Datasheet

USB 2.0 Hi-Speed 7-Port Hub Controller
Datasheet
Revision 2.8 (09-17-12) 24 SMSC USB2517
DATASHEET
7.2.1.9 Register 08h: Configuration Data Byte 3
5:4 OC_TIMER Over-Current Timer: Over-Current Timer delay.
00 = 0.1ms
01 = 4ms
10 = 8ms
11 = 16ms
3 COMPOUND Compound Device: Allows the OEM to indicate that the Hub is part of a
compound (see the USB Specification for definition) device. The applicable
port(s) must also be defined as having a "Non-Removable Device".
Note: When configured via strapping options, declaring a port as non-
removable automatically causes the hub controller to report that it
is part of a compound device.
0 = No
1 = Yes, Hub is part of a compound device
2:0 Reserved Reserved
BIT
NUMBER BIT NAME DESCRIPTION
7:4 Reserved Reserved
3 PRTMAP_EN Port Re-mapping enable: Selects the method used by the hub to assign port
numbers and disable ports.
‘0’ = Standard Mode
‘1’ = Port Re-map mode
2:1 LED_MODE LED Mode Selection: The LED_A[7:1]_N and LED_B[7:1]_N pins support
several different modes of operation.
‘00’ = USB Mode
‘01’ = Speed Indication Mode
‘10’ = Same as ‘00’, USB Mode
‘11’ = Same as ‘00’, USB Mode
Warning: Do not enable an LED mode that requires LED pins that are not
available in the specific package being used in the implementation!
Note: The Hub will only report that it supports LED's to the host when
USB mode is selected. All other modes will be reported as No LED
Support.
0 STRING_EN Enables String Descriptor Support
‘0’ = String Support Disabled
‘1’ = String Support Enabled
BIT
NUMBER BIT NAME DESCRIPTION