參數(shù)資料
型號(hào)： MT46V32M8BG-6AT:G
元件分類： DRAM
英文描述： 32M X 8 DDR DRAM, 0.7 ns, PBGA60
封裝： (8 X 14) MM, LEAD FREE,PLASTIC, FBGA-60
文件頁(yè)數(shù)： 59/93頁(yè)
文件大?。?/td> 3632K
PDF: 09005aef80768abb/Source: 09005aef82a95a3a
Micron Technology, Inc., reserves the right to change products or specifications without notice.
DDR_x4x8x16_Core2.fm - 256Mb DDR: Rev. O, Core DDR: Rev. B 1/09 EN
60
2003 Micron Technology, Inc. All rights reserved.
256Mb: x4, x8, x16 DDR SDRAM
Operations
Figure 26:
Example: Meeting tRCD (tRRD) MIN When 2 < tRCD (tRRD) MIN/tCK
≤ 3
READ
During the READ command, the value on input A10 determines whether or not auto
precharge is used. If auto precharge is selected, the row being accessed will be
precharged at the end of the READ burst; if auto precharge is not selected, the row will
remain open for subsequent accesses.
Note:
For the READ commands used in the following illustrations, auto precharge is dis-
abled.
During READ bursts, the valid data-out element from the starting column address will
be available following the CL after the READ command. Each subsequent data-out
element will be valid nominally at the next positive or negative clock edge (that is, at the
next crossing of CK and CK#). Figure 27 on page 62 shows the general timing for each
possible CL setting. DQS is driven by the DDR SDRAM along with output data. The
initial LOW state on DQS is known as the read preamble; the LOW state coincident with
the last data-out element is known as the read postamble.
Upon completion of a burst, assuming no other commands have been initiated, the DQ
will go High-Z. Detailed explanations of tDQSQ (valid data-out skew), tQH (data-out
window hold), and the valid data window are depicted in Figure 35 on page 70 and
Figure 36 on page 71. Detailed explanations of tDQSCK (DQS transition skew to CK) and
tAC (data-out transition skew to CK) are depicted in Figure 37 on page 72.
Data from any READ burst may be concatenated or truncated with data from a subse-
quent READ command. In either case, a continuous flow of data can be maintained. The
first data element from the new burst follows either the last element of a completed
burst or the last desired data element of a longer burst which is being truncated. The
new READ command should be issued x cycles after the first READ command, where x
equals the number of desired data element pairs (pairs are required by the 2n-prefetch
architecture). This is shown in Figure 28 on page 63. A READ command can be initiated
on any clock cycle following a previous READ command. Nonconsecutive read data is
illustrated in Figure 29 on page 64. Full-speed random read accesses within a page (or
pages) can be performed, as shown in Figure 30 on page 65.
Command
BA0, BA1
ACTACT
NOP
tRRD
tRCD
CK
CK#
Bank x
Bank y
Address
Row
NOP
RD/WR
NOP
Bank y
Col
NOP
T0
T1
T2
T3
T4
T5
T6
T7
Don’t Care
NOP
相關(guān)PDF資料
PDF描述
M29F800FB55N3E2 512K X 16 FLASH 5V PROM, 55 ns, PDSO48
MC12L1NZGF ROTARY SWITCH-12POSITIONS, SP12T, LATCHED, 0.25A, 28VDC, PANEL MOUNT-THREADED
MD00S1NCQF ROTARY SWITCH-6POSITIONS, DP6T, LATCHED, 0.25A, 28VDC, THROUGH HOLE-STRAIGHT
MD06L1NZGD ROTARY SWITCH-6POSITIONS, DP6T, LATCHED, 0.25A, 28VDC, PANEL MOUNT-THREADED
MD06L2NCQD ROTARY SWITCH-6POSITIONS, DP6T, LATCHED, 0.25A, 28VDC, THROUGH HOLE-STRAIGHT
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