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2-10
Figure 2.5
Programmed I/O Target Transfers
Target Receive
Set Info. Transfer
Phase
(0xFC03 Bits [2:0]
Set Transfer
Counter in
Memory
Target Send Only
Write Data to
Output Data Reg.
(Reg. 0xFC00)
Target Send Only
Set Assert Data
Bus Bit
(Reg. 0xFC01, Bit 0)
Set Assert
REQ/ Bit
(0xFC03, Bit 3)
ACK/
Active?
(0xFC05, Bit 0)
Yes
Target Receive Only
Read Data from
SCSI Data Reg.
(Reg. 0xFC00)
Reset Assert
REQ/ Bit
(0xFC03, Bit 3)
A
Functional Description
Target Send
Set Info. Transfer
Phase
(0xFC03 Bits [2:0]
No
No
A
ACK/
No
Inactive?
(0xFC05, Bit 0)
Yes
Decrement
Transfer Counter
In Memory
Transfer
Counter
Equal Zero
?
Yes
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