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| 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(yè)數(shù)： | 91/108頁(yè) |
| 文件大?。?/td> | 577K |
| 代理商： | E-1110 |
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1000 Mbits/s Transmit Packet Transfer
4-3
The host asserts MTX_SOP, MTX_DVALID, and drives valid data on the
MTX_DATA[7:0] lines to start the transmit packet transfer. After the link
is up and initialized, the transmit MAC asserts MTX_ACK to respond to
the start of frame. As this point, the MAC transmit function is committed
to transmitting a packet. The MAC then starts transmitting the preamble
and SFD sequence. After the SFD is transmitted, the data transfer starts.
At this point the MAC again starts asserting the MTX_ACK signal to the
host. With every clock on which the MTX_ACK is sampled active, the
host drives new data on MTX_DATA[7:0]. The end of the frame is
indicated when MTX_EOP is asserted. At the end of a frame, the MAC
samples signals such as AUTOPAD_ENABLE to perform padding for
frames smaller than 64 bytes or MTX_APPEND_CRC to append an
FCS. If these signals are inactive, the frame is transmitted just as it is
received from the host.
After the frame is completely transmitted on the media, the MAC starts
sending the IPG. It then responds to the host for the next transfer only
at the end of the programmed IPG period. The MAC also asserts
MTX_OK, indicating that the packet has been successfully transmitted.
Assertion of the TX_STATUS_ACTIVE signal indicates that the new
RMON Status Vector is now available on MACTX_STATUS[40:0] and that
the host can sample it on rising edges of the CLK125 signal.
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