UPD360 datasheet(129/221 Pages) MICROCHIP

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 2016-2017 Microchip Technology Inc.

DS00002084C-page 129

UPD360

11.4.1

PD MAC TX REGISTERS

The following sub-sections describe the various registers associated with the PD MAC TX logic.

11.4.1.1

TX Control Register A (TX_CTL_A)

Address:

1A00h

Size:

8 bits

Bits

Description

Type

Default

RESERVED

RETRY_ON_LINE_BUSY

Normally hardware will abort a TX packet (including all retry attempts) if the

line is Busy when hardware attempts to transmit the packet. (Note that trans-

mission of GoodCRC ACK in response for Soft Reset is an exception to this,

see the DIS_SPCL_SR_GCRC_ACK bit.)

Setting this bit will force hardware to not completely abort the transmission,

but rather it will retry the packet up to N_RETRY_CNT times. Failure after

N_RETRY_CNT times results in TX_FAILED status in the TX Interrupt Status

The following conditions will still abort the TX packet:

• Hard reset received

• Cable reset received (if enabled and the SOP type of the pending TX is

SOP', or SOP'', SOP'_Debug or SOP''_Debug)

• Good, non-duplicate, non-Ping, non-GoodCRC packet (including soft-

reset) received with RX and TX SOP types matching or RX SOP type

equaling SOP with TX SOP type not equaling SOP (can be disabled)

• Software sets the ABORT bit in the TX Control Register B (TX_CTL_B).

R/W

DIS_SOP_ABRTS_NON_SOP

Normally, when a SOP packet is received, a pending non-SOP packet (includ-

ing wait for a GoodCRC) will be aborted. When this bit is set, a non-SOP

packet will only be aborted by a packet with the same non-SOP type.

R/W

DIS_SPCL_SR_GCRC_ACK

Disable special treatment of GoodCRC ACK in response to Soft Reset.

By default, in auto-response mode a line busy condition will not abort Good-

CRC ACK transmission in response to Soft Reset reception. Setting this bit

will disable this behavior and instead GoodCRC ACK transmission for Soft

Reset will be processed the same as GoodCRC ACK for other packets.

Note:

When this bit is set, the WAIT4LINE_IDLE bit will affect GoodCRC

ACK for Soft Reset as well.

R/W

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