When the supported standard is not 5G NR the control data interface is 32 bits with the fields shown in the following table for LDPC decode.
| Field | Bits | Range | Description |
|---|---|---|---|
| id | 31:24 | 0 to 255 | External block identifier to be passed through to status output |
| max_iterations | 23:18 | 1 to 63 | Maximum number of iterations |
| term_on_no_change | 17 | 0 or 1 |
0: Do not terminate early if there is no change in hard bits for the whole block (information and parity) between iterations 1: Terminate early if there is no change in hard bits for the whole block (information and parity) between iterations |
| term_on_pass | 16 | 0 or 1 |
0: Do not terminate early on passing parity check 1: Terminate early on passing parity check |
| include_parity_op | 15 | 0 to 1 |
0: Output systematic values only 1: Output systematic values and parity |
| hard_op | 14 | 0 to 1 |
0: Soft output 1: Hard output |
| - | 13:7 | - | Reserved |
| code | 6:0 | 0 to 127 | Code number (CODE) used to specify which set of LDPC code parameters are to be used on the block |