Philips UM10011 Port Indicators, Power LED Indicator, GoodLink Indicator, Philips Semiconductors

Philips Semiconductors	UM10011_4
	ISP1521 Hi-Speed USB Hub Demo Board

J1 and J2 solder

joints to disable a

port

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 GoodLinkTM LED D15 (red) is located near the upstream facing port. This LED blinks on every successful USB transactions.

		© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
User manual	Rev. 04.00 — 17 June 2004	7 of 20