CHAPTER 3 FUNCTIONAL OUTLINE
PRELIMINARY
NEC confidential and Proprietary
68
(f) Error processing and transmission of an abort packet
This section shows the processing of
µ
PD98413 when the following errors occur in the transmit side.
•
Transmission FIFO overflow
•
Transmission FIFO underflow
•
The next start-of-packet notification is received before an end-of-packet notification
•
The TERR signal is asserted
Upon detecting any of the following errors, the
µ
PD98413 sends a POS packet as an abort packet. 7Dh and 7Eh
are inserted at the end of the packet as the abort packet.
•
Transmission FIFO underflow
•
The TERR signal is asserted
Figure 3-23. Abort Packet
Transmission FIFO overflow
If a transmission FIFO overflow occurs during packet transmission (the transmission FIFO overflows before
TEOP is asserted), the
µ
PD98413 sends all the data that remains in the transmission FIFO at that point. The
µ
PD98413 also indicates the error and interrupt when a transmission FIFO overflow occurs.
If, after a transmission FIFO overflow occurs, the remaining data for that packet is entered (the data is entered
without TSOP being asserted), the
µ
PD98413 discards that data.
Transmission FIFO underflow
If a transmission FIFO underflow occurs during packet transmission (the transmission FIFO becomes empty
before TEOP is asserted), the
µ
PD98413 inserts 7Dh and 7Eh after the data sent before the underflow occurs,
and sends the data as an abort packet. The
µ
PD98413 also indicates the error and interrupt when a
transmission FIFO underflow occurs.
If, after a transmission FIFO underflow occurs, the remaining data for that packet is entered (the data is entered
without TSOP being asserted), the
µ
PD98413 discards that data.
The next start-of-packet notification is received before an end-of-packet notification (EOP error)
If the next start-of-packet notification is received before an end-of-packet notification during packet transmission
(the TSOP of the next packet is asserted before TEOP is asserted), the
µ
PD98413 indicates the error and
interrupt.
TERR signal is asserted
If the TERR signal is asserted during packet transmission, the
µ
PD98413 inserts 7Dh and 7Eh and sends the
data as an abort packet.
Address
Control
Information
7Dh
7Eh
Summary of Contents for NEASCOT-P65
Page 4: ...PRELIMINARY NEC confidential and Proprietary 4 MEMO ...
Page 8: ...PRELIMINARY 8 MEMO ...
Page 35: ...PRELIMINARY NEC confidential and Proprietary 35 MEMO ...
Page 135: ...CHAPTER 4 INTERFACES PRELIMINARY NEC confidential and Proprietary 135 ...
Page 166: ...CHAPTER 5 REGISTERS PRELIMINARY NEC confidential and Proprietary 166 5 2 Register summary ...
Page 167: ...CHAPTER 5 REGISTERS PRELIMINARY NEC confidential and Proprietary 167 ...
Page 168: ...CHAPTER 5 REGISTERS PRELIMINARY NEC confidential and Proprietary 168 ...
Page 303: ...CHAPTER 5 REGISTERS PRELIMINARY NEC confidential and Proprietary 303 MEMO ...
Page 317: ...CHAPTER 6 JTAG BOUNDARY SCAN PRELIMINARY NEC confidential and Proprietary 318 MEMO ...