Utopia Multi-Phy Operations - Freescale Semiconductor MPC850 User Manual

UTOPIA Multi-PHY Operations

UTPClk
TxClav
TxEnb
UTPB
SOC
The transmit end-of-cell sequence is shown in Figure 43-5. In this example the PHY is
ready for the next cell transfer and has asserted TxCav immediately at the end of the cell
transfer. The TxCav signal should be kept asserted until the TxEnb signal is asserted by the
MPC850SR to indicate the transfer start of a new cell.
UTPClk
TxClav
TxEnb
UTPB
SOC
43.3 UTOPIA Multi-PHY Operations
The MPC850SR supports a multi-PHY interface through the use of PHY addressing
signals. The following are guidelines for Multi-PHY operation:
• Up to 4 PHYS may be supported.
• Supports using additional PHY addressing signals - PHREQ and PHSEL.
H1
Figure 43-4. UTOPIA Transmitter Start of Cell
P45 P46 P47
Figure 43-5. UTOPIA Transmitter End of Cell
MPC850 Family User's Manual
H2 H3 H4
P48
UDF