KSZ8051MNL Ver la hoja de datos (PDF) - Microchip Technology
Número de pieza
componentes Descripción
Fabricante
KSZ8051MNL Datasheet PDF : 66 Pages
| |||
KSZ8051MNL/RNL
3.3.6 TRANSMIT DATA[1:0] (TXD[1:0])
TXD[1:0] transitions synchronously with respect to REF_CLK. When TXEN is asserted, the PHY accepts TXD[1:0] for
transmission.
TXD[1:0] is 00 to indicate idle when TXEN is de-asserted. The PHY ignores values other than 00 on TXD[1:0] while
TXEN is de-asserted.
3.3.7 CARRIER SENSE/RECEIVE DATA VALID (CRS_DV)
The PHY asserts CRS_DV when the receive medium is non-idle. It is asserted asynchronously when a carrier is
detected. This happens when squelch is passed in 10 Mbps mode, and when two non-contiguous 0s in 10 bits are
detected in 100 Mbps mode. Loss of carrier results in the de-assertion of CRS_DV.
While carrier detection criteria are met, CRS_DV remains asserted continuously from the first recovered dibit of the
frame through the final recovered dibit. It is negated before the first REF_CLK that follows the final dibit. The data on
RXD[1:0] is considered valid after CRS_DV is asserted. However, because the assertion of CRS_DV is asynchronous
relative to REF_CLK, the data on RXD[1:0] is 00 until receive signals are properly decoded.
3.3.8 RECEIVE DATA[1:0] (RXD[1:0])
RXD[1:0] transitions synchronously with respect to REF_CLK. For each clock period in which CRS_DV is asserted,
RXD[1:0] transfers two bits of recovered data from the PHY.
RXD[1:0] is 00 to indicate idle when CRS_DV is de-asserted. The MAC ignores values other than 00 on RXD[1:0] while
CRS_DV is de-asserted.
3.3.9 RECEIVE ERROR (RXER)
RXER is asserted for one or more REF_CLK periods to indicate that a symbol error (for example, a coding error that a
PHY can detect that may otherwise be undetectable by the MAC sub-layer) was detected somewhere in the frame being
transferred from the PHY.
RXER transitions synchronously with respect to REF_CLK. While CRS_DV is de-asserted, RXER has no effect on the
MAC.
3.3.10 COLLISION DETECTION (COL)
The MAC regenerates the COL signal of the MII from TXEN and CRS_DV.
3.3.11 RMII SIGNAL DIAGRAM
The KSZ8051RNL RMII pin connections to the MAC for 25 MHz clock mode are shown in Figure 3-3. The connections
for 50 MHz clock mode are shown in Figure 3-4.
2016 Microchip Technology Inc.
DS00002310A-page 21
Share Link: 