whitequark
b42043f764
lib.io: add i_clk and o_clk to pin layout with xdr>=1.
2019-06-03 07:43:31 +00:00
whitequark
1eee7cd76f
lib.io: allow dir="oe".
...
Although a dir="oe" pin is generally equivalent to dir="io" pin with
the i* signal(s) disconnected, they are not equivalent, because some
pins may not be able to support input buffers at all, either because
there are no input buffers, or because the input buffers are consumed
by some other resource.
E.g. this can happen on iCE40 when the input buffer is consumed by
a PLL.
2019-06-03 04:28:53 +00:00
whitequark
c30617fc05
lib.io: allow Pin(xdr=0), representing a combinatorial I/O buffer.
2019-06-03 03:36:32 +00:00
Jean-François Nguyen
6a77122c2e
lib.io: add a name argument to the Pin constructor.
2019-04-24 22:02:20 +00:00
whitequark
44711b7d08
hdl.ir: detect elaboratables that are created but not used.
...
Requres every elaboratable to inherit from Elaboratable, but still
accepts ones that do not, with a warning.
Fixes #3 .
2019-04-21 08:52:57 +00:00
whitequark
287a0531b3
lib.io: rework TSTriple/Tristate interface to use pin_layout/Pin.
2019-04-15 16:27:23 +00:00
Luke Wren
23a07b955f
lib.cdc: add optional reset to MultiReg, and document its use cases.
2019-03-28 05:21:48 +00:00
whitequark
4027317835
lib.fifo: register GrayEncoder output before CDC.
...
Without this register, static hazards in the encoder could cause
multiple encoder output bits to toggle, which would be incorrectly
sampled by the 2FF synchronizer.
Reported by @Wren6991.
2019-03-03 18:23:51 +00:00
whitequark
f44ca291c1
lib.cdc: add ResetSynchronizer.
2019-01-26 18:07:59 +00:00
whitequark
4948162f33
hdl.ir: rename .get_fragment() to .elaborate().
...
Closes #9 .
2019-01-26 02:31:12 +00:00
whitequark
7b25665fde
back.pysim: fix behavior of initial cycle for sync processes.
...
The current behavior was introduced in 6570271912e04e4e657027191782b841
2019-01-25 20:37:56 +00:00
whitequark
1782b841b2
lib.fifo: in FIFOInterface.read(), check readable on the right cycle.
2019-01-22 07:03:46 +00:00
whitequark
2c80f35de4
lib.fifo: fix typo in AsyncFIFO documentation.
2019-01-22 05:47:50 +00:00
whitequark
e33580cf4c
lib.fifo: add AsyncFIFO and AsyncFIFOBuffered.
2019-01-21 16:02:46 +00:00
whitequark
b6cff2c098
lib.coding: add GrayEncoder and GrayDecoder.
...
Unlike the Migen ones, these are purely combinatorial.
2019-01-20 02:20:34 +00:00
whitequark
9757157fe2
lib.coding: add width as attribute to all coders.
2019-01-20 01:59:09 +00:00
whitequark
3ed519383c
lib.fifo: fix simulation read/write methods to take only one cycle.
2019-01-19 01:38:09 +00:00
whitequark
97b990272e
lib.fifo: formally verify FIFO contract.
2019-01-19 00:52:56 +00:00
whitequark
5a831ce31c
lib.fifo: add basic formal specification.
2019-01-17 05:40:25 +00:00
whitequark
b78a2be9f6
lib.fifo: port sync FIFO queues from Migen.
2019-01-16 17:20:38 +00:00
whitequark
c4276f7cf7
lib.io: pass pin to platform.get_tristate().
2019-01-14 21:39:19 +00:00
whitequark
b534e92dd5
hdl.ir: allow explicitly requesting flattening.
2019-01-14 17:04:23 +00:00
whitequark
6f66885c09
lib.io: lower to platform-independent tristate buffer.
2019-01-14 16:50:04 +00:00
whitequark
3ea35b8566
lib.coding: fix tests to actually run, and fix code to fix tests.
2018-12-27 21:45:55 +00:00
whitequark
528747703d
lib.coding: port from Migen.
2018-12-26 13:19:34 +00:00
whitequark
790eb05a92
Rename fhdl→hdl, genlib→lib.
2018-12-15 14:25:31 +00:00
