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Ultra Fast USB 2.0 Multi-Format Flash Media Controller/USB Hub Combo
SMSC USB2640/USB2641 39 Revision 2.0 (10-03-08)
DATASHEET
7.3.3.19 E6h: Config Data Byte 3 (CFG_DAT_BYT3)
3 COMPOUND
Compound Device: Allows 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, the hub is part of a compound device
2:0 Always reads ‘0’. Always reads ‘0’.
BIT
NUMBER BIT NAME DESCRIPTION
7:4 Reserved Always reads ‘0’.
3 PRTMAP_EN Port Re-mapping enable: Selects the method used by the hub to assign port
numbers and disable ports.
‘0’ = Standard Mode. Strap options or the following registers are used to
define which ports are enabled, and the ports are mapped as Port ‘n’ on the
jub is reported as Port ‘n’ to the host, unless one of the ports is disabled,
then the higher numbered ports are remapped in order to report contiguous
port numbers to the host.
Register 300Ah: Port Disable For Self-Powered Operation (Reset = 0x00).
Register 300Bh: Port Disable For Bus-Powered Operation (Reset = 0x00).
‘1’ = Port Re-map mode. The mode enables remapping via the registers
defined below.
Register 30FBh: Port Remap 12 (Reset = 0x00)
Register 30FCh: Port Remap 3 (Reset = 0x00)
2:0 Reserved Always reads ‘0’.
BIT
NUMBER BIT NAME DESCRIPTION