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Software Developer’s Manual 353
Register Descriptions
Table 13-117. PRC1023 Register Bit Description
13.7.26 Packets Received (1024 to Max Bytes) Count
PRC1522 (04070h; R)
This register counts the number of good packets received that are from 1024 bytes to the maximum
(from <Destination Address> through <CRC>, inclusively) in length. The maximum is dependent
on the current receiver configuration and the type of packet being received. If a packet is counted in
Receive Oversized Count, it is not counted in this register (see Section 13.7.36). This register does
not include received flow control packets and only increments if the packet has passed address
filtering and receives are enabled.
Due to changes in the standard for maximum frame size for VLAN tagged frames in IEEE
Standard 802.3, these Ethernet controllers accept packets which have a maximum length of 1522
bytes. The RMON statistics associated with this range has been extended to count 1522-byte long
packets.
Table 13-118. PRC1522 Register Bit Description
13.7.27 Good Packets Received Count
GPRC (04074h; R)
This register counts the number of good packets received of any legal length. The legal length for
the received packet is defined by the value of LongPacketEnable (CTRL.LPE) (see Section
13.7.15). This register does not include received flow control packets and only counts packets that
pass filtering. This register only increments if receives are enabled. This register does not count
packets counted by the Missed Packet Count (MPC) register.
31 0
PRC1023
Field Bit(s)
Initial
Value
Description
PRC1023 31:0 0b Number of packets received that are 512-1023 bytes in length.
31 0
PRC1522
Field Bit(s)
Initial
Value
Description
PRC1522 31:0 0b Number of packets received that are 1024-Max bytes in length.