DP83902A datasheet(32/70 Pages) NSC

32 / 70 page

100 Internal Registers (Continued)

103 REGISTER DESCRIPTIONS

(Continued)

RECEIVE CONFIGURATION REGISTER (RCR)

0CH (WRITE)

This register determines operation of the ST-NIC during reception of a packet and is used to program what types of packets to

76543210

MON

PRO

SEP

Bit

Symbol

Description

SEP

Save Errored Packets

0 Packets with receive errors are rejected

1 Packets with receive errors are accepted Receive errors are CRC and Frame Alignment

errors

Accept Runt Packets

This bit allows the receiver to accept packets that are smaller than 64

bytes The packet must be at least 8 bytes long to be accepted as a runt

0 Packets with fewer than 64 bytes rejected

1 Packets with fewer than 64 bytes accepted

Accept Broadcast

Enables the receiver to accept a packet with an all 1’s destination address

0 Packets with broadcast destination address rejected

1 Packets with broadcast destination address accepted

Accept Multicast

Enables the receiver to accept a packet with a multicast address All multicast

addresses must pass the hashing array

0 Packets with multicast destination address not checked

1 Packets with multicast destination address checked

PRO

Promiscuous Physical

Enables the receiver to accept all packets with a physical address

0 Physical address of node must match the station address programmed in PAR0 – PAR5

1 All packets with physical addresses accepted

MON

Monitor Mode

Enables the receiver to check addresses and CRC on incoming packets without

buffering to memory The Missed Packet Tally counter will be incremented for each recognized

packet

0 Packets buffered to memory

1 Packets checked for address match good CRC and Frame Alignment but not buffered to

memory

Reserved

Note

D2 and D3 are ‘‘OR’d’’ together ie if D2 and D3 are set the ST-NIC will accept broadcast and multicast addresses as well as its own physical address To

establish full promiscuous mode bits D2 D3 and D4 should be set In addition the multicast hashing array must be set to all 1’s in order to accept all multicast

addresses

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