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hmc7043,satman: verify alignment of SYSREF slips

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This commit is contained in:
Sebastien Bourdeauducq 2018-06-27 17:36:13 +08:00
parent 7dfd70c502
commit 46c044099c
3 changed files with 15 additions and 9 deletions
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2
artiq/firmware/libboard_artiq/ad9154.rs
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@ -769,7 +769,7 @@ pub fn init(sysref_phase_fpga: u16, sysref_phase_dac: u16) {
// the HMC7043 input clock (which defines slip resolution)
// is 2x the DAC clock, so there are two possible phases from
// the divider states. This deterministically selects one.
hmc7043::sysref_rtio_align(sysref_phase_fpga);
hmc7043::sysref_rtio_align(sysref_phase_fpga, 1);
for dacno in 0..csr::AD9154.len() {
// We assume DCLK and SYSREF traces are matched on the PCB

17
artiq/firmware/libboard_artiq/hmc830_7043.rs
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@ -158,13 +158,13 @@ pub mod hmc7043 {
use board_misoc::{csr, clock};
// All frequencies assume 1.2GHz HMC830 output
const DAC_CLK_DIV: u32 = 2; // 600MHz
const FPGA_CLK_DIV: u32 = 8; // 150MHz
const SYSREF_DIV: u32 = 128; // 9.375MHz
const HMC_SYSREF_DIV: u32 = SYSREF_DIV*8; // 1.171875MHz (must be <= 4MHz)
pub const DAC_CLK_DIV: u16 = 2; // 600MHz
pub const FPGA_CLK_DIV: u16 = 8; // 150MHz
pub const SYSREF_DIV: u16 = 128; // 9.375MHz
pub const HMC_SYSREF_DIV: u16 = SYSREF_DIV*8; // 1.171875MHz (must be <= 4MHz)
// enabled, divider, output config
const OUTPUT_CONFIG: [(bool, u32, u8); 14] = [
const OUTPUT_CONFIG: [(bool, u16, u8); 14] = [
(true, DAC_CLK_DIV, 0x08), // 0: DAC2_CLK
(true, SYSREF_DIV, 0x08), // 1: DAC2_SYSREF
(true, DAC_CLK_DIV, 0x08), // 2: DAC1_CLK
@ -355,7 +355,7 @@ pub mod hmc7043 {
unsafe { csr::sysref_sampler::sample_result_read() == 1 }
}
pub fn sysref_rtio_align(phase_offset: u16) {
pub fn sysref_rtio_align(phase_offset: u16, expected_align: u16) {
info!("aligning SYSREF with RTIO...");
let mut slips0 = 0;
@ -380,7 +380,10 @@ pub mod hmc7043 {
break;
}
}
info!(" ...done ({}/{} slips), verifying timing margin", slips0, slips1);
info!(" ...done ({}/{} slips)", slips0, slips1);
if (slips0 + slips1) % expected_align != 0 {
error!(" unexpected slip alignment");
}
let mut margin_minus = None;
for d in 0..phase_offset {

5
artiq/firmware/satman/main.rs
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@ -298,7 +298,10 @@ pub extern fn main() -> i32 {
#[cfg(has_hmc830_7043)]
{
if drtio_tsc_loaded() {
hmc830_7043::hmc7043::sysref_rtio_align(SYSREF_PHASE_FPGA);
// Expected alignment: 1 RTIO clock period
hmc830_7043::hmc7043::sysref_rtio_align(
SYSREF_PHASE_FPGA,
hmc830_7043::hmc7043::FPGA_CLK_DIV);
}
}
}