參數(shù)資料
型號(hào)： IBM13M64734BCA
廠商： IBM Microeletronics
英文描述： 64M x 72 1 Bank Registered/Buffered SDRAM Module(64M x 72 1組寄存/緩沖同步動(dòng)態(tài)RAM模塊)
中文描述： 64米× 72 1銀行注冊(cè)/緩沖內(nèi)存模組（64米× 72 1組寄存/緩沖同步動(dòng)態(tài)內(nèi)存模塊）
文件頁(yè)數(shù)： 17/20頁(yè)
文件大小： 499K
代理商： IBM13M64734BCA
IBM13M64734BCA
Preliminary
64M x 72 1 Bank Registered/Buffered SDRAM Module
19L7159.E93855
2/00
IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 17 of 20
Functional Description and Timing Diagrams
Refer to IBM 168 Pin SDRAM Registered DIMM Functional Description and Timing Diagrams (Document
01L5868) for registered-mode operation.
Refer to the IBM 256Mb Synchronous DRAM datasheet (Document 29L0000) for the functional description
and timing diagrams for buffered-mode operation.
Refer to the IBM Application Notes Serial Presence Detect on Memory DIMMsand SDRAM Presence Detect
Definitions for the Serial Presence Detect functional description and timings.
Presence Detect Read and Write Cycle
Symbol
Parameter
Min.
Max.
Units
Notes
f
SCL
SCL Clock Frequency
100
kHZ
T
I
Noise Suppression Time Constant at SCL, SDA Inputs
100
ns
t
AA
SCL Low to SDA Data Out Valid
0.3
3.5
μ
s
t
BUF
Time the Bus Must Be Free before a New Transmission Can Start
4.7
μ
s
t
HD:STA
Start Condition Hold Time
4.0
μ
s
t
LOW
Clock Low Period
4.7
μ
s
t
HIGH
Clock High Period
4.0
μ
s
t
SU:STA
Start Condition Setup Time (for a Repeated Start Condition)
4.7
μ
s
t
HD:DAT
Data In Hold Time
0
μ
s
t
SU:DAT
Data In Setup Time
250
ns
t
r
SDA and SCL Rise Time
1
μ
s
t
f
SDA and SCL Fall Time
300
ns
t
SU:STO
Stop Condition Setup Time
4.7
μ
s
t
DH
Data Out Hold Time
300
ns
t
WR
Write Cycle Time
15
ms
1
1. The write cycle time (t
WR
) is the time from a valid stop condition of a write sequence to the end of the internal erase/program cycle.
During the write cycle, the bus interface circuits are disabled, SDA is allowed to remain high per the bus-level pullup resistor, and
the device does not respond to its slave address.
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