For each byte of I/O
1. Read busy bit from status register until 0
2. Host sets read or write bit and if write copies data into data-out
register
3. Host sets command-ready bit
4. Controller sets busy bit, executes transfer
5. Controller clears busy bit, error bit, command-ready bit when
Operating System Concepts – 9
th Edition 13.9 Silberschatz, Galvin and Gagne ©2013
5. Controller clears busy bit, error bit, command-ready bit when
transfer done
For each byte of I/O1. Read busy bit from status register until 02. Host sets read or write bit and if write copies data into data-out register3. Host sets command-ready bit4. Controller sets busy bit, executes transfer5. Controller clears busy bit, error bit, command-ready bit when Operating System Concepts – 9th Edition 13.9 Silberschatz, Galvin and Gagne ©20135. Controller clears busy bit, error bit, command-ready bit when transfer done
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