Cirrus Logic EP93xx - Manual (Page 354)

9-52 DS785UM1
Copyright 2007 Cirrus Logic
1/10/100 Mbps Ethernet LAN Controller
EP93xx User’s Guide
9
9
9
5. Pause time = Transmit Pause Time (FCF) (2bytes)
6. Padding to complete minimum size packet.
7. CRC
AFP
Address:
0x8001_004C - Read/Write
Chip Reset:
0x0000_0000
Soft Reset:
0x0000_0000
Definition:
Address Filter Pointer Register
Bit Descriptions:
RSVD: Reserved. Unknown During Read.
AFP: Address Filter Pointer. The Address Filter Pointer controls
access to a block of storage which is used to hold MAC
addresses, and the destination address hash table. The
pointer defines which set of address match functions are
visible to the Host at offset 0x0050 through 0x005F.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
RSVD
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RSVD AFP
Table 9-5. Address Filter Pointer
AFP Data Accessed at Offset 0050 through 005F
000
This is the primary Individual Address, used in the recognition of Wake-up frames, as the
source address for transmit pause frames, and may be optionally used to qualify receive pause
frames.
001 This is a secondary MAC address that may be optionally used to qualify receive pause frames
010
011 These secondary addresses are only used for qualifying the destination addresses of receive
frames.
100
101
These locations are not implemented
110 This address is used as the destination address of transmit pause frames
111 This block comprises the hash table used for qualifying the destination of receive frames.