MIPI Alliance Releases Version 2 of SneakPeek Protocol, Opens Debug & Trace Specs to Public
October 04, 2019
MIPI SPP v2.0 introduces the TinySSP protocol for use in high-latency, low-bandwidth interfaces. The Alliance has also made nine debug and trace specifications publicly available for download.
The MIPI Alliance has released MIPI SPP v2.0, which introduces the TinySSP protocol for use in high-latency, low-bandwidth interfaces like MIPI I3C. The Alliance has also made nine debug and trace specifications publicly available for download.
MIPI SPP v2.0 replaces debug interfaces between a target and debug test systems, abstracting the interface with address-mapped read-and-write transactions that provide access to a target device’s memory agents. TinySPP reduces the data transfer and overhead of debug and test communicates by using a minimum packet length of just 4 bytes (versus 16 bytes), a byte field of 7 bits, and an addressing system that reduces 64- or 32-bit addresses to 6-bit, where possible.
SPP v2.0 also defines packetized JTAG messaging, which reduces the overhead of JTAG state changes. New opcodes also in FulSPP and TinySPP remove the need for bit-banging. There is also the ability to use a single command to set up polling loops, improving performance for high-latency interfaces.
The publication of these and other specs provides developers with a set of standardized, layered debugging interfaces and protocols. This eliminates the need for dedicated debug and test tools.
The open access specifications include MIPI’s:
- SneakPeek Protocol (MIPI SPP) v2.0 – Debug and test protocol that includes TinySPP for high-latency, low-bandwidth interfaces
- System Software-Trace (MIPI SyS-T) – Universal data format for transmitting software debug and trace information
- Narrow Interface for Debug and Test (MIPI NIDnT) – Enables the use of functional ports for debugging/testing finished products
- System Trace Protocol (MIPI STP) – Application-specific protocol for trace functions
- Trace Wrapper Protocol (MIPI TWP) – Protocol that combines multiple source trace streams into one
- High-Speed Trace Interface (MIPI HTI) – Exports trace data
- Parallel Trace Interface (MIPIPTI) – Exports trace data
- Gigabit Debug for USB (MIPI GbD USB) – Enables SPP and TWP protocols over USB sockets
- Gigabit Debug for IP Sockets (MIPI GbD IPS) – Enables SPP and TWP protocols over IP sockets
MIPI’s software specifications are also available, and provide a standard approach to loading drivers for different components.
For more information visit mipi.org.