# DC-SCM LVDS Tunneling Protocol and Interface

## Description

The Lattice Semiconductor DC-SCM LVDS Tunneling Protocol and Interface (LTPI) IP Core is Open Computer Project (OCP) Data Center – Secure Control Module (DC-SCM) Standards compatible solution. LTPI is a protocol and interface designed for tunneling various low-speed signals between the HPM and SCM. The LTPI protocol goes over the LVDS (Low Voltage Differential Signals) electrical interfaces. This is the next generation protocol for DC-SCM 2.0 as the replacement to two Serial GPIO (SGPIO) interfaces. It allows for tunneling of not only GPIOs but also low speed serial interfaces such as I2C and UART. It is also extensible with additional proprietary OEM interfaces and provides support for raw Data tunneling between HPM CPLD and SCM CPLD.

## Devices Supported

MachXO3L, MachXO3LF, MachXO3D, Mach-NX

## References

- User Guide

## Revision History

1.2.1 | Fixed an issue in I2C repeated start operations.
1.2.0 | Added support for Mach-NX device. Fixed minor bug in interrupt reporting.
1.1.1 | Enhanced word alignment algorithm.
1.1.0 | Initial release for OCP DC-SCM 2.0 LTPI ver 1.0 compliance.
1.0.0 | Initial release.