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): 66/109頁
文件大?。?/td> 815K
代理商: L64381
4-10
L64381 Operation
Figure 4.6
Read Data with
ABORT_IN
Assertion
The arbitration chip receives the assertion of the PKT_AVAIL signal and
grants the request by asserting the READ_OUT_PKT and PORT_NO[1:0]
signals. In response to these inputs, the Bus-Out State Machine drives
the DATA[31:0], BYTE_VALID[3:0], SOP, and EOP signals. After the state
machine writes the Bus Transfer Size number of words, it 3-states the
DATA[31:0], BYTE_VALID[3:0], SOP, and EOP signals.
Because the arbitration chip knows that the L64381 only drives the bus
for Bus Transfer Size cycles, it can pipeline the READ_OUT_PKT and
PORT_NO[1:0] signals to different devices to ensure minimum idle cycles.
4.3.2
Bus-In State
Machine
There are four Bus-In State Machines on the chip, one per Ethernet port.
The Bus-In State Machine is responsible for receiving data that is to be
transmitted on the Ethernet. When the state machine detects that the
Transmit FIFO has at least as many empty locations as specified by the
Bus Transfer Size, it drives the BUF_AVAIL signal active for the corre-
sponding port. This signal is multiplexed onto the BUF_AVAIL device out-
put in the same manner as the PKT_AVAIL signal. Figure 4.7 shows the
timing relationship between the STROBE and BUF_AVAIL signals.
CLOCK
BYTE_VALID[3:0]
SOP
DATA[31:0]
PORT_NO[1:0]
READ_OUT_PKT
EOP
STROBE
PKT_AVAIL
PORT PORT PORT PORT
0
1
2
3
0x0
1111
2
ABORT_IN
0000
2
0000
2
ABORT_IN
Assertion Window
D
D
D
D
00
2
01
2
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