USB2660 Standard Microsystems Corp., USB2660 Datasheet - Page 47

• Manufacturer Part Number: USB2660
• Description: Ultra Fast Usb 2.0 Hub And Multi-format Flash Media Controller With Dual Sd Interfaces
• Manufacturer: Standard Microsystems Corp.

Ultra Fast USB 2.0 Hub and Multi-Format Flash Media Controller with Dual SD Interfaces
Datasheet
SMSC USB2660/USB2660i
8.4.4.17
8.4.4.18
8.4.4.19
BIT
BIT
BIT
7:0
7:2
1:0
7:6
5:4
3:2
1:0
EEh: Power-On Time
EFh: Boost_Up
F0h: Boost_3:0
BOOST_IOUT_3
BOOST_IOUT_2
PWR_ON_TIME
BOOST_IOUT
BYTE NAME
Reserved
Reserved
Reserved
NAME
NAME
Always reads ‘0’.
The length of time that it takes (in 2 ms intervals) from the time the host
initiated power-on sequence begins on a port until power is adequate on that
port. If the host requests the power-on time, the system software uses this
value to determine how long to wait before accessing a powered-on port.
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:
“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
47
DESCRIPTION
DESCRIPTION
DESCRIPTION
Revision 1.0 (06-09-09)