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SMH4042ASALN 参数 Datasheet PDF下载

SMH4042ASALN图片预览
型号: SMH4042ASALN
PDF下载: 下载PDF文件 查看货源
内容描述: 分布式电源热插拔控制器的CompactPCI [Distributed Power Hot-Swap Controller for CompactPCI]
分类和应用: 控制器PC
文件页数/大小: 28 页 / 1819 K
品牌: SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
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SMH4042A  
SequentialRead  
Random Address Read  
Random address Read operations allow the Master to Sequential Reads can be initiated as either a current  
access any memory location in a random fashion. This address Read or a random access Read. The first word  
operation involves a two-step process. First, the Master is transmitted as with the other byte read modes (current  
issues a write command which includes the start condi- address byte Read or random address byte Read).  
tion and the Slave address field (with the R/W bit set to However, the Master now responds with an Acknowl-  
edge, indicating that it requires additional data from the  
This procedure sets the internal address counter of the SMH4042A. The SMH4042A continues to output data for  
SMH4042Atothedesiredaddress. Afterthewordaddress  
Write) followed by the address of the word it is to read.  
each Acknowledge received. The Master terminates the  
Acknowledge is received by the Master, it immediately sequentialReadoperationwithaNACKandissuesaStop  
reissues a start condition followed by another Slave condition. During a sequential read operation the internal  
addressfieldwiththeR/WbitsettoRead. TheSMH4042A  
address counter is automatically incremented with each  
will respond with an Acknowledge and then transmit the Acknowledge signal. For read operations all address bits  
8 data bits stored at the addressed location. At this point areincremented,allowingtheentirearraytobereadusing  
the Master sets SDA high (NACK) and generates a Stop a single Read command. After a count of the last memory  
condition. TheSMH4042Adiscontinuesdatatransmission  
and reverts to its standby power mode.  
address the address counter will roll-over and the  
memory will continue to output data.  
S
T
N S  
A
R
T
R
/
W
A
C
K
A T  
C O  
K P  
Optional  
Master  
SDA  
x x x  
x x x x x x x x  
x x  
x x  
R
1 0 1 0  
A
C
K
Slave  
2070 Fig09  
Figure 9. Basic Read  
S
T
A
R
T
S
T
O
P
R
/
W
Master  
SDA  
x x x  
x x x x x x x x  
x x  
x x  
1 0 1 0  
W
A
C
K
A
C
K
A
C
K
Slave  
2070 Fig10  
Figure 10. Basic Write  
SUMMIT MICROELECTRONICS, Inc.  
2070 9.1 5/27/03  
13  
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