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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)： | 56/108頁(yè) |
| 文件大小： | 577K |
| 代理商： | E-1110 |
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Transmit Function Signals
3-13
be taken to ensure that these inputs are stable during
normal operation and during packet transmissions or
receptions.
E1000_IFG_OFFSET[1:0]
E1000 Interframe Gap Offset
Input
The value on the E1000_IFG_OFFSET[1:0] lines selects
the length of the Gigabit MAC interframe gap in bits.
E1000_IFG_OFFSET[1:0] can be changed only when the
transmit engine is idle or during reset. During transmit
operation, this signal must be stable in the normal mode
of operation. For more details refer to Section 2.1.2.1,
The IPG Value congured in the Gigabit MAC is as
follows:
MTX_PAUSED
Transmit Pause Status
Output
MTX_PAUSED, when asserted, indicates that the MAC
transmit function is in the paused state. The MAC
transmit function enters the paused state only after the
MAC receive function receives a valid ow control pause
frame. When deasserted, MTX_PAUSED indicates that
the MAC transmit function is enabled to transmit any
frames requested from the host.
When the MAC is in a paused state, only ow control
packets or high-priority packets can be transmitted.
PREAMBLE_LENGTH[3:0]
Preamble Length
Input
PREAMBLE_LENGTH[3:0] is the preamble length in
bytes used by the Gigabit MAC to encapsulate the
transmit frame with preamble and SFD. The length
includes the SFD, so the minimum value is 2 (0b0010),
which corresponds to one byte of preamble plus one byte
of SFD and the maximum value is 15 (0b111), which
E1000_IFG_OFFSET[1:0]
IPG (ns)
0b00
64
0b01
80
0b10
96
0b11
112
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