AUTOSAR COM · Sheet
Plain words and AUTOSAR words
The course uses everyday words. This is the list that takes you from each one to the official term, and to what it means.
| Plain word | AUTOSAR word | In one sentence |
|---|---|---|
| Control unit | ECU | One of the small computers in a car. |
| Application | Software component (SWC) | The software that does the actual function and uses the signals. |
| Switchboard | RTE | The layer between applications and COM. |
| Signal | Signal | One value with a meaning, such as the speed. |
| Packet | I-PDU | A handful of bytes holding several signals side by side. |
| Frame | L-PDU | What the bus carries in one go. |
| Heartbeat | Main function | COM's regular job, called at a fixed rhythm. |
| Triggered / pending | Transfer property | Whether writing a signal makes its packet go out. |
| Send setting | Transmission mode | DIRECT, PERIODIC, MIXED or NONE. |
| Repeats | Number of repetitions | Extra sends after the first one. |
| Minimum gap | Minimum delay time (MDT) | Shortest allowed time between two sends of one packet. |
| Condition | Transmission mode condition (TMC) | A rule on one signal's value used to pick the send setting. |
| True / false result | Transmission mode selector (TMS) | The combined result of all conditions in a packet. |
| Immediate / deferred | Signal processing | Whether the application is told at once or at the next heartbeat. |
| Start value | Init value | The value a signal has before a real one exists. |
| Update-bit | Update-bit | One bit that marks a signal as new. |
| Watching the clock | Deadline monitoring | Noticing that a packet did not arrive, or was not sent, in time. |
| Reserved value | Data invalid value | The value that means "I have no good value". |
| Filter | Reception filter | A pass-or-block rule for received values. |
| Message to the application | Notification (callback) | COM calling the application when something happened. |
| Signal group, member | Signal group, group signal | Values that must travel as a matching set. |
| Staging area | Shadow buffer | Where a group's values are collected before hand-over. |
| Packet group | I-PDU group | A set of packets started and stopped together. |
| Copy rule | Gateway mapping | A fixed rule to pass a received signal on into another packet. |
| Big packet | Large I-PDU | A packet that does not fit in one frame. |
| Helper that sends in pieces | Transport protocol (TP) | Splits big packets into frames and joins them again. |
| Signal with changing size | Dynamic length signal | A row of bytes whose length varies. |
| Fast lane | Large Data Path | COM passes finished bytes through untouched. |
| Sorting office | PDU Router (PduR) | The layer below COM that routes whole packets. |
| Setting, box of settings | Configuration parameter, container | How COM is told in advance what to do. |
| Byte order | Endianness | Which byte of a longer number comes first. |
| Copy the sign | Sign extension | Keeping a negative number negative when it gets more bits. |