CHAPTER 3 FUNCTIONAL OUTLINE
PRELIMINARY
NEC confidential and Proprietary
94
(3) Performance monitoring counter
The 32-bit performance monitoring counters that totalize the number of times each event for a cell reception has
occurred are provided to each port as shown in Table 3-16. The host can recognize these counts by reading
data from the register.
Table 3-16. Performance Monitoring Counters
Counter Type
Counter Name
Count Item
B1 error counter
Number of bits or frames detected B1 errors
B2 error counter
Number of bits or frames detected B2 errors
B3 error counter
Number of bits or frames detected B3 errors
Line REI counter
Number of bits or frames detected Line REI errors
Line monitor
counters
Path REI counter
Number of bits or frames detected Path REI errors
Transmit valid cell counter
Number of cells transmitted from the transmit FIFO to the line.
Receive valid cell counter
Number of received cells transferred from the receive FIFO to the
ATM interface
Receive idle cell counter
Number of received invalid cells dropped internally
HEC error drop cell counter
Number of cells discarded due to the HEC verification
Note
HEC correct cell counter
Number of cells modified due to the HEC verification
Note
Cell counters
Receive FIFO full drop cell
counter
Number of dropped cells due to receive FIFO overflow
Transmit valid packet counter
Number of packets or bytes transmitted from the transmit FIFO to the
line
Transmit abort packet counter
Number of abort packets transmitted from the transmit FIFO to the
line
Transmit FIFO underflow packet
counter
Number of abort packets transmitted due to transmit FIFO underflow
Receive valid packet counter
Number of received packets or bytes transferred from the receive
FIFO to the POS interface
Receive abort packet counter
Number of received abort packets transferred from the receive FIFO
to the POS interface
Receive address error packet
counter
Number of address error packets dropped internally
Receive FCS error packet
counter
Number of FCS error packets transferred from the receive FIFO to the
POS interface
Receive FIFO overflow packet
counter
Number of packets which the receive FIFO overflow occurs while a
packet is being received
Receive long packet counter
Number of long packets due to long size packet error
Packet
counters
Receive short packet counter
Number of short packets due to short size packet error
Note:
The HEC drop cell counter and HEC Correct counter operate differently depending on the mode setting of
HEC error control by the MDATMR registers.
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