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Chapter 13
FCAN Interface Function
Preliminary User’s Manual U14913EE1V0UM00
(3)
Data consistency for CPU access
To ensure that ELISA does not overwrite or handle messages which are under use of the CPU, the
CPU has to observe the following rule for modifying any message which is also handled by ELISA:
• clear RDY flag of message
• modify message
• set RDY flag of message
If ELISA tries to access a message with RDY flag = 0, an interrupt is generated and ELISA stops its
operation. The CPU must do the error recovery then.
Cautions: 1. Any violation of this rule could cause data inconsistency-
2. Never modify by CPU any message with ERQ flag set (1) while ELISA is in opera-
tion (EER flag = 0)
(4)
Syntax check of commands
There is no syntax check implemented in ELISA that takes care:
that temporary sums and counters are not mixed
that copy commands (especially bit-string copy) parameters are within the valid range
The used programming tool has to observe that the code generated for ELISA meets the specifica-
tion of the ELISA commands. Any command not meeting the command requirements leads into
malfunction of ELISA.
The programming tools provided by NEC take care that no commands with illegal parameters are
generated.
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