Functional Description
RTM-ATCA-F140 Installation and Use (6806800M97A)
37
4.2.3
LEDs
The RTM-ATCA-F140 provides four panel-visible LEDs that provide the standard ATCA
management LED functions:
Red - Out of Service
Green - In Service
Blue - Hot swap (initializing / shutting down)
Amber - Attention
The LEDs are controlled by a PCF8574-type I2C parallel I/O expander. The ports of this are
connected as shown below.
The I/O expander interrupt line is not connected.
For the red, green and amber LEDs the cathodes are connected directly to the I/O expander
pins and the anodes are connected to the management 3.3V supply through current limiting
resistors selected to limit the LED current to 15mA. Since the I/Os power-up in the high state,
this ensures that the LEDs will remain off until explicitly turned on by the IPMC.
For the blue LED an external FET inverter is used to ensure the LED is on at power-up and a
charge pump is used to provide adequate forward voltage in the case the LED cannot be
operated directly from 3.3V.
Table 4-2 PCF 8574 Port Usage
Port
Direction
Connection
0
Output
H/S LED (Blue)
1
Output
OOS LED (Red)
2
Output
IS LED (Green)
3
Output
ATTN LED (Amber)
4
Output
OOS LED (Amber)
5
Output
FPGA PROM select
6
N/A
(not connected)
7
Input
FPGA DONE
EA Version
Содержание RTM-ATCA-F140
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Страница 8: ...RTM ATCA F140 Installation and Use 6806800M97A 8 List of Tables EA Version ...
Страница 10: ...RTM ATCA F140 Installation and Use 6806800M97A 10 List of Figures EA Version ...
Страница 14: ...RTM ATCA F140 Installation and Use 6806800M97A About this Manual 14 About this Manual EA Version ...
Страница 20: ...Introduction RTM ATCA F140 Installation and Use 6806800M97A 20 EA Version ...
Страница 30: ...Hardware Preparation and Installation RTM ATCA F140 Installation and Use 6806800M97A 30 EA Version ...
Страница 34: ...Controls LEDs and Connectors RTM ATCA F140 Installation and Use 6806800M97A 34 EA Version ...
Страница 58: ...Functional Description RTM ATCA F140 Installation and Use 6806800M97A 58 EA Version ...
Страница 60: ...Related Documentation RTM ATCA F140 Installation and Use 6806800M97A 60 EA Version ...
Страница 70: ...Index RTM ATCA F140 Installation and Use 6806800M97A 70 EA Version ...
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