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ETHERNET COMMUNICATION MODULE
RegisterHash Tables
302 Hardware Reference NS9215
Register
Register bit
assignment
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RegisterHash Tables
The MAC receiver provides the station address logic with a 6-bit CRC value that is
the upper six bits of a 32-bit CRC calculation performed on the 48-bit multicast
destination address. This 6-bit value addresses the 64-bit multicast hash table
created in HT1 (hash table 1) and HT2 (hash table 2). If the current receive frame is
a multicast frame and the 6-bit CRC addresses a bit in the hash table that is set to
1, the receive frame will be accepted; otherwise, the receive frame is rejected.
HT1 stores enables for the lower 32 CRC addresses; HT2 stores enables for the
upper 32 CRC addresses.
HT1 Address: A060 0504
Register bit assignment
Reserved
PRO BROAD
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
Reserved PRM PRA
Bits Access Mnemonic Reset Description
D31:04 N/A Reserved N/A N/A
D03 R/W PRO 0 Enable promiscuous mode; receive all frames
D02 R/W PRM 0 Accept all multicast frames
D01 R/W PRA 0 Accept multicast frames using the hash table
D00 R/W BROAD 0 Accept all broadcast frames
Bits Access Mnemonic Reset Description
D31:00 R/W HT1 0x00000000 CRC 31:00
HT1
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
HT1