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參數(shù)資料
| 型號(hào)： | E-1110 |
| 英文描述： | E-1110 10/100/1000 Mbits/s Ethernet MAC preliminary technical manual 4/01 |
| 中文描述： | 電子1110 10/100/1000 Mbits /秒以太網(wǎng)MAC初步的技術(shù)手冊(cè)4 / 01 |
| 文件頁數(shù)： | 19/108頁 |
| 文件大?。?/td> | 577K |
| 代理商： | E-1110 |
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2-8
Functional Description
and SFD insertion is required or not can be optionally controlled from the
host with the MTX_NOPRE signal.
IEEE 802.3 Carrier Extension – Not supported because the Gigabit
MAC operates in the full-duplex mode.
IEEE 802.3 Frame Bursting – Not supported because the Gigabit MAC
operates in the full-duplex mode.
Transmit Statistics Generation – The Gigabit MAC transmit statistics
generation function complies with the IEEE 802.3 standard. The Transmit
Status Vector[40:0] (MACTX_STATUS[40:0]) output bus contains transmit
statistics information presented on a frame-by-frame basis. The E-1110
MAC transmit function updates the MACTX_STATUS[40:0] output bus on
the rising edge of the TX_STATUS_ACTIVE output signal. The E-1110
MAC issues a transmit statistics vector update at the end of the nal or
only attempt to transmit each frame. The MACTX_STATUS[40:0] signals
remain stable until the subsequent rising edge of the
TX_STATUS_ACTIVE output. The condition associated with each signal
is valid when the signal is asserted HIGH.
The MAC transmit function provides transmit statistics that can be used
for the RMON and simple network management (SNMP) protocols.
However, the MAC does not collect the statistics specically mentioned
in the RMON and SNMP standards specications. The MAC only
provides the basic per frame information that can be collected with an
application built on top of the E-1110 core. The collected information can
then be used for RMON and SNMP statistics.
2.1.2.2 Gigabit MAC Transmit Sequence
A packet transmission from the host begins when the host asserts the
MTX_SOP and MTX_DVALID signals and drives valid the
MTX_DATA[7:0] signal lines to the E-1110 core. When this occurs, the
E-1110 recognizes a valid packet transfer and in turn sends the data to
the Gigabit MAC or E-110 MAC, depending on the speed of operation.
Gigabit Mode – In the Gigabit mode, the data along with the start of
frame information is sent to the Gigabit MAC. The Gigabit MAC then
begins sending the preamble and SFD on the GMII bus after adding the
required programmed IPG. If the core is congured for TBI mode, the
GMII signals are routed to the PCS module. The PCS then encodes the
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