I2C - ADLINK Technology arm AMPERE COM-HPC-ALT User Manual

COM-HPC-ALT User's Guide
The Module asynchronous serial ports should not be implemented as USB peripherals, as such implementations are generally not useful for low level
debug purposes.
The COM-HPC UART signals are "logic level" signals and are the logic inverse of what is on an RS-232 line. The "Mark" (logic 1) voltage level is nominally
3.3V on the COM-HPC line and the "Space" (logic 0) is nominally 0V. RS-232 transceivers (on the Carrier) invert the signals and change the levels – so
that a "Mark" is between -3V and -25V, and a "Space" is between +3V and +25V
In some situations, the UARTx_RTS# line can be used alternatively as an RS485 transmit enable line.
Name Pin #
UART0_TX C89
UART1_TX B87
UART0_RX C90
UART1_RX B88
UART0_RTS# C91
UART1_RTS# B89
UART0_CTS# C92
UART1_CTS# B90

4.3.6 I2C

Two general purpose I2C ports are defined for COM-HPC. The first of the two supports an ALERT# input. The ports shall support 100KHz operation and
should 400KHz operation. The ports should be multi-master capable. I2C0 is defined to operate from a 3.3V rail and I2C1 from a 1.8V rail. The I2C1 port
may be I3C capable.
I2C source from Ampere Altra SOC supports multi-master
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Description
Logic level asynchronous serial port transmit signal
Logic level asynchronous serial port receive signal
Logic level asynchronous serial port Request to Send
signal, active low
Logic level asynchronous serial port Clear to Send
input, active low
Copyright © 2023 ADLINK Technology, Inc.
I/O PU / PD Comment
O 3.3V
I 3.3V PU 10K
O 3.3V
I 3.3V
PICMG COM-HPC R1.0