參數(shù)資料
型號: 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): 71/109頁
文件大?。?/td> 815K
代理商: L64381
Processor Interface
4-15
Figure 4.11
Write-then-Read
Operations
4.4
Processor
Interface
The Processor Interface is used to configure the L64381, to read the port
statistics, and to read and write the internal registers of the L64381.
Since the statistics counters are a shared resource between the proces-
sor interface and the internal network interface, the internal network inter-
face has higher priority over the processor interface. The access time for
all processor accesses to the statistics counters may vary. Refer to the
description of CHIP_SELECT on page 3-12 for more information.
4.4.1
Reading the
L64381 Internal
Registers
The processor asserts the CHIP_SELECT, READ, and ADRS_STROBE
signals to read the internal registers of the L64381. When the chip
detects both ADRS_STROBE and CHIP_SELECT asserted, then on the
next rising edge of CLOCK, it latches in the address from the ADRS[5:0]
inputs, and latches in the instruction type from the READ input. The
L64381 asserts the PREADY signal for one cycle after it has placed the
read data onto the PDATA[15:0] bus.
DATA[31:0]
CLOCK
BYTE_VALID[3:0]
SOP
PORT_NO[1:0]
WRITE_IN_PKT
EOP
STROBE
BUF_AVAIL
00
2
PORT
0
0000
2
01
2
0000
2
PKT_AVAIL
READ_OUT_PKT
PORT
1
W
R
R
R
R
W
W
W
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