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| sagar_acharya | Hello folks. I was trying to understand rv32 picosoc | 12:26 |
|---|---|---|
| sagar_acharya | hx8k demo. I have Olimex HX8K board which is different from the starter board for which this is made. | 12:27 |
| sagar_acharya | *Breakout Board | 12:27 |
| sagar_acharya | What would I have to do different for Olimex Board? | 12:28 |
| sagar_acharya | Can people listen to me? | 12:31 |
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| ikskuh | heya sagar_acharya o/ | 12:48 |
| ikskuh | i guess you have to adjust some pins? i don't know both of these boards, but they both have an ICE40, right? | 12:49 |
| sagar_acharya | Yes | 12:53 |
| sagar_acharya | I'll manage pcf. | 12:53 |
| sagar_acharya | That's it, everything else stays same? | 12:53 |
| ikskuh | i guess so? maybe you need to adjust to different clock sources | 12:54 |
| ikskuh | for that you have to look up the schematic | 12:54 |
| sagar_acharya | ok. I don't understand soc. I understand rv32 though. | 12:55 |
| sagar_acharya | So can I use C code on it? | 12:55 |
| sagar_acharya | With soc. I'm trying to create basic shell with ps2 keyboard, vga, character encoding and rv32 core for running programs | 12:56 |
| sagar_acharya | breakout board has 12MHz oscillator and olimex board has 100MHz. Keeping clock same should be fine right | 12:58 |
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| ikskuh | ah, so you're a beginner when it comes to hw dev? | 13:09 |
| sagar_acharya | Yes | 13:10 |
| sagar_acharya | I know some basics though. | 13:11 |
| tnt | I seriously doubt the hx8k is going to run the picorv32 at 100 MHz, you'll need to PLL that down. | 13:12 |
| sagar_acharya | Where is the clock signal, I just see input clk | 13:13 |
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| sagar_acharya | or is clk a keyword. | 13:14 |
| tnt | ??? well yeah, 'clk' is the clock signal .... | 13:14 |
| tnt | it's not a keyword, it's just a random name. | 13:15 |
| tnt | but that's linked with the pcf to a specific pin of the fpga where the board inputs a clock signal. | 13:15 |
| sagar_acharya | Aah ok | 13:15 |
| sagar_acharya | Thanks | 13:15 |
| sagar_acharya | That makes sense now | 13:15 |
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| ikskuh | what's the way-to-go to figure out of an addition overflowed? | 17:58 |
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| tnt | just extend the signals by 1 bit before addition. | 18:01 |
| ikskuh | ah, perfec | 18:02 |
| ikskuh | so | 18:02 |
| ikskuh | assign {carry, res} = { 1'b0, a } + { 1'b0, b }; ? | 18:02 |
| tnt | yeah, for unsigned addition at least. | 18:02 |
| ikskuh | oh right, for signed i have to do sign extension, right? | 18:03 |
| tnt | well, not for just checking for overflow IIRC, but the condition is different, tbh I don't remember like that, you'd need to go through the various cases on paper and see how it works out. | 18:05 |
| ikskuh | dang. i knew putting carry in was a bad idea ^^ | 18:06 |
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