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參數(shù)資料
| 型號： | 91C94 |
| 廠商： | SMSC Corporation |
| 英文描述： | ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM |
| 中文描述： | 的ISA / PCMCIA的單芯片以太網(wǎng)控制器與RAM |
| 文件頁數(shù)： | 57/120頁 |
| 文件大?。?/td> | 447K |
| 代理商： | 91C94 |
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41
I/O SPACE - BANK0
OFFSET
6
NAME
COUNTER REGISTER
TYPE
READ ONLY
SYMBOL
ECR
Counts four parameters for MAC statistics. When any counter reaches 15 an interrupt is issued. All
counters are cleared when reading the register and do no wrap around beyond 15.
HIGH
BYTE
NUMBER OF EXCESS DEFERRED TX
NUMBER OF DEFERRED TX
0
LOW
BYTE
MULTIPLE COLLISION COUNT
SINGLE COLLISION COUNT
0
Each four bit counter is incremented every time
the corresponding event, as defined in the EPH
STATUS REGISTER bit description, occurs.
Note that the counters can only increment once
per enqueued transmit packet, never faster,
limiting the rate of interrupts that can be
generated by the counters. For example if a
packet is successfully transmitted after one
collision the SINGLE COLLISION COUNT field
is incremented by one. If a packet experiences
between 2 to 16 collisions, the MULTIPLE
COLLISION COUNT field is
incremented
by
one.
If
a
packet experiences deferral the
NUMBER
OF
DEFERRED
TX
field
is
incremented
by
one,
even
if
the
packet
experienced
multiple
deferrals
during
its
collision retries.
The
COUNTER
REGISTER
facilitates
maintaining statistics in the AUTO RELEASE
mode
where
no
transmit
interrupts
are
generated on successful transmissions.
Reading the register in the transmit service
routine will be enough to maintain statistics.
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