39.8.35 Tx Buffer Configuration
This register is write-restricted and only writable if bit fields CCCR.CCE = 1 and CCCR.INIT = 1.
Note: Be aware that the sum of TFQS and NDTB may not be greater than 32. There is no check
for erroneous configurations. The Tx Buffers section in the Message RAM starts with the
dedicated Tx Buffers.
| Name: | TXBC |
| Offset: | 0xC0 |
| Reset: | 0x00000000 |
| Property: | Write-restricted |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| TFQM | TFQS[5:0] | ||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | ||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| NDTB[5:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | |||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | |||
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| TBSA[15:8] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| TBSA[7:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
Bit 30 – TFQM Tx FIFO/Queue Mode
| Value | Description |
|---|---|
| 0 | Tx FIFO operation. |
| 1 | Tx Queue operation. |
Bits 29:24 – TFQS[5:0] Transmit FIFO/Queue Size
| Value | Description |
|---|---|
| 0 | No Tx FIFO/Queue. |
| 1 - 32 | Number of Tx Buffers used for Tx FIFO/Queue. |
| >32 | Values greater than 32 are interpreted as 32. |
Bits 21:16 – NDTB[5:0] Number of Dedicated Transmit Buffers
| Value | Description |
|---|---|
| 0 | No Tx FIFO/Queue. |
| 1 - 32 | Number of Tx Buffers used for Tx FIFO/Queue. |
| >32 | Values greater than 32 are interpreted as 32. |