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-rw-r--r--zpu/docs/zpu_arch.html10
1 files changed, 9 insertions, 1 deletions
diff --git a/zpu/docs/zpu_arch.html b/zpu/docs/zpu_arch.html
index 5404057..67a572e 100644
--- a/zpu/docs/zpu_arch.html
+++ b/zpu/docs/zpu_arch.html
@@ -1582,7 +1582,15 @@ of the simpler ones:
<a href="http://www.opencores.org/projects.cgi/web/uart/overview">
http://www.opencores.org/projects.cgi/web/uart/overview</a>
-
+<h2>Implementing your own UART / debug channel</h2>
+The first thing you need to do is to choose a debug channel for your
+hardware. This could be a UART, but it doesn't have to be.
+<p>
+Secondly you should write a small HDL module that interface between
+the ZPU memory map of debug channel to the UART. This should
+ be relatively simple as all you need to do is to let the ZPU
+ query the FIFO in/out for busy flag and allow the ZPU to read/write
+ data to the UART via the memory map.
<a name="zpu_core.vhd"/>
<h1>About zpu_core.vhd</h1>
The zpu_core.vhd has a single port memory interface. All data, code and IO is
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