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): 51/109頁
文件大?。?/td> 815K
代理商: L64381
Bus Interface Signals
3-11
PORT_BUSY Port Status
Output
In half-duplex mode (the DUPLEX field in Configuration
Register 0 is reset to zero), the L64381 asserts
PORT_BUSY to indicate the selected port is either trans-
mitting or receiving. In full-duplex mode, the L64381
asserts PORT_BUSY to indicate the port is transmitting.
PORT_NO[1:0] Port Number
Input
The state of these inputs determines to which port num-
ber [3:0] the READ_OUT_PKT and WRITE_IN_PKT
inputs and the ABORT_OUT output refer. The following
table shows the encoding of these inputs.
READ_OUT_PKT
Read Data from Receive FIFO
This input informs the L64381 to place the data in its
Receive FIFO on the Bus Interface. The PORT_NO bits
indicate which port’s FIFO is to be read.
Input
SOP
Start of Packet
Assertion of SOP indicates the Start Of Packet when it
occurs in the current data transfer.
Bidirectional
STROBE
Strobe
On the four cycles following the assertion of STROBE,
the L64381 places the status of Ports [3:0] respectively
on the PKT_AVAIL, BUF_AVAIL, and PORT_BUSY sig-
nals. If STROBE is held asserted, the status of each of
the four ports is placed on PKT_AVAIL, BUF_AVAIL, and
PORT_BUSY every four cycles.
Input
WRITE_IN_PKT Write Data to Transmit FIFO
This input informs the L64381 to write the data that is on
the Bus Interface to the Transmit FIFO. The PORT_NO
bits indicate which port’s Transmit FIFO is to be written.
Input
PORT_NO[1:0]
Port Number
00
01
10
11
0
1
2
3
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