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參數(shù)資料
| 型號(hào)： | E-110 |
| 廠(chǎng)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(yè)數(shù)： | 82/130頁(yè) |
| 文件大?。?/td> | 770K |
| 代理商： | E-110 |
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3-10
Core Descriptions
NOPRE. If no preamble is selected (the NOPRE signal is asserted),
the preamble and start of frame nibbles come directly from the host
and are not examined by the E-110 MAC transmit function. If NOPRE
is not asserted, the MAC encodes the preamble including the SFD
and outputs it at the beginning of the packet.
PADEN. When asserted, the PADEN signal instructs the transmit
function to pad packets of fewer than 60 bytes with bytes of zero. The
CRCEN signal must also be asserted because the MAC must
calculate the FCS when it inserts its own pad bytes. If PADEN is not
asserted, the host must ensure that packets contain at least 60
bytes; otherwise, the packet is invalid (too short).
FULLD. When asserted, the FULLD signal instructs the transmit
function to operate in full-duplex mode by not deferring to the CRS
signal and not responding to the COL signal.
CRCEN. If the CRCEN signal is deasserted, the last four data bytes
of a packet must be a valid FCS provided by the host and are
checked by the MAC’s transmit function. If the FCS is not valid, the
MAC asserts the FCS error signal (TSV21) in the Transmit Statistics
Vector. If CRCEN is asserted, the transmit function generates an
FCS from the transmit data bytes and pad bytes of the packet and
outputs it at the end of the packet. You can change CRCEN on a
packet-by-packet basis, but you must not change it during an active
transmission.
HUGEN. When asserted, the HUGEN signal instructs the MAC
transmit function to allow transmission of packets up to 32 Kbytes
rather than the normal limit of 1518. However, the MAC core does
not enforce the length of the maximum packet. Instead, the higher
layer protocols must assure that the packet size does not exceed
IEEE specifications.
For more information about these signals, refer to Chapter 2.
A packet transmission from the host to the transmit function begins when
the host asserts the TPSF signal. When the TPSF signal is asserted, the
host may also present the first data byte of the packet on TPD[7:0]. The
host may also delay supplying the first data byte on TPD[7:0] until the
transmit function has sent out the preamble.
Assuming the NOPRE signal is not asserted, the transmit function (after
any pending backoff and needed deference) begins to generate
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