參數(shù)資料
型號: E-110
廠商: LSI Corporation
英文描述: 100BASE-T Fast Ethernet Core(100BASE-T快速以太網(wǎng)處理芯片 Fast Ethernet Core)
中文描述: 100兆- T的快速以太網(wǎng)核心(100兆- T的快速以太網(wǎng)處理芯片快速以太網(wǎng)核心)
文件頁數(shù): 81/130頁
文件大?。?/td> 770K
代理商: E-110
E-110 Core Operation
3-9
Figure 3.7
Full-Duplex Non Back-to-Back IPG Operation
When instructed, the transmit function adds a preamble and SFD to the
supplied packet data and, if requested, appends a generated FCS. The
E-110 MAC transmit function adds bytes of zero before the appended
FCS to pad packets with fewer than 60 data bytes. The transmit function
detects and enforces collisions with jams and manages transmission
retries.
The transmit function block operates on the 25-MHz (100-Mbit/s
operation) or 2.5-MHz (10-Mbit/s operation) transmit nibble or symbol
clock (MTXC) supplied by the PHY. The PHY clock must be a continuous
clock. The connecting interface to the transmit control logic also operates
on the same transmit nibble clock and communicates synchronously with
the transmit function.
The transmit data is supplied to the transmit function a byte at a time
from the transmit control logic on the TPD[7:0] signals and output to the
MII a nibble at a time as defined in the MII specification. Transmit data
bytes are transferred from the host at one-half the nibble clock rate. The
transmit data is also sent to the transmit function block FCS
generator/checker. The MII output nibbles (MTXD[3:0]) are only valid
when the MTXEN signal is asserted. The transmit function supplies
nibbles of zero when MTXEN is not asserted. When MTXEN is asserted,
the transmit function supplies preamble, SFD, transmit data, FCS, jam,
or pad nibbles.
The operation of the E-110 MAC transmit function is affected by the
following control signals: no preamble (NOPRE), pad enable (PADEN),
full-duplex (FULLD), FCS enable (CRCEN), and huge packet enable
(HUGEN). The host must appropriately manage any transitions of these
signals and ensure that only valid combinations of controls signals are
used, as described below.
CRS
IPG Counter0
18 (IPGR2[6:0])
Receive
Frame
Transmit
Frame
IPG
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