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ETHERNET COMMUNICATION MODULE
Statistics registers
310 Hardware Reference NS9215
Transmit oversize
frame counter
(A060 0724)
Incremented for each transmitted frame that exceeds 1518 bytes (NON_VLAN) or
1532 bytes
(VLAN) and contains a valid FCS.
Transmit
undersize frame
counter (A060
0728)
Incremented for every frame less than 64 bytes, with a correct FCS value. This
counter also is incremented when a jumbo packet is aborted and the MAC is not
checking the FCS, because the frame is reported as having a length of 0 bytes.
Transmit
fragment counter
(A060 072C)
Incremented for every frame less than 64 bytes, with an incorrect FCS value.
General Statistics
registers address
map
These are the General Statistics registers.
Carry Register 1 (CAR1) and Carry Register 2 (CAR2) have carry bits for all of the
statistics counters. These carry bits are set when the associated counter reaches a
rollover condition.
These carry bits also can cause the STOVFL (statistics counter overflow) bit in the
Ethernet Interrupt Status register to be set. Carry Register 1 Mask register (CAM1)
and Carry Register 2 Mask register (CAM2) have individual mask bits for each of the
carry bits. When set, the mask bit prevents the associated carry bit from setting the
STOVFL bit.
Carry Register 1 Address: A060 0730
D31:12 R Reset = Read as 0 Reserved
D11:00 R/W Reset = 0x000 TOVR
D31:12 R Reset = Read as 0 Reserved
D11:00 R/W Reset = 0x000 TUND
D31:12 R Reset = Read as 0 Reserved
D11:00 R/W Reset = 0x000 TFRG
Address Register General registers R/W
A060_0730 CAR1 Carry Register 1 R
A060_0734 CAR2 Carry Register 2 R
A060_0738 CAM1 Carry Register 1 Mask register R/W
A060_073C CAM2 Carry Register 2 Mask register R/W