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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） |
| 文件頁數(shù)： | 85/109頁 |
| 文件大?。?/td> | 815K |
| 代理商： | L64381 |
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Accessing the Statistics Counters
6-5
6.3
Accessing the
Statistics
Counters
This section details the three types of instructions that access the
Statistics Counters: read, burst read, and write.
6.3.1
Reading the
Statistics
Counters
The following steps describe how to read a single Statistics Counter:
1.
Load the Statistics Counter number to be read (use the Write Statis-
tics Counters Address Register instruction).
2.
Execute the Read Single Statistics Counter instruction. When in
autoincrement mode, this instruction causes the Statistics Counters
Address Register to autoincrement it’s value after the read has been
performed.
3.
Read the least-significant halfword from Statistics Counters Data-Out
Register 0.
4.
Read the most-significant halfword from Statistics Counters Data-Out
Register 1.
The data read is placed into the PDATA[15:0] bus. Because the Statistics
FIFO is 32-bits wide and the PDATA[15:0] bus is 16-bits wide, two Read
Single Statistics Counter instructions are executed. These instructions
facilitate reads of statistics from the L64381 if the processor is not
capable of performing burst mode read operations.
6.3.2
Writing the
Statistics
Counters
The following steps describe how to write a single Statistics Counter:
1.
Load the Statistics Counter number to be written (use the Write
Statistics Counters Address Register instruction).
2.
Load the least-significant halfword into Statistics Counters Data-In
Register 0.
3.
Load the most-significant halfword into Statistics Counters Data-In
Register 1.
4.
Execute the Write Single Statistics Counter instruction. This instruc-
tion causes the data in the Statistics Counters Data-In Registers to
be loaded into the Statistics FIFO, and the address in the Statistics
Counters Address Register to be autoincremented. This feature is
provided in autoincrement mode to reduce the number of instructions
needed to test the Statistics Counters.
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