Station Address Logic: Multicast And Broadcast Packet Filtering; Station Address Logic: Unicast Packets - Digi NS7520B-1-C36 Hardware Reference Manual

N S 7 5 2 0 e r r a t a
Example
0xffb00010 = 80000001;
0xffb00010 = 80ffffff;
In this way, the two erroneous timeouts will occur with a small value, and the large
value can then be set.
Toggling TE (timer enable) to disable and re-enable the timer does not
Note:
eliminate this issue.

Station Address Logic: Multicast and broadcast packet filtering

The station address logic (SAL) in the MAC receiver does not filter multicast and
broadcast packets in a predictable manner.
Workaround
Program the Station Address Filter register (SAFR) fields as shown:
Mnemonic
PRO
PRM
PRA
BROAD
If filtering of multicast and broadcast packets is required, it must be provided by
software.

Station Address Logic: Unicast packets

The station address logic (SAL) in the MAC receiver does not compare the first byte of
the Ethernet destination address against the OCTET6 value in the Station Address
Register 3 (SA3) for unicast packets. As such, the SAL does not reject unicast packets
with mismatches only in this field.
3 1 0
Wait for the first TIP bit. Reset the TIP bit.
Wait for the first TIP bit. Reset the TIP bit.
Bit Value
D03 0
D02 1
D01 0
D00 1
N S 7 5 2 0 H a r d w a r e R e f e r e n c e , R e v G 9 / 2 0 0 7
Description
Disable promiscuous mode
Accept all multicast packets
Disable multicast hash table
Accept all broadcast packets