8x931HA USB Customer Hub
8
Advance Information Datasheet
3.0
Functional Description
The Intel 8x931HA USB Customer Hub supports self-powered and bus-powered configurations.
The CHUB has 1 upstream port, and 4 downstream ports.
3.1
Self/Bus-Powered Operation
The user must decide on which power mode of operation to use. Using the switch, the user can
toggle between Self-Powered Mode and Bus-Powered Mode.Section 3.6.2 explains the different
modes in more detail.
Note:
Moving the switch to Self-Powered Mode without a power source will reset the CHUB.
3.2
Status LED
The CHUB provides an operation status indicator LED. This status LED will start to blink once the
CHUB is configured as a USB Device. Once configured, the blinking of the LED indicates
execution of code from either internal or external memory.
3.3
Internal Program Memory Option
Intel’s 8x931HA USB Peripheral hub controller comes preprogrammed with an internal ROM
code which enumerates and configures the hub to a minimal default configuration. To use this
internal ROM the user must:
1.) Carefully remove plastic enclosure. (Refer to Section 4.2)
2.) Refer to Table 4 for memory options.
3.4
External EPROM Enabling or Disabling
The CHUB provides the user with the capability to enable or disable the external EPROM through
a hardware jumper or by using software. See the following table for more information.
Table 4. JW2 Jumper Settings
Jumper
Mode
Description
1-2*
External EPROM
(EA#=0)
Customer can use Intel supplied EPROM
(*default position) or their own EPROM.
2-3
Internal ROM
(EA#=1)
Customer can use their own customer mask
ROM for checkout or use Intel supplied ROM.
Table 5. JW1 Jumper Settings (Sheet 1 of 2)
Jumper
Mode
Description
1-2
ROM disabled
Hardware disabled
(CE# = 1)
