USB2517I datasheet(32/58 Pages) MICROCHIP

32 / 58 page

USB2517/USB2517I

DS00001598B-page 32

 2013-2016 Microchip Technology Inc.

7.2.1.28

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 (approximately 4% boost)

‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost)

‘11’ = Elevated electrical drive strength = High (approximately 12% boost)

Note:

“Boost” could result in non-USB Compliant parameters (one

example would be Test J/K levels), the OEM should use a ‘00’

value unless specific implementation issues require additional sig-

nal boosting to correct for degraded USB signalling levels.

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 (approximately 4% boost)

‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost)

‘11’ = Elevated electrical drive strength = High (approximately 12% boost)

Note:

“Boost” could result in non-USB Compliant parameters (one

example would be Test J/K levels), the OEM should use a ‘00’

value unless specific implementation issues require additional sig-

nal boosting to correct for degraded USB signalling levels.

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 (approximately 4% boost)

‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost)

‘11’ = Elevated electrical drive strength = High (approximately 12% boost)

Note:

“Boost” could result in non-USB Compliant parameters (one

example would be Test J/K levels), the OEM should use a ‘00’

value unless specific implementation issues require additional sig-

nal boosting to correct for degraded USB signalling levels.

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 (approximately 4% boost)

‘10’ = Elevated electrical drive strength = Medium (approximately 8% boost)

‘11’ = Elevated electrical drive strength = High (approximately 12% boost)

Note:

“Boost” could result in non-USB Compliant parameters (one

example would be Test J/K levels), the OEM should use a ‘00’

value unless specific implementation issues require additional sig-

nal boosting to correct for degraded USB signalling levels.

USB2517I Datasheet(PDF) 32 Page - Microchip Technology

USB2517I Datasheet(HTML) 32 Page - Microchip Technology

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