參數(shù)資料
型號(hào)： IBM11N8845HB
廠商： IBM Microeletronics
英文描述： 8M x 72 Chip-Kill Protect ECC-on-DIMM Module(8M x 72 帶糾錯(cuò)代碼保護(hù)的小外形雙列直插動(dòng)態(tài)RAM模塊)
中文描述： 8米× 72片，殺死保護(hù)ECC的上內(nèi)存模塊（8米× 72帶糾錯(cuò)代碼保護(hù)的小外形雙列直插動(dòng)態(tài)內(nèi)存模塊）
文件頁(yè)數(shù)： 26/29頁(yè)
文件大?。?/td> 497K
代理商： IBM11N8845HB
IBM11N8845HB
8M x 72 Chip-Kill Protect ECC-on-DIMM Module
Preliminary
IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 26 of 29
75H5486
GA14-4641-00
Revised 11/96
Presence Detect (EEPROM) Bus Timing
SCL
SDA
IN
t
SU:STO
t
HD:STA
t
SU:STA
t
AA
SDA
OUT
t
F
t
LOW
t
HIGH
t
R
t
SU:DAT
t
HD:DAT
t
BUF
t
DH
Presence Detect Operation
Clock and Data Conventions
: Data states on the
SDA line can change only during SCL low. SDA
state changes during SCL HIGH are reserved for
indicating start and stop conditions (Figure 1 & Fig-
ure 2).
Start Condition
: All commands are preceded by
the start condition, which is a HIGH to LOW transi-
tion of SDA when SCL is high. The serial PD device
continuously monitors the SDA and SCL lines for
the start condition and will not respond to any com-
mand until this condition has been met.
Stop Condition
: All communications are termi-
nated by a stop condition, which is a LOW to HIGH
transition of SDA when SCL is HIGH. The stop con-
dition is also used to place the serial PD device into
standby power mode.
Acknowledge
: Acknowledge is a software conven-
tion used to indicate successful data transfers. The
transmitting device, either master or slave, will
release the bus after transmitting eight bits. During
the ninth clock cycle the receiver will pull the SDA
line LOW to acknowledge that it received the eight
bits of data (Figure 3).
The PD device will always respond with an acknowl-
edge after recognition of a start condition and its
slave address. If both the device and a write opera-
tion have been selected, The PD device, will re-
spond with an acknowledge after the receipt of each
subsequent eight bit word. In the read mode the PD
device will transmit eight bits of data, release the
SDA line and monitor the line for an acknowledge. If
an acknowledge is detected and no stop condition is
generated by the master, the slave will continue to
transmit data. If an acknowledge is not detected, the
slave will terminate further data transmissions and
await the stop condition to return to standby power
mode.
Figure 1. Data Window
Figure 2. Definition of Start & Stop
Figure 3. Acknowledge Response From Receiver
SCL
SDA
Data
Change
Data Stable
Data Stable
SCL
SDA
Start
Bit
Stop
Bit
Acknowledge
SCL from
Master
Data Output
from Trans
Data Output
from Receiver
8
9
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