USB82640 datasheet(37/64 Pages) MICROCHIP

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 2010-2015 Microchip Technology Inc.

DS60001312A-page 37

USB82640

7.3.3.29

F0h: Boost_3:2

7.3.3.30

F1h: PortSwap

Bit

Name

Description

7:6

rsvd

5:4

BOOST_IOUT_3

Upstream USB electrical signaling drive strength boost bit for downstream

port 3.

: normal electrical drive strength = no boost

: elevated electrical drive strength = low (approximately 4% boost)

: elevated electrical drive strength = medium (approximately 8% boost)

: elevated electrical drive strength = high (approximately 12% boost)

3:2

BOOST_IOUT_2

Upstream USB electrical signaling drive strength boost bit for downstream

port 2.

: normal electrical drive strength = no boost

: elevated electrical drive strength = low (approximately 4% boost)

: elevated electrical drive strength = medium (approximately 8% boost)

: elevated electrical drive strength = high (approximately 12% boost)

Note:

“Boost” could result in non-USB Compliant parameters. OEM

should use a 00 value unless specific implementation issues

require additional signal boosting to correct for degraded USB sig-

naling levels.

1:0

rsvd

Bit

Byte Name

Description

7:0

PRT_SWP

Swaps the upstream and downstream USB DP and DM pins for ease of

board routing to devices and connectors.

: USB D+ functionality is associated with the DP pin and D- functionality is

associated with the DM pin.

: USB D+ functionality is associated with the DM pin and D- functionality is

associated with the DP pin.

Bit 7 = rsvd

Bit 6 = rsvd

Bit 5 = rsvd

Bit 4 = rsvd

Bit 3 = controls physical port 3

Bit 2 = controls physical port 2

Bit 1 = rsvd

Bit 0 = controls physical port 0

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