參數(shù)資料
型號(hào)： W3H128M64E2-400SBC
廠商： WHITE ELECTRONIC DESIGNS CORP
元件分類(lèi)： DRAM
英文描述： DDR DRAM, PBGA208
封裝： 16 X 22 MM, 1 MM PITCH, PLASTIC, BGA-208
文件頁(yè)數(shù)： 3/31頁(yè)
文件大小： 989K
代理商： W3H128M64E2-400SBC
W3H128M64E-XSBX
11
White Electronic Designs Corporation (602) 437-1520 www.whiteedc.com
White Electronic Designs
October 2008
Rev. 1
ADVANCED
White Electronic Designs Corp. reserves the right to change products or specications without notice.
CAS LATENCY (CL)
The CAS latency (CL) is dened by bits M4–M6, as shown
in Figure 5. CL is the delay, in clock cycles, between the
registration of a READ command and the availability of the
rst bit of output data. The CL can be set to 4, 5 or 6 clocks,
depending on the speed grade option being used.
DDR2 SDRAM does not support any half-clock latencies.
Reserved states should not be used as unknown operation
or incompatibility with future versions may result.
DDR2 SDRAM also supports a feature called posted
CAS additive latency (AL). This feature allows the READ
command to be issued prior to tRCD (MIN) by delaying the
internal command to the DDR2 SDRAM by AL clocks.
An example of CL = 4 is shown in Figure 6; assume AL =
0. If a READ command is registered at clock edge n, and
the CL is m clocks, the data will be available nominally
coincident with clock edge n+m (this assumes AL = 0).
Burst length = 4
Posted CAS# additive latency (AL) = 0
Shown with nominal
t AC, tDQSCK, and tDQSQ
DON’T CARE
TRANSITIONING DATA
DOUT
n + 3
DOUT
n + 2
DOUT
n + 1
CK
CK#
COMMAND
DQ
DQS, DQS#
CL = 4 (AL = 0)
READ
T0
T1
T2
NOP
DOUT
n
T3
T4
T5
NOP
T6
NOP
FIGURE 6 – CAS LATENCY (CL)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
W3H128M64E-400SBI 制造商:Microsemi Corporation 功能描述:128M X 64 DDR2, 1.8V, 400MHZ, 208PBGA COMMERICAL TEMP. - Bulk
W3H128M72E-400SBC 制造商:Microsemi Corporation 功能描述:128M X 72 DDR2, 1.8V, 400MHZ, 208PBGA COMMERICAL TEMP. - Bulk
W3H128M72E-400SBI 制造商:Microsemi Corporation 功能描述:128M X 72 DDR2, 1.8V, 400MHZ, 208PBGA INDUSTRIAL TEMP. - Bulk 制造商:Microsemi Corporation 功能描述:SDRAM MEMORY
W3H128M72E-400SBM 制造商:Microsemi Corporation 功能描述:128M X 72 DDR2, 1.8V, 400MHZ, 208PBGA MIL-TEMP. - Bulk 制造商:Microsemi Corporation 功能描述:SDRAM MEMORY
W3H128M72E-533NBI 制造商:Microsemi Corporation 功能描述:128M X 72 DDR2, 1.8V, 533MHZ, 208PBGA IND TEMP. - Bulk
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