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Two-Wire Serial Interface Operation
2-19
Figure 2.11 Two-Wire Serial Slave Data Transmit and Receive
No
ACK Received?
(LRB = 1?)
AAS
Bit Set?
(0xFC03 Bit 2)
Read
or Write?
(LSB = 1 or 0)
PIN Bit = 0
?
Yes
Read Byte from
Control/Status
Register
No
Read Device
Address From Data
Register
Yes
Interrupt Service
Routine
No
Read Byte From
Control/Status
Register
Read Byte From
Control/Status
Register
PIN Bit = 0?
Yes
No
Stop
Detected?
(STS = 1?)
Read Data From
Data Register
End Receive
R/W = 0
R/W = 1
Read Last Data
Byte From Data
Register
PIN Bit = 0?
Yes
No
Write Data to Data
Register
End Transmit
Write Dummy Byte
(0xFF) to Data
Register
Yes
No
Yes
No
PIN deactivated
(set to 1),
SYM53C040
goes into slave
receiver mode
Slave Receive
Slave Transmit
Содержание Symbios SYM53C040
Страница 12: ...xii Preface...
Страница 90: ...4 18 SCSI and DMA Registers...
Страница 98: ...5 8 SFF 8067 Registers...
Страница 110: ...6 12 Two Wire Serial Registers...
Страница 126: ...7 16 Miscellaneous Registers...
Страница 160: ...8 34 System Registers...
Страница 184: ...9 24 Electrical Characteristics...
Страница 194: ...A 10 Register Summary...
Страница 214: ......