Tx Buffer Cancellation Request
| CR0 | Cancellation Request 0 |
| CR1 | Cancellation Request 1 |
| CR2 | Cancellation Request 2 |
| CR3 | Cancellation Request 3 |
| CR4 | Cancellation Request 4 |
| CR5 | Cancellation Request 5 |
| CR6 | Cancellation Request 6 |
| CR7 | Cancellation Request 7 |
| CR8 | Cancellation Request 8 |
| CR9 | Cancellation Request 9 |
| CR10 | Cancellation Request 10 |
| CR11 | Cancellation Request 11 |
| CR12 | Cancellation Request 12 |
| CR13 | Cancellation Request 13 |
| CR14 | Cancellation Request 14 |
| CR15 | Cancellation Request 15 |
| CR16 | Cancellation Request 16 |
| CR17 | Cancellation Request 17 |
| CR18 | Cancellation Request 18 |
| CR19 | Cancellation Request 19 |
| CR20 | Cancellation Request 20 |
| CR21 | Cancellation Request 21 |
| CR22 | Cancellation Request 22 |
| CR23 | Cancellation Request 23 |
| CR24 | Cancellation Request 24 |
| CR25 | Cancellation Request 25 |
| CR26 | Cancellation Request 26 |
| CR27 | Cancellation Request 27 |
| CR28 | Cancellation Request 28 |
| CR29 | Cancellation Request 29 |
| CR30 | Cancellation Request 30 |
| CR31 | Cancellation Request 31 |