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jesd204sync: reset and check lock status of DDMTD helper PLL in firmware

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This commit is contained in:
Sebastien Bourdeauducq 2019-01-31 15:11:16 +08:00
parent fa3b40141d
commit d3c608aaec
2 changed files with 21 additions and 1 deletions
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15
artiq/firmware/libboard_artiq/jesd204sync.rs
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@ -28,6 +28,20 @@ const DDMTD_DITHER_BITS: i32 = 1;
const DDMTD_N_SHIFT: i32 = RAW_DDMTD_N_SHIFT + DDMTD_DITHER_BITS;
const DDMTD_N: i32 = 1 << DDMTD_N_SHIFT;
fn init_ddmtd() -> Result<(), &'static str> {
unsafe {
csr::sysref_ddmtd::reset_write(1);
clock::spin_us(1);
csr::sysref_ddmtd::reset_write(0);
clock::spin_us(100);
if csr::sysref_ddmtd::locked_read() != 0 {
Ok(())
} else {
Err("DDMTD helper PLL failed to lock")
}
}
}
fn measure_ddmdt_phase_raw() -> i32 {
unsafe { csr::sysref_ddmtd::dt_read() as i32 }
}
@ -276,6 +290,7 @@ pub fn sysref_rtio_align() -> Result<(), &'static str> {
}
pub fn sysref_auto_rtio_align() -> Result<(), &'static str> {
init_ddmtd()?;
test_ddmtd_stability(true, 4)?;
test_ddmtd_stability(false, 1)?;
test_slip_ddmtd()?;

7
artiq/gateware/jesd204_tools.py
View File

@ -95,11 +95,14 @@ class DDMTDEdgeDetector(Module):
class DDMTD(Module, AutoCSR):
def __init__(self, input_pads, rtio_clk_freq=150e6):
N = 64
self.reset = CSRStorage(reset=1)
self.locked = CSRStatus()
self.dt = CSRStatus(N.bit_length())
# # #
self.clock_domains.cd_helper = ClockDomain(reset_less=True)
helper_locked = Signal()
helper_fb = Signal()
helper_output = Signal()
@ -110,7 +113,8 @@ class DDMTD(Module, AutoCSR):
Instance("MMCME2_BASE",
p_CLKIN1_PERIOD=1e9/rtio_clk_freq,
i_CLKIN1=ClockSignal("rtio"),
i_RST=ResetSignal("rtio"),
i_RST=self.reset.storage,
o_LOCKED=helper_locked,
# VCO at 1200MHz with 150MHz RTIO frequency
p_CLKFBOUT_MULT_F=8.0,
@ -122,6 +126,7 @@ class DDMTD(Module, AutoCSR):
p_CLKOUT0_DIVIDE_F=8.125,
o_CLKOUT0=helper_output,
),
MultiReg(helper_locked, self.locked.status),
Instance("BUFG", i_I=helper_output, o_O=self.cd_helper.clk),
Instance("IBUFDS", i_I=input_pads.p, i_IB=input_pads.n, o_O=input_se),
Instance("FD", i_C=self.cd_helper.clk, i_D=input_se, o_Q=beat1, attr={("IOB", "TRUE")}),