USB2660 Standard Microsystems Corp., USB2660 Datasheet - Page 43

• 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
8.4.4.8
BIT
BIT
2:1
7:6
5:4
2:0
4
3
0
3
E5h: Configuration Data Byte 2 (CFG_DAT_BYT2)
CURRENT_SNS
EOP_DISABLE
COMPOUND
PORT_PWR
OC_TIMER
Reserved
Reserved
Reserved
NAME
NAME
Reserved
EOP Disable: Disables EOP generation of EOF1 when in Full-Speed mode.
During FS operation only, this permits the hub to send EOP if no
downstream traffic is detected at EOF1. See Section 11.3.1 of the USB 2.0
Specification for additional details.
‘0’ = An EOP is generated at the EOF1 point if no traffic is detected.
‘1’ = EOP generation at EOF1 is disabled (normal USB operation).
Note:
Over-Current Sense: Selects current sensing on a port-by-port basis, all
ports ganged, or none (only for bus-powered hubs). The ability to support
current sensing on a per port or ganged basis is dependent upon the
hardware implementation.
‘00’ = Ganged sensing (all ports together)
‘01’ = Individual (port-by-port)
‘1x’ = Over-current sensing not supported (must only be used with bus-
powered configurations!)
Port Power Switching: Enables power switching on all ports simultaneously
(ganged), or port power is individually switched on and off on a port-by-port
basis (individual). The ability to support power enabling on a port or ganged
basis is dependent upon the hardware implementation.
‘0’ = Ganged switching (all ports together)
‘1’ = Individual port-by-port switching
Reserved
OverCurrent Timer: Over-current timer delay.
‘00’ = 50 ns
‘01’ = 100 ns
‘10’ = 200 ns
‘11’ = 400 ns
Compound Device: Allows OEM to indicate that the hub is part of a
compound device (per the USB 2.0 Specification). The applicable port(s)
must also be defined as having a “non-removable device”.
Note:
‘0’ = No
‘1’ = Yes, the hub is part of a compound device
Reserved
Generation of an EOP at the EOF1 point may prevent a host
controller (operating in FS mode) from placing the USB bus in
suspend.
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.
DATASHEET
43
DESCRIPTION
DESCRIPTION
Revision 1.0 (06-09-09)