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| sagar_acharya | Folks I have this really basic doubt | 11:07 |
|---|---|---|
| sagar_acharya | assign vga_clk = clk_div[1]; | 11:08 |
| sagar_acharya | reg[1:0]clk_div; | 11:08 |
| sagar_acharya | wirevga_clk; | 11:08 |
| sagar_acharya | In above statements. vga_clk will have what time period? | 11:09 |
| ikskuh | you increment clk_div every clk? | 11:09 |
| sagar_acharya | Yes, on every posedge | 11:09 |
| ikskuh | i guess 1/4 clk | 11:09 |
| sagar_acharya | It's not my code. I'm just trying to understand | 11:09 |
| sagar_acharya | How? | 11:09 |
| sagar_acharya | Shouldn't it be 1/2 | 11:09 |
| ikskuh | no | 11:10 |
| sagar_acharya | Since we have 00, 01, 10, and 11. | 11:10 |
| ikskuh | incrementing on every clk means that you toggle clk_div[0] on every clk | 11:10 |
| ikskuh | thus, clk_div[0] has 1/2 freq of clk | 11:10 |
| sagar_acharya | So clk_div[1] should be 0 0 and then 1 1 right | 11:10 |
| sagar_acharya | aah alright | 11:10 |
| sagar_acharya | ikskuh: Thanks | 11:12 |
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| sagar_acharya | I see there's some syntax like | 17:29 |
| sagar_acharya | module top #()(); | 17:30 |
| sagar_acharya | There are parameters within first brackets | 17:30 |
| sagar_acharya | What's that? | 17:30 |
| sagar_acharya | Is it some convention | 17:30 |
| sagar_acharya | Also, does yosys synthesize initial blocks? | 17:32 |
| sagar_acharya | I learnt in 1 course that synthesis tools don't support initial. | 17:32 |
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| sagar_acharya | Can someone please explain what picosoc is? | 18:19 |
| sagar_acharya | wrt picorv32 processor implemented. | 18:20 |
| xiretza[m] | does the readme help? https://github.com/YosysHQ/picorv32/tree/master/picosoc#readme | 18:20 |
| sagar_acharya | I did read that. I'm a newbie so I still don't get it. | 18:22 |
| sagar_acharya | I understand how rv32 is implemented | 18:22 |
| sagar_acharya | I don't get what they mean by soc. | 18:22 |
| sagar_acharya | >It can be used as a turn-key solution for simple control tasks in | 18:22 |
| sagar_acharya | ASIC and FPGA designs. | 18:22 |
| mwk | sagar_acharya: yosys does indeed recognize and support initial blocks | 18:22 |
| mwk | specifically ones that initialize registers and memories | 18:22 |
| sagar_acharya | mwk: Thanks | 18:23 |
| mwk | about synthesis tools not supporting initial: that's generally a property of ASIC synthesis tools; FPGA tools tend to support them | 18:23 |
| mwk | because in ASICs you don't really get to pick the starting state of the registers | 18:24 |
| sagar_acharya | Aah yes, true. | 18:24 |
| xiretza[m] | picorv32 is purely a processor core, it can't do anything on its own because it doesn't even have anywhere to store instructions - so you attach some peripherals to it (at least some memory and some kind of I/O), and call it a soc | 18:24 |
| mwk | it's not a hard rule; for example the sf2 target in yosys doesn't support initial, due to lack of such capability in hardware | 18:25 |
| mwk | and as for soc | 18:26 |
| mwk | it means "system on chip" | 18:26 |
| mwk | ie. cpu core + whatever peripherials you need to communicate with outside world | 18:26 |
| mwk | usually written as SoC | 18:27 |
| sagar_acharya | For now, I need to implement, vga, ps2, a simple shell and rv32. | 18:27 |
| mwk | SoC can be anything from something simple like picosoc to something very complex like the ARM chips found in smartphones | 18:27 |
| sagar_acharya | So will vga and ps2 verilog modules + picosoc do such a thing? | 18:28 |
| sagar_acharya | I was thinking some shell program compiled from C for rv32 should work. I have no idea though. | 18:28 |
| mwk | doing homework, aren't we | 18:28 |
| sagar_acharya | mwk: meaning? | 18:28 |
| mwk | picosoc + vga + ps2 can make for a usable system, as far as hardware goes | 18:29 |
| mwk | software stack is another thing | 18:29 |
| sagar_acharya | I mean if I compile some shell program from C, it could be run on rv32 and displayed on screen right? | 18:30 |
| sagar_acharya | I want a very old OS type thing like | 18:30 |
| sagar_acharya | shell -> program A -> shell | 18:30 |
| sagar_acharya | shell -> program B -> shell | 18:30 |
| xiretza[m] | you'll at least have to write some drivers for your VGA and PS2 peripherals | 18:31 |
| mwk | if you want an OS, you have to write or otherwise obtain an OS | 18:31 |
| sagar_acharya | Yes, I have taken them from another code, xiretza | 18:31 |
| sagar_acharya | Naah, those OSes are out of the world complex. | 18:31 |
| sagar_acharya | I need just shell display and a couple cryptography programs. | 18:32 |
| sagar_acharya | 1st thing is just shell for now. | 18:32 |
| sagar_acharya | shell with echo program | 18:32 |
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| sagar_acharya | ok, I'll start with vga + ps2 + picosoc then. Thanks folks! | 18:34 |
| sagar_acharya | mwk and xiretza! | 18:35 |
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