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Conv TTL RS485 - Gateware
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Conv TTL RS485 - Gateware
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3173b753
Commit
3173b753
authored
Feb 22, 2018
by
Denia Bouhired-Ferrag
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DOC: wip unfinished modifications of gateware guide
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4d40bcc3
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conv-regs.tex
doc/hdlg/conv-regs.tex
+533
-308
hdlg-conv-ttl-rs485.tex
doc/hdlg/hdlg-conv-ttl-rs485.tex
+17
-0
testbench.vhd
sim/testbench.vhd
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doc/hdlg/conv-regs.tex
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doc/hdlg/hdlg-conv-ttl-rs485.tex
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...
@@ -268,6 +268,21 @@ OSWR (see Appendix~\ref{app:memmap}), as shown in Figure~\ref{fig:switches}.
...
@@ -268,6 +268,21 @@ OSWR (see Appendix~\ref{app:memmap}), as shown in Figure~\ref{fig:switches}.
\caption
{
\label
{
fig:switches
}
Switch input logic
}
\caption
{
\label
{
fig:switches
}
Switch input logic
}
\end{figure}
\end{figure}
%==============================================================================
% SEC: PCB Version
%==============================================================================
\subsection
{
PCB Version
}
\label
{
sec:pcb-ver
}
CONV-TTL-RS485 boards from version 4 onwards, offer the possibility for the FPGA to receive
information on the hardware version. This information is hardwired on the board in the form of
pulled-up or pulled-down resistors for each of the 6 lines~
\cite
{
conv-ttl-RS485-hwguide
}
(4 bits for the PCB version number, and 2 bits for the execution).
The PCB version is stored as 6 bits inside the Status Register of the memory map~
\ref
{
app:memmap
}
for diagnotics.
Since the hardware version is not available on older boards and since the I/O pins now assigned to it were by default pulled-
down, boards v3 and earlier will show the PCB version as 000000.
%==============================================================================
%==============================================================================
\pagebreak
\pagebreak
\section
{
Output logic
}
\section
{
Output logic
}
...
@@ -294,6 +309,8 @@ when it is OFF.
...
@@ -294,6 +309,8 @@ when it is OFF.
%==============================================================================
%==============================================================================
\subsection
{
Pulse LED output logic
}
\subsection
{
Pulse LED output logic
}
\label
{
sec:pulse-led
}
\label
{
sec:pulse-led
}
\textit
{
Note that this very same logic has been moved inside conv-common-gw submodule
for inverted channels.
}
\\
Since in the CONV-TTL-RS485 schematics the rear-panel pulse LEDs are driven from inverting
Since in the CONV-TTL-RS485 schematics the rear-panel pulse LEDs are driven from inverting
Schmitt triggers to ground, the active-high pulse LED output from
\textit
{
conv
\_
common
\_
gw
}
Schmitt triggers to ground, the active-high pulse LED output from
\textit
{
conv
\_
common
\_
gw
}
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