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R
R
FIGURE 3
3.4 TXERR and RXERR Coding美育课程
To reduce power of this interface, TXERR and RXERR, will be encoded in a manner that minimizes transitions during normal network operation. This is done by the following encoding method. Note that the value of GMII_TX_ER and GMII_TX_EN are valid at the rising edge of the clock while TXER
R is prented on the falling edge of the clock. RXERR coding behaves in the same way.
TXERR <= GMII_TX_ER (XOR) GMII_TX_EN
RXERR <= GMII_RX_ER (XOR) GMII_RX_DV运动健康
When receiving a valid frame with no errors, RXDV=true is generated as a logic high on the á edge of RXC and RXERR=fal is generated as a logic high the â edge of RXC. When no frame is being received, RXDV=fal is generated as a logic low on the áedge of RXC and RXERR=fal is generated as a logic low on the â edge of RXC.
When receiving a valid frame with errors, RXDV=true is generated as logic high on the á edge of RXC and RXERR=true is generated as a logic low on the â edge of RXC.
TXERR is treated in a similar manner. During normal frame transmission, the signal stays at a logic high for both edges of TXC and during the period between frames where no errors are to be indicated, the signal stays low for both edges.
李姓女孩名字大全TX_CTL GMII_TX_EN GMII_TX_ER TXD[7:0]Description quest parameter 0,00000 through FF Normal inter-frame TRANSMIT_COMPLETE
血蛤的功效与作用
0,10100 through 0E Rerved —
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四月清和雨乍晴0,1010F Carrier Extend EXTEND (eight bits)
0,10110 through 1E Rerved —
0,1011F Carrier Extend Error EXTEND_ERROR (eight bits)
0,10120 through FE Rerved —
1,11000 through FF Normal data transmission ZERO, ONE (eight bits)
1,01100 through FF Transmit error propagation No applicable parameter
NOTE—Values in TXD[7:0] column are in hexadecimal
TABLE 3 (Allowable Encoding of TXD, TXERR and TXEN)
