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USB2517 데이터시트(PDF) 31 Page - Microchip Technology

부품명 USB2517
상세설명  USB 2.0 Hi-Speed 7-Port Hub Controller
PDF  58 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB2517 데이터시트(HTML) 31 Page - Microchip Technology

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 2013-2016 Microchip Technology Inc.
DS00001598B-page 31
USB2517/USB2517I
7.2.1.26
Register F6h: Boost_Up
7.2.1.27
Register F7h: Boost_7:5 (Reset = 0x00)
Bit
Number
Bit Name
Description
7:2
Reserved
Reserved
1:0
BOOST_IOUT
USB electrical signaling drive strength Boost Bit for Upstream Port.
‘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.
Bit
Number
Bit Name
Description
7:6
Reserved
Reserved
5:4
BOOST_IOUT_7
USB electrical signaling drive strength Boost Bit for Downstream Port ‘7’.
‘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)
3:2
BOOST_IOUT_6
USB electrical signaling drive strength Boost Bit for Downstream Port ‘6’.
‘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)
1:0
BOOST_IOUT_5
USB electrical signaling drive strength Boost Bit for Downstream Port ‘5’.
‘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)



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