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Joachim Strömbergson 1d2a71ec0c Change file extension to markdown Signed-off-by: Joachim Strömbergson <joachim@assured.se>		2023-07-04 09:04:24 +02:00
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rtl	Remove name, version from several cores	2022-10-11 09:50:45 +02:00
tb	Updated README, completed testcase and cleaned up the testbench	2023-07-04 09:04:24 +02:00
toolruns	Make initial public release	2022-09-19 08:51:11 +02:00
README.md	Change file extension to markdown	2023-07-04 09:04:24 +02:00

README.md

uds

Unique Device Secret core

Introduction

This core store and protect the Unique Device Secret (UDS) asset. The UDS can be accessed as eight separate 32-bit words. The words can be accessed in any order, but a given word can only be accessed once between reset cycles. The words can only be accessed as long as the fw_app_mode input is low, implying that the CPU is executing the FW.

Each UDS words has a companion read bit that is set when the word is accessed. This means that the even if the chip select (cs) control input is forced high, the content will become all zero when the read bit has been set after one cycle.

Implementation

The UDS words are implemented in discrete registers.