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參數(shù)資料
| 型號(hào)： | L64381 |
| 廠商： | LSI Corporation |
| 英文描述： | 4-Port Ethernet Controller(四端口以太網(wǎng)控制器) |
| 中文描述： | 4端口以太網(wǎng)控制器（四端口以太網(wǎng)控制器） |
| 文件頁(yè)數(shù)： | 39/109頁(yè) |
| 文件大?。?/td> | 815K |
| 代理商： | L64381 |
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Transmit EOP Counters
2-23
Figure 2.28
Receive EOP Counter 0
Figure 2.29
Receive EOP Counter 1
2.13
Transmit EOP
Counters
Figures 2.30 and 2.31 show the Transmit EOP Counters. These counters
count the number of EOPs that are present in the Transmit FIFO. The
port increments the counter when the Bus Interface receives an end of
a packet from the bus (EOP is asserted), and decrements the counter
when the end of packet is sent to the port for transmission. Similar to the
Receive EOP Counter, this scheme guarantees that a packet is transmit-
ted when the packet size is smaller than the Transmit Threshold field.
Note that this transmit can occur because the L64381 allows automatic
padding of packets. This scheme permits better use of the Transmit
FIFO, since no padding of data is needed to align it with the Transmit
Threshold, hence FIFO space is not wasted with pad data. Register 0
contains the counter values for Ports 0 and 1, and Register 1 contains
the counter values for Ports 2 and 3.
Figure 2.30
Transmit EOP
Counter 0
Figure 2.31
Transmit EOP
Counter 1
15
13 12
8
7
5
4
0
Reserved
RCOUNT1
Reserved
RCOUNT0
15
13 12
8
7
5
4
0
Reserved
RCOUNT3
Reserved
RCOUNT2
15
13 12
8
7
5
4
0
Reserved
TCOUNT1
Reserved
TCOUNT0
15
13 12
8
7
5
4
0
Reserved
TCOUNT3
Reserved
TCOUNT2
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