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urukul: support configurable refclk divider 

for #1248
This commit is contained in:
Robert Jördens 2019-01-18 10:02:18 +00:00
parent a467b8f851
commit 2bea5e3d58
1 changed files with 15 additions and 5 deletions
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20
artiq/coredevice/urukul.py
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@ -31,6 +31,7 @@ CFG_CLK_SEL1 = 21
CFG_SYNC_SEL = 18
CFG_RST = 19
CFG_IO_RST = 20
CFG_CLK_DIV = 22
# STA status register bit offsets
STA_RF_SW = 0
@ -54,7 +55,7 @@ CS_DDS_CH3 = 7
@portable
def urukul_cfg(rf_sw, led, profile, io_update, mask_nu,
clk_sel, sync_sel, rst, io_rst):
clk_sel, sync_sel, rst, io_rst, clk_div):
"""Build Urukul CPLD configuration register"""
return ((rf_sw << CFG_RF_SW) |
(led << CFG_LED) |
@ -65,7 +66,8 @@ def urukul_cfg(rf_sw, led, profile, io_update, mask_nu,
((clk_sel & 0x02) << (CFG_CLK_SEL1 - 1)) |
(sync_sel << CFG_SYNC_SEL) |
(rst << CFG_RST) |
(io_rst << CFG_IO_RST))
(io_rst << CFG_IO_RST) |
(clk_div << CFG_CLK_DIV))
@portable
@ -133,6 +135,11 @@ class CPLD:
internal MMCX. For hardware revision <= v1.2 valid options are: 0 -
either XO or MMCX dependent on component population; 1 SMA. Unsupported
clocking options are silently ignored.
:param clk_div: Reference clock divider. Valid options are 0: variant
dependent default (divide-by-4 for AD9910 and divide-by-1 for AD9912);
1: divide-by-1; 2: divide-by-2; 3: divide-by-4.
On Urukul boards with CPLD gateware before v1.3.1 only the default
(0, i.e. variant dependent divider) is valid.
:param sync_sel: SYNC (multi-chip synchronisation) signal source selection.
0 corresponds to SYNC_IN being supplied by the FPGA via the EEM
connector. 1 corresponds to SYNC_OUT from DDS0 being distributed to the
@ -148,16 +155,18 @@ class CPLD:
`sync_device` was specified).
:param core_device: Core device name
"""
kernel_invariants = {"refclk", "bus", "core", "io_update"}
kernel_invariants = {"refclk", "bus", "core", "io_update", "clk_div"}
def __init__(self, dmgr, spi_device, io_update_device=None,
dds_reset_device=None, sync_device=None,
sync_sel=0, clk_sel=0, rf_sw=0,
sync_sel=0, clk_sel=0, clk_div=0, rf_sw=0,
refclk=125e6, att=0x00000000, sync_div=None,
core_device="core"):
self.core = dmgr.get(core_device)
self.refclk = refclk
assert 0 <= clk_div <= 3
self.clk_div = clk_div
self.bus = dmgr.get(spi_device)
if io_update_device is not None:
@ -177,7 +186,8 @@ class CPLD:
self.cfg_reg = urukul_cfg(rf_sw=rf_sw, led=0, profile=0,
io_update=0, mask_nu=0, clk_sel=clk_sel,
sync_sel=sync_sel, rst=0, io_rst=0)
sync_sel=sync_sel,
rst=0, io_rst=0, clk_div=clk_div)
self.att_reg = int32(int64(att))
self.sync_div = sync_div