參數(shù)資料
型號: PCI1520-EP
英文描述: Military Enhanced Plastic PC Card Controllers Data Manual
中文描述: 軍事增強塑料PC卡控制器數(shù)據(jù)手冊
文件頁數(shù): 41/125頁
文件大小: 716K
代理商: PCI1520-EP
3
13
S
b6
b4
b5
b3 b2 b1 b0
0
b7 b6 b5
b4 b3
b2
b1 b0
A
A
Slave Address
Word Address
R/W
S/P = Start/Stop Condition
A = Slave Acknowledgement
b7
b6
b4
b5
b3 b2 b1 b0
A
P
Data Byte
Figure 3
11. Serial-Bus Protocol
Byte Write
Figure 3
12 illustrates a byte read. The read protocol is very similar to the write protocol, except the R/W command
bit must be set to 1 to indicate a read-data transfer. In addition, the PCI1520 master must acknowledge reception
of the read bytes from the slave transmitter. The slave transmitter drives the SDA signal during read data transfers.
The SCL signal remains driven by the PCI1520 master.
S
b6
b4
b5
b3 b2 b1 b0
0
b7 b6 b5
b4 b3
b2
b1 b0
A
A
Slave Address
Word Address
R/W
S
b6
b4
b5
b3 b2 b1 b0
1
A
Slave Address
S/P = Start/Stop Condition
M = Master Acknowledgement
b7 b6
b4
b5
b3 b2 b1 b0
M
P
Data Byte
Start
Restart
R/W
A = Slave Acknowledgement
Stop
Figure 3
12. Serial-Bus Protocol
Byte Read
Figure 3
13 illustrates EEPROM interface doubleword data collection protocol.
S
1
1
0
0
0
0
0
0
b7 b6 b5 b4 b3
b2 b1 b0
A
A
Slave Address
Word Address
R/W
Data Byte 2
Data Byte 1
Data Byte 0
M
P
M
M
M = Master Acknowledgement
S/P = Start/Stop Condition
A = Slave Acknowledgement
Data Byte 3
M
S
1
1
0
0
0
0
0
1
A
Restart
R/W
Slave Address
Start
Figure 3
13. EEPROM Interface Doubleword Data Collection
3.6.3
Serial-Bus EEPROM Application
When the PCI bus is reset and the serial-bus interface is detected, the PCI1520 attempts to read the subsystem
identification and other register defaults from a serial EEPROM. The registers and corresponding bits that can be
loaded with defaults through the EEPROM are provided in Table 3
7.
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