USB2512BI/M2 View Datasheet(PDF) - Microchip Technology

Part Name

Description

MFG CO.

USB2512BI/M2

USB 2.0 Hi-Speed Hub Controller

Microchip Technology 

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USB251xB/xBi

5.1.28 REGISTER F8H: BOOST_4:0

Bit Number

7:6

5:4

3:2

1:0

Bit Name

BOOST_IOUT_4

BOOST_IOUT_3

BOOST_IOUT_2

BOOST_IOUT_1

Description

USB electrical signaling drive strength boost bit for downstream port 4.

00 : normal electrical drive strength - no boost

01 : elevated electrical drive strength - low (~4% boost)

10 : elevated electrical drive strength - medium (~ 8% boost)

11 : elevated electrical drive strength - high (~12% boost)

USB electrical signaling drive strength boost bit for downstream port 3.

00 : normal electrical drive strength - no boost

01 : elevated electrical drive strength - low (~4% boost)

10 : elevated electrical drive strength - medium (~ 8% boost)

11 : elevated electrical drive strength - high (~12% boost)

USB electrical signaling drive strength boost bit for downstream port 2.

00 : normal electrical drive strength - no boost

01 : elevated electrical drive strength - low (~4% boost)

10 : elevated electrical drive strength - medium (~ 8% boost)

11 : elevated electrical drive strength - high (~12% boost)

USB electrical signaling drive strength boost bit for downstream port 1.

00 : normal electrical drive strength - no boost

01 : elevated electrical drive strength - low (~4% boost)

10 : elevated electrical drive strength - medium (~ 8% boost)

11 : elevated electrical drive strength - high (~12% boost)

Note:

Boost could result in non-USB compliant parameters. Therefore, a value of 00 should be implemented

unless specific implementation issues require additional signal boosting to correct for degraded USB sig-

naling levels.

5.1.29 REGISTER FAH: PORT SWAP

Bit Number

7:0

Bit Name

PRTSP

Description

Port Swap: swaps the upstream USBDP/USBDM pins (USBDP_UP and

USBDM_UP) and the downstream USBDP/USBDM pins (USBDP_DN[x:1] and

USBDP_DN[x:1]) 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 : rsvd

Bit 6 : rsvd

Bit 5 : rsvd

Bit 4 : controls port 4

Bit 3 : controls port 3

Bit 2 : controls port 2

Bit 1 : controls port 1

Bit 0 : when set to 1, the upstream port DP/DM is swapped.

 2010 - 2015 Microchip Technology Inc.

DS00001692C-page 29

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