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參數(shù)資料
| 型號： | BR34L02FV-W |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | 256? bit Electrically Erasable PROM |
| 中文描述： | 256？位電可擦除可編程ROM |
| 文件頁數(shù)： | 15/25頁 |
| 文件大?。?/td> | 529K |
| 代理商： | BR34L02FV-W |
BR34L02FV-W
Memory ICs
3) Acknowledge polling
Since the device ignore all input commands during the internal write cycle, no ACK will be returned.
When the master send the next command after the write command, if the device returns the ACK, it means that the
program is completed. If no ACK is returned, it means that the device is still busy.
By using Acknowledge polling, the waiting time is minimized less than t
WR
=5ms.
In case of operating Write or Current Read right after Write, first, send the slave address (R/W is “HIGH” or “LOW”
respectively). After the device returns the ACK, continue word address input or data output respectively.
Rev.A
15/24
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WRITE COMMAND
SLAVE
ADDRESS
SLAVE
ADDRESS
SLAVE
ADDRESS
SLAVE
ADDRESS
WORD
ADDRESS
DATA
t
WR
t
WR
Fig.20 SUCCESSIVE WRITE OPERATION BY ACKNOWLEDGE POLLING
During the internal write cycle,
no ACK will be returned.
(ACK
=
HIGH)
After the internal write cycle
is completed ACK will be returned
(ACK
=
LOW). Then input next
Word Address and data.
THE FIRST WRITE COMMAND
THE SECOND WRITE COMMAND
4) Command cancellation by start and stop condition
During a command input, it is canceled by the successive inputs of start condition and stop condition. (Fig.21)
But during ACK or data output, the device may output the SDA line LOW. In such cases, operation of start and stop
condition is impossible, so that the reset can’t work. Execute the software reset in the cases. (See Page14)
Operating the command cancel by start and stop condition during the command of Random Read or Sequential
Read or Current Read, internal address counter is not confirmed.
Therefore operation of Current Read after this is not valid. Operate a Random Read in this case.
Fig.21 COMMAND CANCELLATION BY START AND STOP CONDITION
DURING THE INPUT OF SLAVE ADDRESS
1
1
0
0
SCL
SDA
START
CONDITION
STOP
CONDITION
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相關(guān)代理商/技術(shù)參數(shù) |
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| BR34L02FV-W_09 | 制造商:ROHM 制造商全稱:Rohm 功能描述:DDR1/DDR2 For memory module) SPD Memory |
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| BR34L02-W | 制造商:ROHM 制造商全稱:Rohm 功能描述:2Kbit Serial I2C BUS EEPROM For SPD DRAM Memory Module |
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