38.6.6.6 Mixed Dedicated Tx Buffers / Tx Queue

In this case the Tx Buffers section in the Message RAM is subdivided into a set of Dedicated Tx Buffers and a Tx Queue. The number of Dedicated Tx Buffers is configured by TXBC.NDTB bits (TXBC <21:16>). The number of Tx Queue Buffers is configured by TXBC.TFQS bits (TXBC <29:24>). In case TXBC.TFQS bits (TXBC <29:24>) is programmed to zero, only Dedicated Tx Buffers are used.

Figure 38-11. Example of mixed Configuration Dedicated Tx Buffers / Tx Queue

Tx prioritization:

  • Scan all Tx Buffers with activated transmission request
  • Tx Buffer with lowest Message ID gets highest priority and is transmitted next