Subversion Repositories ssbcc

  BUGS:

  example

*   "<", ... operators for signed 8-bit values

  ssbcc

*   change "outstatus" to "outfull" for UART and UART_Tx

*   add size[variable_name]

    add "fetchvalueoffset(var,ix)" and "storevalueoffset(var,ix)"

    add r* to over-write either s_T or s_N?

*   accommodate Lattice Diamond synthesis and memory initialization

*   make "quiet" the default

*   ensure timer tolerance is non-zero

*   ensure all "raise" statements include the source line code number

*   write COMBINE MEMORY tests

?   bit-slice constants (similarly to parameters)

    handle ';' that aren't preceded by a space

    add fetch/store_valueoffset and fetch/store_vectoroffset

    use .IFNDEF instead of checking assembler check for previously included files

    add "rot" instruction?

    add address range validation for memory accesses

    add warning for unreachable code following .jump or .return instructions

    add "share memory" feature?

      for dual-port memories in slave peripherals (i.e., registers readable by the bus master)

      for peripherals such as adders where long chains of outputs and inports would have been required and .store+/- and .fetch+/- would be much more efficient code-wise

      how to accommodate multiple "shared memory" peripherals?

    finish interrupt handling, add monitor-interrupt peripheral to ensure correct re-enable from the interrupt handler

    remove dead parameters and dead code

    rework design as required to make it more robust

    documentation

      top-level overview, point to implemented cores

      required:  ARCHITECTURE and sizes, ASSEMBLY, and HDL

      I/O Ports

      INPORT and OUTPORT

      PERIPHERAL

        finish doc/peripheral.html

*     all error messages

    generate Altera SOPC/Qsys TCL script

    add VHDL

  core/9x8

    documentation

      update

      assembler

        directives

        instructions

          change "opcodes.html" to "instructions.html", ...

        parameters

        constants

        interrupts

      peripherals

      running the test benches

    core.v

      additional instructions?

        "invert" opcode in 6'b000100 group

        "tst&=" and "tst&<>" instructions -- replace T with the stated comparison based on the bitwise and of T and N

        "cmp=" and "cmp<>" instructions -- replace T with the statued comparison based on N-T

    asm

      require .memory directive to be repeated after other directives, EOF, etc.

      improve error message for missing input files

      add non-return-stack-alteration restriction to some optional macro arguments

      implement .abbr directive

      add .if(...) [.elif(...)]* [.else] .endif directive set

        avoid full parsing of false branches (accommodate other cores?)

        add symbol for current core -- is9x8 (?)

    peripherals

      INTERRUPT

      interrupt enable/disable (through INTERRUPT command)

      multi-byte adder

      multiplier

      PICK -- emulate the Forth operator?

        this can be done if the data stack is in its own dual-port memory, but that kinds of defeats the purpose of a small micro controller

      bus slave peripherals -- store external commands in a FIFO and statuses in dual-port RAM or shared RAM for external reads

        SPI_slave

        I2C_slave

      SoC Interconnects

        wishbone_slave

        avalon_slave

        wishbone_master

        avalon_master

        ARM_slave

    core.vhd

      do this once core.v is completed

  examples

*   Game-of-life

    add more examples

      "echo" program

      Jim Haberly -- accumulate 10 samples from an ADC

    JPEG compression example?

      Cast's JPEG-E core: http://www.cast-inc.com/ip-cores/images/jpeg-e/index.html (1343 slices, 170 MHz, 7 RAMB16, 9 DSP48)

  lib/9x8/math.s

    -- incorporate adder peripheral

    -- add_u8_u32__u32, ...

    -- sub_uX_uY__uZ, X,Y,Z \in {8,16,24,32}, Z \in min(X,Y)+{0,8}, Z<=32

    -- add signed versions

  lib/9x8/forth.s

    -- identify good instructions to include

      pick

  publicize

    - opencores

    - ssbcc.net

    - Programmable Planet

    - EETimes and other e-rags

    - add to web page