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Ethernet Communication Module
RX Free Buffer register
Address: A060 0A3C
So the RX_RD logic knows when the software is freeing a buffer for reuse, the
software writes to the RXFREE register each time it frees a buffer in one of the pools.
RXFREE has an individual bit for each pool; this bit is set to 1 when the register is
written. Reads to RXFREE always return all 0s.
Register bit assignment
Bits Access Mnemonic Reset Description
D31:04 N/A Reserved N/A N/A
D03 W RXFREED 0 Pool D free bit
D02 W RXFREEC 0 Pool C free bit
D01 W RXFREEB 0 Pool B free bit
D00 W RXFREEA 0 Pool A free bit
Table 250: RX Free Buffer register
Reserved
RX
FREED
RX
FREEA
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
Reserved
RX
FREEC
RX
FREEB