Wednesday, 2021-05-12

« Tuesday, 2021-05-11 Index Thursday, 2021-05-13 »
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DurandAHi. I am looking for some help to use CSRs (not CSRStatus or CSRStorage). Specifically, I try to do a self-resetting CSR. Currently, the CPU/remote has to send a pulse to an "enable" CSRStorage.04:32
DurandAI didn't find something like that in the codebase. Thanks for your ideas.04:34
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nickoe_florent_ Did you see my "question" in https://github.com/enjoy-digital/litedram/issues/251#issuecomment-835897878 ?16:53
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nickoezyp: Mm, is this the correct to create a nullsink with the stream endpoint? https://pastebin.com/raw/5jYVhtjc20:04
zypyes20:05
zypand a nullsource would equivalently have valid always high20:05
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nickoemm, but then I wonder why this does not appear to work :S20:12
nickoehttps://i.snipboard.io/Nexv3K.jpg20:13
nickoezyp: With this code https://pastebin.com/raw/p5UTedKw20:13
nickoeso I just connected the dma to the nullsink20:14
nickoebut why does the dma source ready signal go low?20:14
nickoeoh, I also have the cdc in between, but it should still not do that all the time.20:16
zypself.comb += dma.source.connect(cdc.sink)20:16
zypself.comb += cdc.sink.connect(nullsink.sink)20:16
zypthat should be cdc.source20:16
nickoeOhh, nice. I must be blind today.20:17
zypalso, you might want to use a Pipeline() to hook this up20:17
zypPipeline(dma, cdc, nullsink) is a bit more readable than what you've got now :)20:17
nickoeI can't finde that, is that a litex thing or migen?20:18
zypit's in litex.soc.interconnect.stream20:18
zyplike all other stream constructs20:18
nickoeok, I see it20:18
nickoenot sure what was wrong with my search thing20:19
zypI suggest you have a read through that module, it's got a bunch of convenient building blocks20:19
nickoeyeah, well, but not a hell lot of documentaiton :S So it is hard to find what "I didn't know I needed" when I don't know what they do. :D20:20
nickoebut that do look more readable indeed.20:20
nickoeBut at least I am sorta getting the gang of understanding the internals with a glance20:26
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nickoezyp: Why does it appear that this storage is equal to 3? no matter what reset value I set it to?20:36
nickoehttps://pastebin.com/raw/ThntnD5t20:36
zypis it not hooked up to anything?20:37
nickoelike this https://github.com/nickoe/litex-boards/blob/mars_ax3_sim/litex_boards/targets/mars_ax3_custom.py#L29520:38
nickoeI just tried to disconnect it from the module..20:38
nickoeto see if that changes maters20:38
nickoethere is also this? https://github.com/nickoe/litex-boards/blob/mars_ax3_sim/litex_boards/targets/mars_ax3_custom.py#L32320:39
nickoe                If(self.upsample_num.re,20:39
nickoeEven if I remove any uses of it it is till just 320:42
nickoeeven with https://pastebin.com/raw/6kkB0H7d20:43
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