CALC=CRC32
Sniffer Control
| EN | Enable sniffer |
| DMACH | DMA channel for Sniffer to observe |
| CALC | 0 (CRC32): Calculate a CRC-32 (IEEE802.3 polynomial) 1 (CRC32R): Calculate a CRC-32 (IEEE802.3 polynomial) with bit reversed data 2 (CRC16): Calculate a CRC-16-CCITT 3 (CRC16R): Calculate a CRC-16-CCITT with bit reversed data 14 (EVEN): XOR reduction over all data. == 1 if the total 1 population count is odd. 15 (SUM): Calculate a simple 32-bit checksum (addition with a 32 bit accumulator) |
| BSWAP | Locally perform a byte reverse on the sniffed data, before feeding into checksum. Note that the sniff hardware is downstream of the DMA channel byteswap performed in the read master: if channel CTRL_BSWAP and SNIFF_CTRL_BSWAP are both enabled, their effects cancel from the sniffer’s point of view. |
| OUT_REV | If set, the result appears bit-reversed when read. This does not affect the way the checksum is calculated; the result is transformed on-the-fly between the result register and the bus. |
| OUT_INV | If set, the result appears inverted (bitwise complement) when read. This does not affect the way the checksum is calculated; the result is transformed on-the-fly between the result register and the bus. |