USB2422 datasheet(32/47 Pages) MICROCHIP

32 / 47 page

USB2422

DS00001726B-page 32

 2013 - 2015 Microchip Technology Inc.

4.4.28

BOOST DOWNSTREAM REGISTER (BOOST40)

4.4.29

PORT SWAP REGISTER (PRTSP)

Address:

F8h

Size:

8 bits

Bits

Description

Type

Default

7:4

RESERVED

3:2

Boost Downstream Port 2 (BOOST_IOUT_2)

USB electrical signaling drive strength Boost Bit for Upstream Port '2'.

00 = Normal electrical drive strength

01 = Elevated electrical drive strength (+4% boost)

10 = Elevated electrical drive strength (+8% boost)

11 = Elevated electrical drive strength (+12% boost)

R/W

00b

1:0

Boost Downstream Port 1 (BOOST_IOUT_1)

USB electrical signaling drive strength Boost Bit for Upstream Port '1'.

00 = Normal electrical drive strength

01 = Elevated electrical drive strength (+4% boost)

10 = Elevated electrical drive strength (+8% boost)

11 = Elevated electrical drive strength (+12% boost)

R/W

00b

Address:

FAh

Size:

8 bits

Bits

Description

Type

Default

7:0

Port Swap (PRTSP)

Swaps the Upstream and Downstream USB DP and DM Pins for ease of

board routing to devices and connectors.

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

is associated with the DM pin.

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

is associated with the DP pin

Bit 7= Reserved

Bit 6= Reserved

Bit 5= Reserved

Bit 4= Reserved

Bit 3= Reserved

Bit 2= Port 2 DP/DM Swap

Bit 1= Port 1 DP/DM Swap

Bit 0= Upstream Port DP/DM Swap

R/W

00h

USB2422 数据表(PDF) 32 Page - Microchip Technology

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