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User Guide

COMe-bP5020

2.5.2.10 SPI

The Serial Peripheral Interface Bus or SPI bus is a synchronous serial data link standard developed by Motorola that operates

in full duplex mode. Devices communicate in master/slave mode where the master device initiates the data frame. Multiple

slave devices are allowed with individual slave select (chip select) lines. Sometimes SPI is called a “four wire” serial bus, con-

trasting with three, two, and one wire serial buses.

For a detailed signal description please refer to the COM Express® base specification, chapter 4.3.12.

The COMe-bP5020 supports boot from an external SPI flash. Therefore it can be configured via pin B88 (BIOS_DIS1#) for the

following configurations:

Table 10: SPI Signal Configurations

The BIOS_DIS0# signal defined in the COM Express® Base specification is not used by the COMe-bP5020.

2.5.2.11 Serial Interface

Up to four UART interfaces are available on the COMe-bP5020. The following configurations are possible:

» 2x 4-wire UARTs (factory configuration)

» 4x 2-wire UARTs

The configuration of the UART modes can be done using the U-Boot “sconf” command.

2.5.2.12 SMB / I2C

The COMe-bP5020 provides two I2C controllers with speeds up to 400 kHz for application usage. The signals on the COM

Express® connector labeled SMB_CK and SMB_DAT are connected to the I2C controller IIC2 of the P5020. The resources

occupied by the devices are as follows:

Table 11: I2C Device Resources

The signals on the COM Express® connector labeled I2C_CK and I2C_DAT are connected to the I2C controller IIC4 of the P5020.

This controller is reserved for application use only on the COMe-bP5020.

BIOS_DIS1# FUNCTION SIGNAL ROUTING

Open Boot from on-module flashes P5020 eSPI chip select SPI_CS2# is available on

the carrier

Pulled to GND Boot from external flash P5020 eSPI chip select SPI_CS0# (boot chip

select) is available on the carrier

DEVICE

I2C ADDRESS

(binary)

I2C ADDRESS

(hex)

User EEPROM 1010 110x 0xAC

RTC 1010 001x 0xA2

Thermal Sensor 1001 001x 0x92

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 70 71

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