latency
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
2
3
Reserved
Reserved
Reserved
Reserved
M3 = 1
1
2
4
8
5
NOTES:
1. For full-page accesses: y = 1,024.
2. For a burst length of two, A1-9 select the block-of-two burst; A0 selects the starting
3. For a burst length of four, A2-9 select the block-of-four burst; A0-1 select the starting
4. For a burst length of eight, A3-9 select the block-of-eight burst; A0-2 select the
5. For a full-page burst, the full row is selected and A0-9 select the starting column.
6. Whenever a boundary of the block is reached within a given sequence above, the
7. For a burst length of one, A0-9 select the unique column to be accessed, and Mode
Length
Burst
Page
Full
column within the block.
column within the block.
starting column within the block.
following access wraps within the block.
Register bit M3 is ignored.
(y)
2
4
8
White Electronic Designs Corporation • [phone] • www.wedc.com
Starting Column
A2
TABLE 1 – BURST DEFINITION
0
0
0
0
1
1
1
1
(location 0-y)
Address
n = A 0-9
A1
A1
0
0
1
1
0
0
1
1
0
0
1
1
A0
A0
A0
0
1
0
1
1
0
1
0
1
0
1
0
1
0
Type = Sequential
Cn, Cn + 1, Cn + 2
Cn + 3, Cn + 4...
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
Order of Accesses Within a Burst
W332M72V-XBX
…Cn - 1,
0-1-2-3
1-2-3-0
2-3-0-1
3-0-1-2
Cn…
0-1
1-0
Type = In ter leaved
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
Not Supported
0-1-2-3
1-0-3-2
2-3-0-1
3-2-1-0
0-1
1-0