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Update AVCLAN summary

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Allen Hill 2023-09-13 17:09:11 -04:00
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src/avclandrv.c
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@ -24,7 +24,8 @@
AVC LAN Theory AVC LAN Theory
The AVC LAN bus is an implementation of the IEBus (mode 1) which is a The AVC LAN bus is an implementation of the IEBus (mode 1) which is a
differential signal. differential signal; IEBus is electrically (but not logically) compatible with
CAN bus.
- Logical `1`: Potential difference between bus lines (BUS+ pin and BUS– pin) - Logical `1`: Potential difference between bus lines (BUS+ pin and BUS– pin)
is 20 mV or lower (floating). is 20 mV or lower (floating).
@ -40,12 +41,15 @@
Driving (logical `0`) ╭──────────╮──────────╮ Driving (logical `0`) ╭──────────╮──────────╮
│ │ │ │ │ │
Floating (logical `1`) ─────────╯ ╰──────────╰───────── Floating (logical `1`) ─────────╯ ╰──────────╰─────────
│ 7 μs │── 20 μs ─│─ 12 μs ──│ │ 6 μs │── 19 μs ─│─ 13 μs ──│
The logical value during the data period signifies the bit value, e.g. a bit The logical value during the data period signifies the bit value, e.g. a bit
`0` continues the logical `0` (high potential difference between bus lines) of `0` continues the logical `0` (high potential difference between bus lines) of
the sync period thru the data period, and a bit `1` has a logical `1` the sync period thru the data period, and a bit `1` has a logical `1`
(low/floating potential between bus lines) during the data period. (low/floating potential between bus lines) during the data period. Using the
TCB pulse-width and frequency measure mode, the total bit length differs for
bit `1` and `0`; detailed bit timing can be found in "timing.h". The bus
idles at low potential (floating).
AVC LAN Frame Format AVC LAN Frame Format
│ Bits │ Description │ Bits │ Description
@ -70,7 +74,7 @@
*repeat `n` times* *repeat `n` times*
A start bit is nominally 166 us high followed by 19 us low. A start bit is nominally 169 us high followed by 20 us low.
A bit `0` is dominant on the bus, which is a design choice that affects A bit `0` is dominant on the bus, which is a design choice that affects
bit/interpretation: bit/interpretation: