參數(shù)資料
型號(hào)： 21440
廠商： Intel Corp.
英文描述： Multiport 10/100Mb/s Ethernet Controller(多端口10/100Mb/s 以太網(wǎng)控制器)
中文描述： 多端口10/100Mb/s以太網(wǎng)控制器（多端口支持10/100Mbps以太網(wǎng)控制器）
文件頁數(shù)： 66/92頁
文件大?。?/td> 1352K
代理商： 21440
21440 Multiport 10/100Mb/s Ethernet Controller
6-9
Network Interface Operation
6.7.2
External Loopback Mode
The external loopback mode enables verification that the logic up to the wire operates correctly. In
the external loopback mode (SER_MOD<ELPK>), the external logic must be programmed to loop
back frames from the transmit side to the receive side. In SYM mode, the loopback will work
properly even if the link detection signal (sd) is not asserted.
6.8
SYM Mode
In the SYM mode (SER_MOD<SYP>=1), the 100BASE-X PCS encoding and decoding is
performed by the 21440. The functions implemented in this mode include:
4-bit to 5-bit encoding in the transmit path
5-bit to 4-bit decoding in the receive path
Start-of-stream delimiter (SSD) and end-of-stream delimiter (ESD) detection and generation
Bit alignment
Carrier detect
Collision detect
Symbol error detection
Link timer
In the 100BASE-TX mode (SER_MOD<SCR>=1), the 21440 also performs the scrambling and
descrambling functions.
In the SYM mode, the MII/SYM port works as a SYM port.
Table 6-4
describes the SYM port
signal names and their appropriate functions.
Table 6-4. SYM Port Signal Description
SYM Signals
Description
tclk{i}
25 MHz transmit clock, synchronizing the txd{i} signals.
rclk{i}
25 MHz receive clock, synchronizing the rxd{i} signals.
txd{i}[4:0]
Transmit data lines, driving a symbol on each tclk{i} cycle.
rxd{i}[4:0]
Receive data lines, driving a symbol on each rclk{i} cycle.
lnk{i}
Link signal, asserted by the 21440 when the PCS logic detects a link to a remote
node. If the descrambler is enabled, the signal will not be asserted unless it is locked.
sd{i}
Signal detect, asserted by the PHY layer when it detects link connection to the
remote mode.
act{i}
Activity signal, asserted by 21440 when it transmits a frame or is receiving a frame.
rerr{i}
Not used. Must be connected to 0.
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