USB2513 datasheet(38/63 Pages) MICROCHIP

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USB 2.0 Hi-Speed Hub Controller

Datasheet

Revision 2.2 (02-17-12)

SMSC USB251xB/xBi

DATASHEET

5.1.28

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 signalling levels.

5.1.29

BIT

NUMBER

BIT NAME

DESCRIPTION

7:6

BOOST_IOUT_4

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)

5:4

BOOST_IOUT_3

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)

3:2

BOOST_IOUT_2

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)

1:0

BOOST_IOUT_1

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)

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

PRTSP

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.

USB2513 数据表(PDF) 38 Page - Microchip Technology

USB2513 数据表(HTML) 38 Page - Microchip Technology

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USB2513 数据表(PDF) 38 Page - Microchip Technology

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