KSZ8721SL-TR Datasheet, PDF (27/33 Pages) Micrel Semiconductor – 3.3V Single Power Supply 10/100BASE-TX/FX MII Physical Layer Transceiver

KS8721BL/SL
RX+/RX-
Start of
Stream
CRS
t_CRS1
End of
Stream
t_CRS2
RXDV
t_RLAT
RXD[3:0]
RXER
RXC
t_HD
t_SU
t_WH
t_WL
t_P
Figure 6. 100BASE-T MII Receive Timing
Micrel
Symbol
t_P
t_WL
t_WH
t_SU
t_HD
t_RLAT
t_CRS1
t_CRS2
Parameter
RXC Period
RXC Pulse Width
RXC Pulse Width
RXD [3:0], RXER, RXDV Set-Up to Rising Edge of RXC
RXD [3:0], RXER, RXDV Hold from Rising Edge of RXC
CRS to RXD Latency, 4B or 5B Aligned
“Start of Stream” to CSR Asserted
“End of Stream” to CSR De-Asserted
Min Typ Max Units
40
ns
20
ns
20
ns
20
ns
20
ns
1
2
3
BT
140
ns
170
ns
Table 5. 100BASE-T MII Receive Timing Parameters
May 2004
27
M9999-051704