NT5DS64M4AT Datasheet, PDF (11/78 Pages) List of Unclassifed Manufacturers – 256Mb Double Data Rate SDRAM

NT5DS64M4AT NT5DS64M4AW
NT5DS32M8AT NT5DS32M8AW
256Mb Double Data Rate SDRAM
Burst Definition
Burst Length
2
4
8
Starting Column Address
A2
A1
A0
0
1
0
0
0
1
1
0
1
1
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Order of Accesses Within a Burst
Type = Sequential
0-1
Type = Interleaved
0-1
1-0
1-0
0-1-2-3
0-1-2-3
1-2-3-0
1-0-3-2
2-3-0-1
2-3-0-1
3-0-1-2
3-2-1-0
0-1-2-3-4-5-6-7
0-1-2-3-4-5-6-7
1-2-3-4-5-6-7-0
1-0-3-2-5-4-7-6
2-3-4-5-6-7-0-1
2-3-0-1-6-7-4-5
3-4-5-6-7-0-1-2
3-2-1-0-7-6-5-4
4-5-6-7-0-1-2-3
4-5-6-7-0-1-2-3
5-6-7-0-1-2-3-4
5-4-7-6-1-0-3-2
6-7-0-1-2-3-4-5
6-7-4-5-2-3-0-1
7-0-1-2-3-4-5-6
7-6-5-4-3-2-1-0
Notes:
1. For a burst length of two, A1-A i selects the two-data-element block; A0 selects the first access within the block.
2. For a burst length of four, A2-A i selects the four-data-element block; A0-A1 selects the first access within the block.
3. For a burst length of eight, A3-A i selects the eight-data- element block; A0-A2 selects the first access within the block.
4. Whenever a boundary of the block is reached within a given sequence above, the following access wraps within the block.
Burst Type
Accesses within a given burst may be programmed to be either sequential or interleaved; this is referred to as the burst type
and is selected via bit A3. The ordering of accesses within a burst is determined by the burst length, the burst type and the start-
ing column address, as shown in Burst Definition on page 11.
Read Latency
The Read latency, or CAS latency, is the delay, in clock cycles, between the registration of a Read command and the availability
of the first burst of output data. The latency can be programmed 2 or 2.5 clocks.
If a Read command is registered at clock edge n, and the latency is m clocks, the data is available nominally coincident with
clock edge n + m.
Reserved states should not be used as unknown operation or incompatibility with future versions may result.
REV 1.1
12/2001
11
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NANYA TECHNOLOGY CORP. reserves the right to change Products and Specifications without notice.