Philips UM10011 - Manual (Page 7)

Philips Semiconductors
UM10011_4
ISP1521 Hi-Speed USB Hub Demo Board
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
User manual Rev. 04.00 — 17 June 2004 7 of 20
5.2. Port Indicators
The D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13 and D14 are port indicators.
Conforming to the Universal Serial Bus Specification Rev. 2.0, each downstream facing port has two
port indicators—green and amber—placed to its right.
If the green LED is ON, it means the device connected to the port was successfully enumerated
and is functional.
If the amber LED is ON, it means there is an overcurrent condition.
Custom software applications or drivers may flash these LEDs to attract user attention.
5.3. Power LED Indicator
When power is supplied to the board, LED D16 lights up (red).
5.4. GoodLink Indicator
A Philips GoodLink TM LED D15 (red) is located near the upstream facing port. This LED blinks on
every successful USB transactions.
J1 and J2 solder
joints to disable a
port