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参数资料
| 型号： | W110 |
| 英文描述： | Controller Miscellaneous - Datasheet Reference |
| 中文描述： | 控制器杂项-数据表参考 |
| 文件页数： | 14/20页 |
| 文件大小： | 383K |
| 代理商： | W110 |
I
W110 Dual-Speed Ethernet Controller
I
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14
Oki Semiconductor
Statistics Gathering and Vectors
Most activity in a MAC is centered around major events such as completion of packet reception or com-
pletion of packet transmission attempts. When these major events occur, the W110 generates a statistics
vector, summarizing the detailed results associated with the event. The vector can be latched into a sepa-
rate statistics collection block. A vector is latched once for each major event.
This vector approach reduces the requirement for individual synchronization of many individual events.
The approach also reduces the gate count by eliminating the need for flip-flops scattered around the MAC
design.
When multiple-MAC designs are involved, the statistics collecting block may be common for all MACs.
Again, the vector approach reduces the complexity of the design and the gate count. Central statistics
gathering is also easier than distributed gathering when it comes to parsing cumulative and derivative sta-
tistics.
There are generally two different vectors, one for receive and one for transmit. Vectors may be designed
to include or exclude as many different parameters as a customer requires. Examples of vectors and
parameters are shown in the following table.
In the above implementation example, the transmit vector is 26 bits long and the receive vector is 21 bits
long. Vector implementations are not limited to these parameters or lengths.
Statistics Vector Parameters
Transmit Status Bit
Receive Status Bit
Transmit Status Bit
Bi
t
Meaning
Bi
t
Meaning
Bit
Meaning
Bi
t
Meaning
25
Transmit OK.
12
Collision count bit 0.
20
Carrier event previously
seen.
10
Packet length bit 10.
24
TX abort - late collision.
11
Late collision.
19
Rxdv event previously
seen.
9
Packet length bit 9.
23
TX abort - excessive
deferral.
10
Transmit byte count bit
10.
18
Receive OK.
8
Packet length bit 8.
22
TX abort - excessive
collisions.
9
Transmit byte count bit 9.
17
Broadcast packet.
7
Packet length bit 7.
21
TX abort due to under-
run.
8
Transmit byte count bit 8.
16
Multicast packet.
6
Packet length bit 6.
20
TX abort - jumbo.
7
Transmit byte count bit 7.
15
CRC error.
5
Packet length bit 5.
19
Packet deferred.
6
Transmit byte count bit 6.
14
Dribble nibble.
4
Packet length bit 4.
18
Broadcast packet
transmitted.
5
Transmit byte count bit 5.
13
Receive code violation.
3
Packet length bit 3.
17
Multicast packet
transmitted.
4
Transmit byte count bit 4.
12
Long packet.
2
Packet length bit 2.
16
CRC error.
3
Transmit byte count bit 3.
11
Short packet.
1
Packet length bit 1.
15
Collision count bit 3.
2
Transmit byte count bit 2.
—
—
0
Packet length bit 0.
14
Collision count bit 2.
1
Transmit byte count bit 1.
—
—
—
—
13
Collision count bit 1.
0
Transmit byte count bit 0.
—
—
—
—
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