USB4640-HZH SMSC [SMSC Corporation], USB4640-HZH Datasheet - Page 46

• Manufacturer Part Number: USB4640-HZH
• Description: High Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller
• Manufacturer: SMSC [SMSC Corporation]

Revision 1.0 (06-09-09)
8.4.4.18
8.4.4.19
BIT
BIT
7:2
1:0
7:6
5:4
3:2
1:0
EFh: Boost_Up
F0h: Boost_3:0
BOOST_IOUT_3
BOOST_IOUT_2
BOOST_IOUT
Reserved
Reserved
Reserved
NAME
NAME
Reserved
USB electrical signaling drive strength boost bit for the upstream port ‘A’.
‘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:
Reserved
Upstream 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)
Upstream 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:
Always reads ‘0’.
“Boost” could result in non-USB compliant parameters. OEM
should use a ‘00’ value unless specific implementation issues
require additional signal boosting to correct for degraded USB
signaling levels.
“Boost” could result in non-USB Compliant parameters. OEM
should use a ‘00’ value unless specific implementation issues
require additional signal boosting to correct for degraded USB
signaling levels.
DATASHEET
High Speed Inter-Chip (HSIC) USB 2.0 Hub and Flash Media Controller
46
DESCRIPTION
DESCRIPTION
SMSC USB4640/USB4640i
Datasheet