參數(shù)資料
型號(hào)： MT48LC4M16A2F4-6IT:G
元件分類(lèi)： DRAM
英文描述： 4M X 16 SYNCHRONOUS DRAM, 5.5 ns, PBGA54
封裝： 8 X 8 MM, VFBGA-54
文件頁(yè)數(shù)： 8/72頁(yè)
文件大小： 3455K
PDF: 09005aef80725c0b/Source: 09005aef806fc13c
Micron Technology, Inc., reserves the right to change products or specifications without notice.
64MSDRAM_2.fm - Rev. N 12/08 EN
16
2000 Micron Technology, Inc. All rights reserved.
64Mb: x4, x8, x16 SDRAM
Functional Description
Notes:
1. For full-page accesses: y = 1,024 (x4); y = 512 (x8); y = 256 (x16).
2. For BL = 2, A1–A9 (x4), A1–A8 (x8), or A1–A7 (x16) select the block-of-two burst; A0 selects
the starting column within the block.
3. For BL = 4, A2–A9 (x4), A2–A8 (x8), or A2–A7 (x16) select the block-of-four burst; A0–A1
select the starting column within the block.
4. For BL = 8, A3–A9 (x4), A3–A8 (x8), or A3–A7 (x16) select the block-of-eight burst; A0–A2
select the starting column within the block.
5. For a full-page burst, the full row is selected and
6. A0–A9 (x4), A0–A8 (x8), or A0–A7 (x16) select the starting column.
7. Whenever a boundary of the block is reached within a given sequence above, the following
access wraps within the block.
8. For BL = 1, A0–A9 (x4), A0–A8 (x8), or A0–A7 (x16) select the unique column to be accessed,
and mode register bit M3 is ignored.
CAS Latency
CL is the delay, in clock cycles, between the registration of a READ command and the
availability of the first piece of output data. The latency can be set to two or three clocks.
If a READ command is registered at clock edge n and the latency is m clocks, the data will
be available by clock edge n + m. The DQs will start driving as a result of the clock edge
one cycle earlier (n + m - 1), and provided that the relevant access times are met, the data
will be valid by clock edge n + m. For example, assuming that the clock cycle time is such
that all relevant access times are met, if a read command is registered at T0 and the
latency is programmed to two clocks, the DQs will start driving after T1 and the data will
be valid by T2, as shown in Figure 7 on page 17. Table 6 on page 17 indicates the oper-
ating frequencies at which each CL setting can be used.
Table 5:
Burst Definition
Burst
Length
Starting Column Address
Order of Accesses Within a Burst
Type = Sequential
Type = Interleaved
2A0
00-1
0-1
11-0
1-0
4A1
A0
0
0-1-2-3
0
1
1-2-3-0
1-0-3-2
1
0
2-3-0-1
1
3-0-1-2
3-2-1-0
8
A2A1A0
0
0-1-2-3-4-5-6-7
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
3-4-5-6-7-0-1-2
3-2-1-0-7-6-5-4
1
0
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
0
6-7-0-1-2-3-4-5
6-7-4-5-2-3-0-1
1
7-0-1-2-3-4-5-6
7-6-5-4-3-2-1-0
Full page (y)
n = A0–A9/8/7
(location 0–y)
Cn, Cn + 1, Cn + 2
Cn + 3, Cn + 4...
…Cn - 1, Cn…
Not supported
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