Rainbow Electronics W90N740 - Manual (Page 97)

W90N740
Publication Release Date: November 26, 2004
- 93 - Revision A4
MAC Missed Packet Count register (MPCNT_0, MPCNT_1)
The value in the MAC Missed Packet Count register (MPCNT) indicates the number of packets that were
discarded due to various types of errors. Together with status information on packets transmitted and
received, the MPCNT and these two pause count registers provide the information required for station
management.
Users can read the MPCNT to get current missed packet counter value and clears the register (read
clear). It is the responsibility of software to maintain a global count with more bits of precision.
However, users can write the MPCNT to set the initial value of counter overflow and start to count.
The counter overflow value ranges from 0x0000 to 0xFFFF (default value: 0x7FFF). It sets the
corresponding bit (MMP) in the MISTA and generates an interrupt if overflow is occurred and the
corresponding interrupt enable bit is set.
Register Address R/W Description Reset Value
MPCNT_0 0xFFF0.3098 R/W Missed Packet counter register 0x0000.7FFF
MPCNT_1 0xFFF0.3898 R/W Missed Packet counter register 0x0000.7FFF
31 30 29 28 27 26 25 24
Reserved
23 22 21 20 19 18 17 16
Reserved
15 14 13 12 11 10 9 8
MPCNT
7 6 5 4 3 2 1 0
MPCNT
MPCNT [15:0]: MAC Missed Packet Count
Default value: 0x7FFF
It indicates the number of packets that were discarded due to various types of errors.
This counter indicates the following kinds of error:
Dribbling Bits error count (AECnt): The number of packets received with alignment errors. The
counter will be increment at the end of packet reception if the MISTA indicates the
alignment errors.
Frame discarded error count (RXFDCnt): The number of packets discarded by MAC because of
receive FIFO overflows, or because the RxON bit is cleared. This count does not include
the number of packets rejected by the CAM.
CRC error count (CECnt): The number of packets received with a CRC error. The counter will be
increment at the end of packet reception if the MISTA indicates the CRC errors.