Cypress EZ-USB HX2LP, CY7C656xx manual Port Indicator Color Definitions in Manual Mode Port State

PRELIMINARYCY7C656xx

The LED control lines can also be modulated with a square wave for power conservation in systems using batteries. Alone with this there is also a polarity control for these pins, see section 9.3.

In manual mode, the indicators are under the control of the host, which can turn on one of the LEDs, or leave them off. This is done by a system software USB Hub class request. Blinking of the LEDs is supported in Manual Mode. The port indicators allow the user to intervene on any error detection. For example, when babble is detected on plugging in a defective device, or on occurrence of an overcurrent condition, the port indicators corresponding to the downstream port will blink green or only light the amber LED, respectively.

Note:

Table 5-2displays the color definition of the indicators when CY7C656xx is in Manual Mode.[1]

Table 5-2. Port Indicator Color Definitions in Manual Mode

Color Definition	Port State
Off	Not operational
Amber	Error condition
Green	Fully Operational
Blinking Off/Green	Software Attention
Blinking Off/Amber	Hardware Attention
Blinking Green/Amber	Reserved

1.Information presented in Table 5-1and Table 5-2is from USB 2.0 specification Tables 11-6 and 11-7, respectively.

Document #: 38-08037 Rev. *D Page 6 of 23