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| BugsBoard: a Forth MCU on the Digilent Cmod S7 board http://anycpu.org/forum/viewtopic.php?f=15&t=1074 |
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| Author: | Myron Plichota [ Tue Aug 29, 2023 10:20 am ] |
| Post subject: | BugsBoard: a Forth MCU on the Digilent Cmod S7 board |
BugsBoard is an improvement on my previous forthBoard project. The instruction set has been further optimized for DSP apps. BugsBoard_Primer.pdf is at https://drive.google.com/file/d/14iPt_j ... sp=sharing The Downloads section has a link to the entire source code. |
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| Author: | BigEd [ Tue Aug 29, 2023 12:55 pm ] |
| Post subject: | Re: BugsBoard: a Forth MCU on the Digilent Cmod S7 board |
. Some interesting ideas in there! From your doc: Quote: The data and address widths are 18 bits. 8-bit chars are right-justified 18-bit quantities. Registers: 1) the 16-bit program counter (always points within 64Kx18-bit RAM) 2) the 18-bit instruction packet register at the heart of CPU control logic 3) the 16x18-bit parameter stack 4) the 16x18-bit return stack 5) the 1-bit carry out from the most-recent add The program counter addresses complete instruction packets containing 1 or 4 instructions, not the individual instructions within a packet. A Cooley-Tukey 512-point complex radix-2 DIT FFT has been timed to run in 390894 clock cycles or ~8.14 ms. Also, for reference, 48MHz, single-cycle access to on-chip RAM. |
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| Author: | Myron Plichota [ Tue Aug 29, 2023 10:12 pm ] |
| Post subject: | Re: BugsBoard: a Forth MCU on the Digilent Cmod S7 board |
Hi BigEd, it's been a while. It's amazing what can be done with 19 instructions. I'm having a good time with audio apps (e.g. FM synth, IIR lowpass filter) at a 46875 Hz sampling rate. I think BugsBoard would be a good trainer for modern youngsters, like we enjoyed in the 8-bit days. |
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