Missing eop, Figure 4–13. overflow – Altera POS-PHY Level 4 IP Core User Manual

Page 60

4–22

Chapter 4: Functional Description—Receiver

Error Flagging and Handling

POS-PHY Level 4 IP Core User Guide

December 2014

Altera Corporation

Missing EOP

Figure 4–11

and

4–22

show that if a SOP is detected during an open packet, the

err_ry_meop

signal is asserted, an EOP is forced, the err signal is asserted, and data is

ignored for that port until an EOP is received.

Figure 4–11. Missing EOP Input Timing Diagram

Figure 4–12. Missing EOP Output Timing Diagram

Packet A

Packet B

aN_atxeop

aN_atxerr

aN_atxtclk

aN_atxena

aN_atxsop

err_ry_meop

aN_arxeop

aN_arxerr

aN_arxtclk

aN_arxena

aN_arxsop

Figure 4–13. Overflow

aN_rxclk

aN_arxena

aN_arxsop

aN_arxeop

err_ry_fifo_oflwN

aN_arxdav

Good Packet

Interrupted Packet(s)

Good Packet