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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)： | 65/92頁 |
| 文件大?。?/td> | 1352K |
| 代理商： | 21440 |
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Network Interface Operation
6-8
21440 Multiport 10/100Mb/s Ethernet Controller
6.5.5
Flow Control
In the full-duplex mode, the 21440 identifies standard flow control frames during reception. If a
flow control frame is received and flow control mode is enabled (TX_PARAM<FLCE>), frame
transmission will be stopped until expiration of the pause time. If flow control frames are received
during frame transmission, the frame will be completely transmitted on the line, and then
transmission will stop. The 21440 identifies flow control frames according to the field matching
described in
Table 6-3
, and correctness of the CRC.
The value of fields 17
–
18 in the frame indicates the transmit pause time, represented in units of
slot times.
Flow control frames are not loaded into the receive FIFO. They are discarded following
identification, unless the 21440 is programmed to pass them (RX_FILT_ MOD<PFLC>).
6.6
MAC Full-Duplex Operation
In full-duplex mode (SER_MOD<FDX>), the 21440 activates the transmit and receive processes
simultaneously. It also supports receive back-to-back packets with a minimal interpacket gap
(IPG), in parallel with the transmission of back-to-back packets with an IPG of 96 bit times. In this
mode, the MAC will ignore both the carrier sense (crs{i}) and the collision detect (col{i}) signals.
6.7
MAC Loopback Operations
The 21440 supports two loopback modes:
Internal loopback
External loopback
6.7.1
Internal Loopback Mode
The internal loopback mode enables verification that the internal logic operates correctly. In this
mode, frames loaded in the transmit FIFO are transferred to the receive FIFO through the transmit
logic and receive logic. In the internal loopback mode, the 21440 disconnects from the network.
Frames are not transmitted onto the line (except in SYM mode), and frames received from the line
are rejected.
Table 6-3. Flow control Field Matching
Byte
Number
Value
Destination Address
1
–
6
01-80-C2-00-00-01
Type
13
–
14
88-08
Op-Code
15
–
16
00-01
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