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| rohitksingh_work | cr1901_modern: ping? | 08:58 |
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| nancy98[m] | mithro ping ! Can we please have a meeting regarding the project ! | 14:26 |
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| mithro | nancy98[m]: It seems unlikely we can make a time work at the moment - do you want to send an email? | 17:04 |
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| cr1901_modern | rohitksingh: Pong | 18:10 |
| rohitksingh | cr1901_modern: you are much more familiar with migen. could you please take a look at this line: https://github.com/m-labs/migen/blob/master/migen/genlib/cdc.py#L110 | 18:15 |
| tpb | Title: migen/cdc.py at master · m-labs/migen · GitHub (at github.com) | 18:15 |
| cr1901_modern | Phew, ngl... I forget how this works and I had the same question as you at one point :P | 18:16 |
| rohitksingh | it seems to me that the, self._pong.i expects input signal in 'odomain' whereas self._ping.i signal is in 'idomain' clock domain | 18:16 |
| cr1901_modern | rohitksingh: This'll take me a bit to (re)study | 18:16 |
| rohitksingh | cr1901_modern: oh sure, no issues...I remembered you had used CDC in your frequency counter ip project, so thought to ask you :) | 18:18 |
| cr1901_modern | rohitksingh: I usually use a asyncFIFO for multi signal CDC | 18:19 |
| rohitksingh | cr1901_modern: oh okay...even _florent_ seems to have used BusSynchronizer only in dram bist core, and no where else...I'm not sure whether that highlighted line is correct | 18:20 |
| cr1901_modern | My issue w/ BusSynchronizer _IIRC_ is that it's difficult to predict latency of when the value in the source will finally propogate to the dest domain | 18:21 |
| rohitksingh | yup that too! there is no way to know when the value will propagate, and there are no handshake signals | 18:22 |
| cr1901_modern | B/c there's a "token" loop between source and dest that's multiple taps long (think like a ring buffer), and src and dst can only send/rcv values when the token is in the right position | 18:22 |
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