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| 型号： | MB8504S064AF-84 |
| 厂商： | Fujitsu Limited |
| 英文描述： | CMOS 4M×64Bit Synchronous Dynamic Random Access Memory (SDRAM)(CMOS 4M×64位 同步动态RAM) |
| 中文描述： | 4米× 64位的CMOS同步动态随机存取存储器（SDRAM）的CMOS（4分× 64位同步动态RAM）的 |
| 文件页数： | 14/20页 |
| 文件大小： | 388K |
| 代理商： | MB8504S064AF-84 |
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MB8504S064AF-100/-84/-67
I
SERIAL PRESENCE DETECT(SPD) FUNCTION
1. PIN DESCRIPTIONS
SCL (Serial Clock)
SCL input is used to clock all data input/output of SPD
SDA (Serial Data)
SDA is a common pin used for all data input/output of SPD. The SDA pull-up resistor is required due to the
open-drain output.
SA
0
, SA
1
, SA
2
(Address)
Address inputs are used to set the least significant three bits of the eight bits slave address. The address inputs
must be fixed to select a particular module and the fixed address of each module must be different each other.
2. SPD OPERATIONS
CLOCK and DATA CONVENTION
Data states on the SDA can change only during SC L= Low. SDA state changes during SCL = High are indicated
start and stop conditions. Refer to Fig. 1 below.
START CONDITION
All commands are preceded by a start condition, which is a transition of SDA state from High to Low when SCL
= High. SPD will not respond to any command until this condition has been met.
STOP CONDITION
All read or write operation must be terminated by a stop condition, which is a transition of SDA state from Low
to High when SCL = High. The stop condition is also used to make the SPD into the state of standby power
mode after a read sequence.
START
Fig. 1 – START AND STOP CONDITIONS
STOP
SCL
SDA
START = High to Low transition of SDA state when SCL is High
STOP = Low to High transition of SDA state when SCL is High
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相关代理商/技术参数 |
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|---|---|
| MB8508S064CE-100 | 制造商:FUJITSU 制造商全称:Fujitsu Component Limited. 功能描述:8 M x 64 BIT SYNCHRONOUS DYNAMIC RAM SO-DIMM |
| MB85101BAN | 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:HIGH FREQUENCY CERAMIC CAPACITORS |
| MB85101BBN | 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:HIGH FREQUENCY CERAMIC CAPACITORS |
| MB85101CAN | 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:HIGH FREQUENCY CERAMIC CAPACITORS |
| MB85101CBN | 制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:HIGH FREQUENCY CERAMIC CAPACITORS |
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