Gpios; Lpc Bus; I²C Bus; Spi - Congatec COM Express conga-TCA5 User Manual

Com express type 6 compact module based on the intel atom, pentium and celeron apollo lake soc

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Table of Contents

5.1.11

GPIOs

The conga-TCA5 offers General Purpose Input/Output signals on the AB connector.

5.1.12

The conga-TCA5 offers the LPC (Low Pin Count) bus on the A-B connector. For information about the decoded LPC addresses, see section

9.1.1.

Note

All conga-TCA5 CPUs run the LPC bus at 25 MHz.

5.1.13

I²C Bus

The I²C bus is implemented through the congatec board controller (Texas Instruments Tiva™ TM4E1231H6ZRB) and accessed through the

congatec CGOS driver and API. The controller provides a fast-mode multi-master I²C bus that has the maximum I²C bandwidth.

5.1.14

The conga-TCA5 supports SPI interface. This interface makes it possible to boot from an external SPI flash (alternative interface for the BIOS

flash device).

5.1.15

PWR_OK

Power OK from main power supply or carrier board voltage regulator circuitry. A high value indicates that the power is good and the module

can start its onboard power sequencing.

Carrier board hardware must drive this signal low until all power rails and clocks are stable. Releasing PWR_OK too early or not driving it low

at all can cause numerous boot up problems. It is a good design practice to delay the PWR_OK signal a little (typically 100ms) after all carrier

board power rails are up, to ensure a stable system. See screenshot below.

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