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[/] [minsoc/] [trunk/] - Rev 17

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17 Ethernet testbench speed penalty solved. Now Ethernet of testbench and minsoc can be enabled by only uncommenting `define ETHERNET on minsoc_defines.v.

send_mac, get_mac and uart_send tasks have been included/improved. Also a testbench, which works for both included firmwares is added. (eth and uart)

If ETHERNET is defined for the SoC, both firmwares will complete successfully. If not, the eth firmware will stall when trying to access the Ethernet module.
rfajardo 3989d 16h /minsoc/trunk/
16 Further initialization improvement of non-used signals, setting interrupt signals to 0 if module is not used. rfajardo 3994d 19h /minsoc/trunk/
15 Including verified pinout for external spi flash on spartan3a dsp kit to its correspondent ucf constraint file. rfajardo 3995d 13h /minsoc/trunk/
14 Wishbone error signal of Ethernet core was not tied to ground if Ethernet was disabled. Solved now. rfajardo 4003d 20h /minsoc/trunk/
13 Updating spartan3e_starter_kit.ucf so that it does not deliver errors on mapping. Moreover it has been changed to off the shelf only have uart support. Ethernet support and generic JTAG can be added by uncommenting the corresponding lines. rfajardo 4004d 20h /minsoc/trunk/
12 1) spi_top.v:
-TX_NEGEDGE bug reported and recommended solution by Blaise Gassend. (Thank you)
2) minsoc howto extended to:
-synthesis of minsoc for Spartan3E Starter Kit with Ethernet
3) spartan3e_starter_kit.ucf changed:
-it had problems regarding pin definitions and IO logic types for mapping and place&route. Working flawless now.
rfajardo 4007d 12h /minsoc/trunk/
11 External interrupt processing was being run multiple times because:
-external level interrupts have to be cleared
-internal interrupt status register has to be cleared
Since internal interrupt status register was being cleared before external level interrupts clearance, these internal interrupt status was being overwritten inbetween.

Solution:
-move status register reset to end of interrupt handler instead of beginning.

Testbench signal uart_srx initialized now.
rfajardo 4014d 16h /minsoc/trunk/
10 Added a file containing models for each FPGA memory instances used in or1200. The file is in bench/verilog/sim_lib/fpga_memory_primitives.v.

With it, people who change the or1200_defines.v inside of the project structure will still be able to simulate, using house-made models, not from manufacturers.

minsoc_bench.v had to be extended by the task, init_fpga_memory, to initialize the dual or two port memories instances of or1200. This has to be done based on the type of memory used, so many different instantiations based on definitions. Somehow or1200 expects all memory values to be 0 upon start, so this is necessary.
rfajardo 4028d 15h /minsoc/trunk/
9 Tiny change to testbench gain:
-uart_srx is now reg for future testbench serial input to SoC.
rfajardo 4030d 14h /minsoc/trunk/
8 Cosmetic changes to minsoc_bench.v:
-reset and clock initialization are included into the main initial block, it had an own block before
rfajardo 4030d 14h /minsoc/trunk/
7 Some changes:
-wb_cabs removed from minsoc_top.v and minsoc_tc_top.v
-added reset polarity control to minsoc_defines.v through:
-POSITIVE_RESET
-NEGATIVE_RESET
-minsoc_onchip_ram_top.v does not use
minsoc_onchip_ram.v oe signals (output enable) anymore,
which are implemented as tristate buffers. Now
minsoc_onchip_ram_top.v has a generated MUX, which
has an arbitrary number of inputs and 1 output.
Input are the internal output of the onchip_rams,
output the wb_dat_o.
rfajardo 4035d 14h /minsoc/trunk/
6 No implementation relevant changes.

Testbench used generic memory from minsoc_onchip_ram.v has been changed to reflect the correct model of the FPGA's onchip rams: address register and write accesses are sensitive to rising clock edge.

Documentation updated to reflect another trial and next steps to speed up the memory access from 2 clocks to 1. The negated clock approach is not standard. The right way to do it would be to use the wishbone signals cti and bte and change the minsoc_onchip_ram_top.v.
rfajardo 4039d 21h /minsoc/trunk/
5 vpi path corrected in how to. rfajardo 4045d 20h /minsoc/trunk/
4 minsoc_bench.v had a big memory declaration to load the firmware, which was not necessary.

jp-io-vpi.vpi has to be compiled for different systems so removed from the project. Documentation now explains how to do it.

Documentation now includes:
-vpi module compilation
-gdb patch for adv_jtag_bridge
-ideas for future work on minsoc (To Do v.2)
rfajardo 4045d 20h /minsoc/trunk/
3 Changed documentation
-advice to compile sw/utils before compiling target software
rfajardo 4049d 18h /minsoc/trunk/
2 First commit of project. Beta status:
-testbench: working
-firmware: working
-RTL: Working for: Xilinx Spartan-3A DSP Development Kit
rfajardo 4049d 19h /minsoc/trunk/
1 The project was created and the structure was created root 4049d 20h /minsoc/trunk/

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