參數(shù)資料
型號(hào)： IBMN612804GT3B
廠商： IBM Microeletronics
英文描述： 128Mb Double Data Rate Synchronous DRAM(128M位高速CMOS同步動(dòng)態(tài)RAM（采用雙數(shù)據(jù)速率結(jié)構(gòu)）)
中文描述： 128Mb的雙數(shù)據(jù)速率同步DRAM（128兆位高速的CMOS同步動(dòng)態(tài)隨機(jī)存儲(chǔ)器（采用雙數(shù)據(jù)速率結(jié)構(gòu)））
文件頁(yè)數(shù)： 11/79頁(yè)
文件大?。?/td> 1324K
代理商： IBMN612804GT3B
IBMN612404GT3B
IBMN612804GT3B
Preliminary
128Mb Double Data Rate Synchronous DRAM
06K0566.F39350B
1/01
IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 11 of 79
Notes:
For a burst length of two, A1-A i selects the two-data-element block; A0 selects the first access within the
block.
For a burst length of four, A2-A i selects the four-data-element block; A0-A1 selects the first access within
the block.
For a burst length of eight, A3-A i selects the eight-data- element block; A0-A2 selects the first access
within the block.
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 starting 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.
Burst Definition
Burst Length
Starting Column Address
Order of Accesses Within a Burst
A2
A1
A0
Type = Sequential
Type = Interleaved
2
0
0-1
0-1
1
1-0
1-0
4
0
0
0-1-2-3
0-1-2-3
0
1
1-2-3-0
1-0-3-2
1
0
2-3-0-1
2-3-0-1
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
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