UPD360 datasheet(157/221 Pages) MICROCHIP

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 2016-2017 Microchip Technology Inc.

DS00002084C-page 157

UPD360

11.4.3.4

RX Error Interrupt Status Register (RX_ERR_IRQ_STAT)

This register reflects the status of various RX_ERR_IRQ_STAT sources. Whether an interrupt is generated or not

depends on the values in the RX Error Interrupt Enable Register (RX_ERR_IRQ_EN).

Bits in this register are set by hardware and must be cleared by software.

Address:

1A83h

Size:

8 bits

Bits

Description

Type

Default

DBG_EVENT

Debug event occurred:

• Count of packets with bad CRC reached limit. Provides indication of link

quality.

• Count of duplicate packets reached limit. Provides indication dropped

GoodCRC packets by receiver.

Note:

Software must read both count registers in order to determine

which of the above two conditions caused the event.

Note:

Unlike other RX IRQ status bits, which are triggered by strobes,

this bit is persistent, i.e., if the register causing the interrupt is not

cleared prior to clearing the interrupt then this bit will set again.

R/W1C

6:4

RESERVED

RX_BAD_PKT

Received corrupt packet (Bad CRC, Symbol Error, Oversize or ODD nibble

count). RX_PKT_STAT[0] (BAD_CRC), RX_PKT_STAT[5] (SYM_ERROR),

RX_PKT_STAT[6] (ODD_NIBBLES) or RX_PKT_STAT[3] (RX_OVER_SIZE)

in the RX Packet Status Register (RX_PKT_STAT) will be set.

R/W1C

RX_BUF_OVR_RUN

Receiving packet but no buffer space available. In this case, the RX_PK-

T_STAT[4] (RX_FIFO_FULL) bit in the RX Packet Status Register (RX_PK-

T_STAT) will be set.

Received packet will be dropped.

R/W1C

RX_PCOL_ERROR

Applicable to Auto Retry Mode only. Hardware detected protocol error. i.e.,

received other than GoodCRC or Ping message when a GoodCRC message

was expected.

Received message will be placed in RXQ and RX_DONE be will be set.

Auto Retry will be aborted and TX_ABORTED bit will be set.

R/W1C

RX_PKT_DROPPED

RX packet is dropped due to:

• Duplicate packet in Auto Response Mode

• GoodCRC message in Auto Retry Mode

R/W1C

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