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AS4C32M16D2 数据表(PDF) 39 Page - Alliance Semiconductor Corporation

部件名 AS4C32M16D2
功能描述  512M (32M x 16 bit) DDRII Synchronous DRAM
PDF  70 Pages
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制造商  ALSC [Alliance Semiconductor Corporation]
网页  https://www.alliancememory.com
标志 ALSC - Alliance Semiconductor Corporation

AS4C32M16D2 数据表(HTML) 39 Page - Alliance Semiconductor Corporation

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AS4C32M16D2
Alliance Memory Inc. 551 Taylor Way, San Carlos, CA 94070
TEL: (650) 610-6800
FAX: (650) 620-9211
Alliance Memory Inc. reserves the right to change products or specification without notice.
39
Rev. 1.1
Feb. /2013
Timing Waveforms
Figure 8. Initialization sequence after power-up
CK
CK#
tCH
CKE
Command
tCL
tIS
ODT
tIS
NOP
PRE
ALL
EMR
S
MRS
PRE
ALL
REF
REF
MRS
EMR
S
EMR
S
ANY
CMD
400ns
tRP
tMRD
tMRD
tRP
tMRD
Follow OCD Flowchart
tOIT
min 200 Cycle
DLL
ENABLE
DLL
RESET
OCD
Default
OCD
CAL.MOD
E EXIT
NOTE 1: To guarantee ODT off, VREF must be valid and a LOW level must be applied to the ODT pin.
tRFC
tRFC
Figure 9. OCD drive mode
CK#
Hi-Z
CK
DQS
DQS#
DQs HIGH for Drive(1)
CMD
OCD calibration mode exit
tOIT
Enter Drive mode
EMRS
NOP
NOP
NOP
EMRS
DQ
DQS HIGH & DQS# LOW for Drive(1), DQS LOW & DQS# HIGH for Drive(0)
DQs LOW for Drive(0)
tOIT
Hi-Z
NOTE : Drive mode, both Drive(1) and Drive(0), is used for controllers to measure DDR2 SDRAM Driver
impedance.In this mode, all outputs are driven out tOIT after "enter drive mode" command and all output
drivers are turned-off tOIT after "OCD calibration mode exit" command.



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