[SystemSafety] Development of code for ASICs under IEC 61508

[SPRIGGS, John J]

In a previous job, I was advised by a Regulator that if I were to design a device using hardware techniques, e.g. describing it using NAND gates on a circuit diagram, then I should assure it as a piece of hardware, but if I were to design it using software techniques, e.g. describing it in VHDL, then I should assure it as if it were a piece of software.


John

From: systemsafety-bounces at techfak.uni-bielefeld.de [mailto:systemsafety-bounces at techfak.uni-bielefeld.de] On Behalf Of Martin Lloyd
Sent: 02 July 2013 17:32
To: systemsafety at techfak.uni-bielefeld.de
Subject: [SystemSafety] Development of code for ASICs under IEC 61508

Dear Colleagues

I have a question about code developed for ASICs under IEC 61508:2010. IEC 61508-2 specifies that an ASIC development life cycle shall be used and notes the similarity between the software and ASIC life cycles (7.1.3.1 Note 2). However, there is a concern that the standard's requirements for the ASIC life cycle appear to be less than those for software. For example, IEC 61508-3 specifies requirements for tools, including programming languages in para 7.4.4. On the other hand, IEC 61508-2 is less forthcoming on the issue of tools. It cross refers to para 7.4.4.2 of IEC 61508-3 in 7.8 the section on modification (7.8.2.3), and also mentions in Table B6 (normative) Use of tools that are proven in use (see 7.4.10) or validated; general computer aided development for all phases of the safety lifecycle.

Thus, should one interpret the standard along the lines that  when one needs to certify an ASIC against IEC 61508-2, then it must also be the case that the ASIC code complies with IEC 61508-3 as well?




--

Kind regards



Martin Lloyd





===========================

Dr M H Lloyd CEng FIET

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Tel: +44(0)118 941 2728

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