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DP83936AVF Datasheet(PDF) 43 Page - National Semiconductor (TI) |
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DP83936AVF Datasheet(HTML) 43 Page - National Semiconductor (TI) |
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43 / 104 page  60 SONIC-T Registers (Continued) 643 Receive Control Register (RAk50l e 2h) This register is used to filter incoming packets and provide status information of accepted packets (Figure 6-6) Setting any of bits 15 – 11 to a ‘‘1’’ enables the corresponding receive filter If none of these bits are set only packets which match the CAM Address registers are accepted Bits 10 and 9 control the loopback operations After reception bits 8 – 0 indicate status information about the accepted packet and are set to ‘‘1’’ when the corresponding condition is true If the packet is accepted all bits in the RCR are written into the RXpktstatus field Bits 8 – 6 and 3 – 0 are cleared at the reception of the next packet This register is unaffected by a software reset 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 ERR RNT BRD PRO AMC LB1 LB0 MC BC LPKT CRS COL CRCR FAER LBK PRX rw rw rw rw rw rw rw r r r r r r r r r reread only rwereadwrite FIGURE 6-6 Receive Control Register Field Meaning ERR ACCEPT PACKET WITH ERRORS RNT ACCEPT RUNT PACKETS BRD ACCEPT BROADCAST PACKETS PRO PHYSICAL PROMISCUOUS PACKETS AMC ACCEPT ALL MULTICAST PACKETS LB0LB1 LOOPBACK CONTROL MC MULTICAST PACKET RECEIVED BC BROADCAST PACKET RECEIVED LPKT LAST PACKET IN RBA CRS CARRIER SENSE ACTIVITY COL COLLISION ACTIVITY CRCR CRC ERROR FAER FRAME ALIGNMENT ERROR LBK LOOPBACK PACKET RECEIVED PRX PACKET RECEIVED OK Bit Description 15 ERR ACCEPT PACKET WITH CRC ERRORS OR COLLISIONS 0 Reject all packets with CRC errors or when a collision occurs 1 Accept packets with CRC errors and ignore collisions 14 RNT ACCEPT RUNT PACKETS 0 Normal address match mode 1 Accept runt packets (packets less than 64 bytes in length) Note A hardware reset clears this bit 13 BRD ACCEPT BROADCAST PACKETS 0 Normal address match mode 1 Accept broadcast packets (packets with addresses that match the CAM are also accepted) Note This bit is cleared upon hardware reset 12 PRO PHYSICAL PROMISCUOUS MODE Enable all Physical Address packets to be accepted 0 normal address match mode 1 promiscuous mode 11 AMC ACCEPT ALL MULTICAST PACKETS 0 normal address match mode 1 enables all multicast packets to be accepted Broadcast packets are also accepted regardless of the BRD bit (Broadcast packets are a subset of multicast packets) http www nationalcom 43 |
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