Byte
|
Bit
|
Query (from Host to Controller)
|
Answer (from Controller to Host)
|
Header |
7 |
Always 1 |
Always 1 |
6 |
1 - CONTROL byte to set supplied |
1 - CONTROL byte info supplied |
5 |
1 - STATUS byte to set supplied |
1 - STATUS byte info supplied |
4 |
1 - DATA byte to set supplied |
1 - DATA byte info supplied |
3 |
Always 1 |
Always 0 |
2 |
1 - CONTROL byte info requested |
Always 0 |
1 |
1 - STATUS byte info requested |
Always 0 |
0 |
1 - DATA byte info requested |
Always 0 |
Resource |
7-0 |
Optional DATA byte if Header's bit 4 is 1 |
Resource |
7-0 |
Optional STATUS byte if Header's bit 5 is 1 |
Resource |
7-0 |
Optional CONTROL byte if Header's bit 6 is 1 |