URL
https://opencores.org/ocsvn/zpu/zpu/trunk
Subversion Repositories zpu
Compare Revisions
- This comparison shows the changes necessary to convert path
/
- from Rev 67 to Rev 68
- ↔ Reverse comparison
Rev 67 → Rev 68
/trunk/zpu/docs/zpu_arch.html
12,6 → 12,7
<li> <a href="#memorymap">Memory map</a> |
<li> <a href="#interrupts">Interrupts</a> |
<li> <a href="#performance">Speeding up the ZPU</a> |
<li> <a href="#debuguart">Debug channel / UART</a> |
<li> <a href="#wishbone">Wishbone</a> |
<li> <a href="#zpu_core_small.vhd">About zpu_core_small.vhd</a> |
<li> <a href="#zpu_core.vhd">About zpu_core.vhd</a> |
1040,7 → 1041,7
</TD> |
<TD WIDTH=136> |
<P LANG="en-US" CLASS="western" ALIGN=CENTER><FONT FACE="Arial, sans-serif"><FONT SIZE=2 STYLE="font-size: 9pt">ZPU |
UART to ARM7 TX</FONT></FONT></P> |
Debug channel / UART to ARM7 TX</FONT></FONT></P> |
<P LANG="en-US" CLASS="western" ALIGN=CENTER><FONT FACE="Arial, sans-serif"><FONT SIZE=2 STYLE="font-size: 9pt"><B>NOTE! |
ZPU side</B></FONT></FONT></P> |
</TD> |
1066,7 → 1067,7
</TD> |
<TD WIDTH=136> |
<P LANG="en-US" CLASS="western" ALIGN=CENTER><FONT FACE="Arial, sans-serif"><FONT SIZE=2 STYLE="font-size: 9pt">ZPU |
UART to ARM7 RX</FONT></FONT></P> |
Debug channel / UART to ARM7 RX</FONT></FONT></P> |
<P LANG="en-US" CLASS="western" ALIGN=CENTER><FONT FACE="Arial, sans-serif"><FONT SIZE=2 STYLE="font-size: 9pt"><B>NOTE! |
ZPU side</B></FONT></FONT></P> |
</TD> |
1160,7 → 1161,7
<P LANG="en-US" CLASS="western"><FONT FACE="Arial, sans-serif"><FONT SIZE=2 STYLE="font-size: 9pt">Bit |
[31:1] Not used</FONT></FONT></P> |
<P LANG="en-US" CLASS="western"><FONT FACE="Arial, sans-serif"><FONT SIZE=2 STYLE="font-size: 9pt">Bit |
[0] UART RX interrupt enable</FONT></FONT></P> |
[0] Debug channel / UART RX interrupt enable</FONT></FONT></P> |
<P LANG="en-US" CLASS="western"><FONT FACE="Arial, sans-serif"><FONT SIZE=2 STYLE="font-size: 9pt"> 0 Interrupt |
disable</FONT></FONT></P> |
<P LANG="en-US" CLASS="western"><FONT FACE="Arial, sans-serif"><FONT SIZE=2 STYLE="font-size: 9pt"> 1 Interrupt |
1182,7 → 1183,7
<P LANG="en-US" CLASS="western"><FONT FACE="Arial, sans-serif"><FONT SIZE=2 STYLE="font-size: 9pt">Bit |
[31:1] Not used</FONT></FONT></P> |
<P LANG="en-US" CLASS="western"><FONT FACE="Arial, sans-serif"><FONT SIZE=2 STYLE="font-size: 9pt">Bit |
[0] UART RX interrupt pending (Read)</FONT></FONT></P> |
[0] Debug channel / UART RX interrupt pending (Read)</FONT></FONT></P> |
<P LANG="en-US" CLASS="western"><FONT FACE="Arial, sans-serif"><FONT SIZE=2 STYLE="font-size: 9pt"> 0 No |
interrupt pending</FONT></FONT></P> |
<P LANG="en-US" CLASS="western"><FONT FACE="Arial, sans-serif"><FONT SIZE=2 STYLE="font-size: 9pt"> 1 Interrupt |
1455,6 → 1456,25
a non-starter and a more conventional RISC design makes more sense here. |
<p> |
The unique advantages of the ZPU is size in terms of HDL & code size. |
<a name="debuguart"/> |
<h1>Debug channel / UART</h1> |
All self respecting embedded projects should have a debug channel |
to print stuff to. Typically this is a standard RS232 or UART, but |
it can also be something more exotic like a DCC JTAG channel. |
<p> |
The point is that characters(bytes) are sent to/from the ZPU |
via some terminal. |
<p> |
The ZPU defines in the memory map a UART / debug channel. This |
should be implemented by some suitable debug channel for |
the device in which the ZPU is implemented. |
<p> |
www.opencores.org has several UART implementations. This is one |
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> |
|
<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 |