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vendor.lattice_ecp5: Add support for io with xdr=4

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This adds support for IOs with xdr=4 using the
IDDRX2F and ODDRX2F primitives.
This commit is contained in:
Konrad Beckmann 2020-07-06 16:01:19 +02:00 • committed by whitequark
parent 175c8a596e
commit 981e674081
2 changed files with 55 additions and 8 deletions
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10
nmigen/lib/io.py
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@ -26,6 +26,8 @@ def pin_layout(width, dir, xdr=0):
if dir in ("i", "io"):
if xdr > 0:
fields.append(("i_clk", 1))
if xdr > 2:
fields.append(("i_fclk", 1))
if xdr in (0, 1):
fields.append(("i", width))
else:
@ -34,6 +36,8 @@ def pin_layout(width, dir, xdr=0):
if dir in ("o", "oe", "io"):
if xdr > 0:
fields.append(("o_clk", 1))
if xdr > 2:
fields.append(("o_fclk", 1))
if xdr in (0, 1):
fields.append(("o", width))
else:
@ -78,6 +82,9 @@ class Pin(Record):
----------
i_clk:
I/O buffer input clock. Synchronizes `i*`. Present if ``xdr`` is nonzero.
i_fclk:
I/O buffer input fast clock. Synchronizes `i*` on higer gearbox ratios. Present if ``xdr``
is greater than 2.
i : Signal, out
I/O buffer input, without gearing. Present if ``dir="i"`` or ``dir="io"``, and ``xdr`` is
equal to 0 or 1.
@ -86,6 +93,9 @@ class Pin(Record):
greater than 1.
o_clk:
I/O buffer output clock. Synchronizes `o*`, including `oe`. Present if ``xdr`` is nonzero.
o_fclk:
I/O buffer output fast clock. Synchronizes `o*` on higher gearbox ratios. Present if
``xdr`` is greater than 2.
o : Signal, in
I/O buffer output, without gearing. Present if ``dir="o"`` or ``dir="io"``, and ``xdr`` is
equal to 0 or 1.