參數(shù)資料
型號(hào)： MT48LC4M16A2F4-6IT:G
元件分類： 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)： 14/72頁(yè)
文件大?。?/td> 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
21
2000 Micron Technology, Inc. All rights reserved.
64Mb: x4, x8, x16 SDRAM
Commands
The procedure for exiting self refresh requires a sequence of commands. First, CLK must
be stable (stable clock is defined as a signal cycling within timing constraints specified
for the clock pin) prior to CKE going back HIGH. After CKE is HIGH, the SDRAM must
have NOP commands issued (a minimum of two clocks) for tXSR, because time is
required for the completion of any internal refresh in progress.
Upon exiting the self refresh mode, AUTO REFRESH commands must be issued every
15.625s or less, as both SELF REFRESH and AUTO REFRESH utilize the row refresh
counter.
Self refresh is not supported on automotive temperature devices.
Operation
Bank/Row Activation
Before any READ or WRITE commands can be issued to a bank within the SDRAM, a row
in that bank must be “opened.” This is accomplished via the ACTIVE command, which
selects both the bank and the row to be activated (see Figure 8).
After opening a row (issuing an ACTIVE command), a READ or WRITE command may be
issued to that row, subject to the tRCD specification. tRCD (MIN) should be divided by
the clock period and rounded up to the next whole number to determine the earliest
clock edge after the ACTIVE command on which a READ or WRITE command can be
entered. For example, a tRCD specification of 20ns with a 125 MHz clock (8ns period)
results in 2.5 clocks, rounded to 3. This is reflected in Figure 9 on page 22, which covers
any case where 2 < tRCD (MIN)/tCK ≤ 3. (The same procedure is used to convert other
specification limits from time units to clock cycles).
A subsequent ACTIVE command to a different row in the same bank can only be issued
after the previous active row has been “closed” (precharged). The minimum time
interval between successive ACTIVE commands to the same bank is defined by tRC.
A subsequent ACTIVE command to another bank can be issued while the first bank is
being accessed, which results in a reduction of total row-access overhead. The minimum
time interval between successive ACTIVE commands to different banks is defined by
tRRD.
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參數(shù)描述
MT48LC4M16A2F4-75 制造商:Micron Technology Inc 功能描述:
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