Microchip MH1RT Bedienungsanleitung


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®
NOTE
DATE
March 2009
TO: Aerospace customers
SUBJECT:
MH1RT ARAM Compiler
On a recent MH1 composite array, it has been observed wrong data coming from embedded RAM.
After analysis, ATMEL found a potential risk when the RAM coming from the ARAM/MH1RT Compiler is
accessed in an asynchronous way.
This phenomenon is observed in very specific conditions:
- when addresses change in the setup / hold window during a READ access, i.e when a
timing violation occurs between addresses and the memory enable,
- and after changes of specific addresses according to the size and format of the memory
In case of composite array, currently, ATMEL issues to the customer, 2 RTL models, one Verilog
and one VHDL.
In such case of timing violation, today the Verilog model invalidates (set to X) the entire memory
plan while the VHDL model invalidates only the Data output during this violation.
As, even if ATMEL delivered full tested parts, due to the synchronous way mandatory on the tester
side, this phenomenon could be hidden and could affect the delivered parts, one asks to the customers
using the embedded RAM on their application board in an asynchronous way, to contact ATMEL.
Corrective action
It was decided, whatever is the size and the type of the hard block (SRAM/TPRAM/DPRAM) to
invalidate in the RTL models (VHDL and Verilog) the entire memory plan when such event occurs
(memory access during the set-up/hold window) to be more realistic and safe.
These models already exist for Verilog, for VHDL are available on specific request and will be
available in the next Design Kit release.


Produktspezifikationen

Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: MH1RT

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