SMSC LAN9312 - Manual (Page 410)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
Revision 1.4 (08-19-08) 410 SMSC LAN9312
DATASHEET
10:9 Source Port B
When bit 8 is set, these bits indicate the source port on which the packet
was dropped.
00 = Port 0
01 = Port 1
10 = Port 2
11 = RESERVED
RC 00b
8 Set B Valid
When set, bits 14:9 are valid. RC 0b
7:4 Drop Reason A
When bit 1 is set, these bits indicate the reason a packet was dropped. See
the Drop Reason B description above for definitions of each value of this
field. RC 0h
3:2 Source port A
When bit 1 is set, these bits indicate the source port on which the packet
was dropped.
00 = Port 0
01 = Port 1
10 = Port 2
11 = RESERVED
RC 00b
1 Set A Valid
When set, bits 7:2 are valid. RC 0b
0 Interrupt Pending
When set, a packet dropped event(s) is indicated. RC 0b
BITS DESCRIPTION TYPE DEFAULT