UPD360 datasheet(145/221 Pages) MICROCHIP

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 2016-2017 Microchip Technology Inc.

DS00002084C-page 145

UPD360

11.4.2.6

RX Packet Status Register (RX_PKT_STAT)

This register is applicable only when using auto-response/retry modes. This register is used in conjunction with the fol-

lowing bits to provide additional information regarding the status of a received packet:

• RX_DONE bit in the RX Interrupt Status Register (RX_IRQ_STAT)

• RX_PCOL_ERROR bit in the RX Error Interrupt Status Register (RX_ERR_IRQ_STAT)

• RX_PKT_DROPPED bit in the RX Error Interrupt Status Register (RX_ERR_IRQ_STAT)

• RX_BUF_OVR_RUN bit in the RX Error Interrupt Status Register (RX_ERR_IRQ_STAT)

Bits in this register are sticky, i.e., once any bit is set by hardware this field cannot be updated by hardware until software

clears the field.

A value of 0x00 indicates no errors, while a value of 0xFF indicates that the packet status is currently unknown. Other

values are interpreted as specified in the bit definitions for this register.

Address:

1A45h

Size:

8 bits

Note:

There no status for having received a GoodCRC message with matching MSG_ID. Successful completion

of a TX is indication that a valid GoodCRC ACK was received.

Note:

Bits in this register are set by hardware and must be cleared by software. The bits are not mutually exclu-

sive, i.e., more than one bit may be set depending on the circumstance.

Bits

Description

Type

Default

RESERVED

RX_PKT_STAT[6]

ODD_NIBBLES. Received packet dropped because it had odd number of nib-

bles in data phase. Not set if RX_PKT_STAT[3] (RX_OVER_SIZE) is set

regardless of bad CRC, symbol errors or odd nibbles. RX_BAD_PKT interrupt

is asserted.

R/W1C

RX_PKT_STAT[5]

SYM_ERROR. There was a symbol error in packet but BAD_CRC was not

reported. Not set if RX_PKT_STAT[3] (RX_OVER_SIZE) is set regardless of

bad CRC, symbol errors or odd nibbles. RX_BAD_PKT interrupt is asserted.

R/W1C

RX_PKT_STAT[4]

RX_FIFO_FULL. Received packet had to be dropped because the FIFO was

full either at SOP or during data. RX_BUF_OVR_RUN interrupt is asserted.

R/W1C

RX_PKT_STAT[3]

RX_OVER_SIZE. Received packet had to be dropped because it was larger

than the maximum size set in the RX Maximum Packet Size Register.

RX_BAD_PKT interrupt is asserted.

R/W1C

RX_PKT_STAT[2]

PCOL_ERROR. Received other than GoodCRC or Ping message when

GoodCRC was expected. RX_PCOL_ERROR interrupt is asserted.

R/W1C

RX_PKT_STAT[1]

DUPLICATE_PACKET. Applicable to auto-response mode. RX_PKT_-

DROPPED interrupt is asserted.

R/W1C

RX_PKT_STAT[0]

BAD_CRC. RX packet had bad CRC. RX_BAD_PKT interrupt is asserted.

This bit is also forced set if symbol error or odd nibble count occurs. It is not

set if RX_PKT_STAT[3] (RX_OVER_SIZE) is set, regardless of bad CRC,

symbol errors or odd nibbles.

R/W1C

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