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FMC DEL 1ns 4cha - Software
Commit 1b3097a6 authored by Alessandro Rubini's avatar Alessandro Rubini
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doc clarification about use of the offsets 

Signed-off-by: Alessandro Rubini's avatarAlessandro Rubini <rubini@gnudd.com>
parent d6f61a47
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doc/fine-delay.in
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......@@ -1521,10 +1521,15 @@ read by the actual reading process).
The @i{offset} attribute
is the stamping offset, in picoseconds, for the TDC channel.
The hardware timestamper's time-base is shifted backwards, so the
driver adds this offset to the raw timestamps it collects. Users should
not change this value, that depends on how hardware and HDL is designed.
The @i{user-offset} attribute, which defaults to 0 every time the
driver is loaded, is a
signed value that users can write to represent a number of picoseconds
to be added (or subtracted) to the hardware-reported stamps. This is
to be added (or subtracted, if negative)
to the hardware-reported stamps. This is
used to account for delays induced by cabling (range: -2ms to 2ms).
The @i{flags} attribute can be used to change three configuration
......@@ -1992,12 +1997,9 @@ from the user-requested delay (@i{start} fields) when generating output
pulses. It represents internal card delays. The value can be modified
from @i{sysfs}.
@b{Note:} the @i{delay-offset} is used for delay mode but not
for pulse-generation mode.
The @i{user-offset} attribute, which defaults to 0 at module load time, is a
signed value that users can write to represent a number of picoseconds
to be added (or subtracted) to every user-command (for both delay
to be added (or subtracted) to every user command (for both delay
and pulse generation). This is used to account for delays induced by
cabling (range: -2ms to 2ms). The value can be modified
from @i{sysfs}.
......
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