CY7C65620_1105 CYPRESS [Cypress Semiconductor], CY7C65620_1105 Datasheet - Page 7

• Manufacturer Part Number: CY7C65620_1105
• Description: EZ-USB HX2LP Low Power USB 2.0 Hub Controller Family
• Manufacturer: CYPRESS [Cypress Semiconductor]

Port Indicators
The USB 2.0 port indicators are also supported directly by
CY7C65620/CY7C65630. According to the specification, each
downstream port of the hub optionally supports a status
indicator. The presence of indicators for downstream facing ports
is specified by bit 7 of the wHubCharacteristics field of the hub
class
descriptor specifies that port indicators are supported
(wHubCharacteristics, bit 7 is set). If port indicators are not
included in the hub, disable this bit through EEPROM settings.
Each port indicator pin is strategically located directly on the
opposite edge of the port with which it is associated. A port
indicator provides two colors: green and amber. This is usually
implemented as two separate LEDs, one amber and the other
green. A combination of hardware and software control is used
to inform the user of the current status of the port or the device
attached to the port and to guide the user through problem
resolution. Colors and blinking provide information to the user.
The significance of the color of the LED depends on the
operational
CY7C65620/CY7C65630 port indicators has two modes of
operation: automatic and manual.
On power up the CY7C65620/CY7C65630 defaults to automatic
mode, where the color of the Port Indicator (green, amber, off)
indicates the functional status of the CY7C65620/CY7C65630
port. In automatic mode, the CY7C65620/CY7C65630 turns on
the green LED whenever the port is enabled and the amber LED
when an overcurrent condition is detected. The color of the port
indicator is set by the port state machine. Blinking of the LEDs is
not supported in automatic mode.
of color to port state in automatic mode.
Document Number: 38-08037 Rev. *T
Note
1. Information presented in
descriptor.
mode
The
Table 1
of
default
and
CY7C65620/CY7C65630.
Table 2
Table 1
CY7C65620/CY7C65630
is from USB 2.0 specification Tables 11-6 and 11-7, respectively.
identifies the mapping
The
Table 1. Automatic Port State to Port Indicator Color
Mapping
The LED control lines can also be modulated with a square wave
for power conservation. The polarity of these pins is
programmable, see
In manual mode, the indicators are under the control of the host,
which can turn on the LEDs, or leave them off. This is done by a
USB Hub class request. Blinking of the LEDs is supported in
manual mode. The port indicators enable the user to intervene
in any error detection. For example, when babble is detected
while plugging in a defective device, or when an overcurrent
condition occurs, the port indicators corresponding to the
downstream port blink green or only light the amber LED,
respectively.
Table 2
CY7C65620/CY7C65630 is in manual mode.
Table 2. Port Indicator Color Definitions in Manual Mode
Off or Amber, if due to an
overcurrent condition
Off
Green
Off
Off
Amber
Green
Blinking Off / Green
Blinking Off / Amber
Blinking Green / Amber
Color Definition
Color Definition
displays the color definition of the indicators when
Downstream Facing Hub Port State
Configuration Options on page
CY7C65620/CY7C65630
Powered Off
Disconnected, Disabled, Not
Configured, Resetting, Testing
Enabled, Transmit, or
TransmitR
Suspended, Resuming,
SendEOR, Restart_E/S
Not operational
Error condition
Fully operational
Software attention
Hardware attention
Reserved
Port State
Port State
[1]
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