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ONI100X1

The ONI100X1 is a 32bit stack engine under development by <lOninoshiko<>. It is to be implemnted on the Xilinx Sparten3 FPGA, with a 100Mhz external clock.

it calls for 3 32bit 17 element stacks (Data, Return, and A (Address)). stacks are implemnted as (modified) 32bit bi-directional shift-registers. the top element of the return stack is the program counter.

each instruction consists of 4 parts: Type, Op, Source, and Destination. Where Type starts with a 0 it is a 2 digit field leaveing 2 for Ops. where Type starts with a 1 it is a 3 digit field leaving only 1 for Ops. Source and Destination are 2 digit fields, they behave slightly strange for Type 101 operations (with one field (Dest for ! and Src for @) inidcating a memory location).

(this is highly based on the syntax of colorforth, and still needs work)

<p
TYPE    OP     SRC     DST
000     0      00      00

TYPE  000        001/010/011   100        101      110      111
SRC
00      2 data      1 data      2 data     1 data   2 data   2 data
01      2 addr      1 addr      2 addr     1 addr   2 addr   2 addr
10      2 rtrn      1 rtrn      2 rtrn     1 rtrn   2 rtrn   2 rtrn
11      2 0s        word        0s         word     word     2 0s

TYPE  000        001/010/011   100        101      110      111
DEST
00      1 data      1 data      1 data     1 data   1 data   2 data
01      1 addr      1 addr      1 addr     1 addr   1 addr   2 addr
10      1 rtrn      1 rtrn      1 rtrn     1 rtrn   1 rtrn   2 rtrn
11      drop        drop        drop       word     drop     2 drop

TYPE  OPCODE
000      0      and    LU 
000      1      or
  
001      0      not      
001      1      noop

010      0      sftl   SU
010      1      sftr

011      0      if     FU
011      1      ifc

100      0      +      AU
100      1      */noop      (only some cores include this function)

101      0      !      MCU
101      1      @

110      0      nip    SDU  (really a swap, but it drops the top)
110      1      drop        (really a noop, but it drops the top)

111      0      swap
111      1      clrflg

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