1. Scope
This standard specifies the issuance of the hardware-software interface specifications of microcontrollers
and custom ICs which are used for a control unit or similar products of Hitachi Automotive Systems, Ltd.
{hereafter: (HIAMS)} and Hitachi Automotive Systems Group companies {hereafter: (HIAMS) Gr.
Companies}.
2. Purpose
Purpose is to prevent failures caused by the mismatch between the hardware and software of a control unit.
Particularly the unintentional omission or mismatch shall be prevented, when functional safety requirements
are implemented as interaction of software and hardware.
The hardware-software interface specification shall stipulate:
(1) Operating modes and configuration parameters, which are closely related to hardware devices
(equipments).
(2) Hardware use method: (including Ports Assignment Table)
(3) Time constraints that are specified for each service which is included in the technical safety concept.
(4) Hardware functions (mechanisms) that ensure the necessary independence between the elements, and support the software partitioning.
3. Definition of terms
Definition of the main term used in this standard shall be in accordance with Table 1.