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X24042S8M-3 参数 Datasheet PDF下载

X24042S8M-3图片预览
型号: X24042S8M-3
PDF下载: 下载PDF文件 查看货源
内容描述: 串行E2PROM [Serial E2PROM]
分类和应用: 可编程只读存储器
文件页数/大小: 15 页 / 64 K
品牌: XICOR [ XICOR INC. ]
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X24042  
Page Write  
Flow 1. ACK Polling Sequence  
The X24042 is capable of a sixteen byte page write  
operation. It is initiated in the same manner as the byte  
writeoperation,butinsteadofterminatingthewritecycle  
after the first data word is transferred, the master can  
transmit up to seven more words. After the receipt of  
each word, the X24042 will respond with an acknowl-  
edge.  
WRITE OPERATION  
COMPLETED  
ENTER ACK POLLING  
ISSUE  
START  
After the receipt of each word, the three low order  
addressbitsareinternallyincrementedbyone. Thehigh  
order eight bits of the word address remain constant.  
The master should not transmit more than eight words  
prior to generating the stop condition. As with the byte  
write operation, all inputs are disabled until completion  
of the internal write cycle. Refer to Figure 6 for the  
address, acknowledge and data transfer sequence.  
ISSUE SLAVE  
ADDRESS AND R/W = 0  
ISSUE STOP  
ACK  
NO  
RETURNED?  
Acknowledge Polling  
YES  
The disabling of the inputs can be used to take advan-  
tage of the typical 5 ms write cycle time. Once the stop  
condition is issued to indicate the end of the host’s write  
operation the X24042 initiates the internal write cycle.  
ACK polling can be initiated immediately. This involves  
issuing the start condition followed by the slave address  
for a write operation. If the X24042 is still busy with the  
write operation no ACK will be returned. If the X24042  
has completed the write operation an ACK will be  
returned and the host can then proceed with the next  
read or write operation. Refer to Flow 1.  
NEXT  
NO  
OPERATION  
A WRITE?  
YES  
ISSUE STOP  
PROCEED  
ISSUE BYTE  
ADDRESS  
PROCEED  
3849 FHD F11  
Figure 6. Page Write  
S
T
S
T
O
P
SLAVE  
ADDRESS  
A
R
T
BUS ACTIVITY:  
MASTER  
WORD ADDRESS n  
DATA n  
DATA n+1  
DATA n+15  
SDA LINE  
S
P
A
C
K
A
C
K
A
C
K
A
C
K
A
C
K
BUS ACTIVITY:  
X24042  
NOTE: In this example n = xxxx 000 (B); x = 1 or 0  
3849 FHD F12  
6
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