BL702/704/706 Reference Manual
17.8.6 COLLCONFIG
Address：0x4000d01c
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
RSVD MAXRET
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RSVD COLLVAL
Bits
Name Type Reset Description
31:20 RSVD
19:16 MAXRET R/W 4’hF Maximum retry
This field specifies the maximum number of consequential
retransmission attempts after the collision is detected.
When the maximum number has been reached, the TX
MAC reports an error and stops transmitting the current
packet.
According to the Ethernet standard, the MAXRET default
value is set to 0xf (15).
15:6 RSVD
5:0 COLLVAL R/W 6’h3F Collision valid
This field specifies a collision time window. A collision that
occurs later than the time window
is reported as a ”Late Collisions” and transmission of the
current packet is aborted.
17.8.7 TX_BD_NUM
Address：0x4000d020
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
RSVD RXBDPTR RSVD TXBDPTR
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RSVD TXBDNUM
Bits
Name Type Reset Description
31 RSVD
30:24 RXBDPTR R 7’h0 RX buffer descriptors (BD) pointer, pointing at the RXBD
currently being used
BL702/704/706 Reference Manual 301/ 375
@2021 Bouffalo Lab
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