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cora ddr attempts

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This commit is contained in:
Astro 2020-03-25 13:02:55 +01:00
parent ea765fc529
commit ed52ead914
1 changed files with 39 additions and 21 deletions
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60
libboard_zynq/src/ddr/mod.rs
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@ -61,7 +61,7 @@ impl DdrRam {
fn calibrate_iob_impedance(clocks: &Clocks) { fn calibrate_iob_impedance(clocks: &Clocks) {
let divisor0 = ((DCI_FREQ - 1 + clocks.ddr) / DCI_FREQ) let divisor0 = ((DCI_FREQ - 1 + clocks.ddr) / DCI_FREQ)
.max(1).min(63) as u8; .max(1).min(63) as u8;
let divisor1 = (clocks.ddr / DCI_FREQ / u32::from(divisor0)) let divisor1 = ((DCI_FREQ - 1 + clocks.ddr) / DCI_FREQ / u32::from(divisor0))
.max(1).min(63) as u8; .max(1).min(63) as u8;
println!("DDR DCI clock: {} Hz", clocks.ddr / u32::from(divisor0) / u32::from(divisor1)); println!("DDR DCI clock: {} Hz", clocks.ddr / u32::from(divisor0) / u32::from(divisor1));
@ -111,21 +111,46 @@ impl DdrRam {
slcr.ddriob_addr0.write(addr_config.clone()); slcr.ddriob_addr0.write(addr_config.clone());
slcr.ddriob_addr1.write(addr_config); slcr.ddriob_addr1.write(addr_config);
let data_config = slcr::DdriobConfig::zeroed() #[cfg(feature = "target_zc706")]
let data0_config = slcr::DdriobConfig::zeroed()
.inp_type(slcr::DdriobInputType::VrefDifferential) .inp_type(slcr::DdriobInputType::VrefDifferential)
.term_en(true) .term_en(true)
.dci_type(slcr::DdriobDciType::Termination) .dci_type(slcr::DdriobDciType::Termination)
.output_en(slcr::DdriobOutputEn::Obuf); .output_en(slcr::DdriobOutputEn::Obuf);
slcr.ddriob_data0.write(data_config.clone()); #[cfg(feature = "target_zc706")]
slcr.ddriob_data1.write(data_config); let data1_config = data0_config.clone();
#[cfg(feature = "target_cora_z7_10")]
let data0_config = slcr::DdriobConfig::zeroed()
.inp_type(slcr::DdriobInputType::VrefDifferential)
.term_en(true)
.dci_type(slcr::DdriobDciType::Termination)
.output_en(slcr::DdriobOutputEn::Obuf);
#[cfg(feature = "target_cora_z7_10")]
let data1_config = slcr::DdriobConfig::zeroed()
.pullup_en(true);
slcr.ddriob_data0.write(data0_config);
slcr.ddriob_data1.write(data1_config);
let diff_config = slcr::DdriobConfig::zeroed() #[cfg(feature = "target_zc706")]
let diff0_config = slcr::DdriobConfig::zeroed()
.inp_type(slcr::DdriobInputType::Differential) .inp_type(slcr::DdriobInputType::Differential)
.term_en(true) .term_en(true)
.dci_type(slcr::DdriobDciType::Termination) .dci_type(slcr::DdriobDciType::Termination)
.output_en(slcr::DdriobOutputEn::Obuf); .output_en(slcr::DdriobOutputEn::Obuf);
slcr.ddriob_diff0.write(diff_config.clone()); #[cfg(feature = "target_zc706")]
slcr.ddriob_diff1.write(diff_config); let diff1_config = diff0_config.clone();
#[cfg(feature = "target_cora_z7_10")]
let diff0_config = slcr::DdriobConfig::zeroed()
.inp_type(slcr::DdriobInputType::Differential)
.term_en(true)
.dci_type(slcr::DdriobDciType::Termination)
.output_en(slcr::DdriobOutputEn::Obuf);
#[cfg(feature = "target_cora_z7_10")]
let diff1_config = slcr::DdriobConfig::zeroed()
.pullup_en(true);
slcr.ddriob_diff0.write(diff0_config);
slcr.ddriob_diff1.write(diff1_config);
slcr.ddriob_clock.write( slcr.ddriob_clock.write(
slcr::DdriobConfig::zeroed() slcr::DdriobConfig::zeroed()
@ -140,24 +165,17 @@ impl DdrRam {
slcr.ddriob_drive_slew_clock.write(0x00F9861C); slcr.ddriob_drive_slew_clock.write(0x00F9861C);
} }
#[cfg(feature = "target_zc706")]
let vref_sel = slcr::DdriobVrefSel::Vref0_75V;
#[cfg(feature = "target_cora_z7_10")]
let vref_sel = slcr::DdriobVrefSel::Vref0_675V;
// // Enable internal V[REF]
// slcr.ddriob_ddr_ctrl.modify(|_, w| w
// .vref_ext_en_lower(false)
// .vref_ext_en_upper(false)
// .vref_sel(vref_sel)
// .vref_int_en(true)
// );
// Enable external V[REF] // Enable external V[REF]
#[cfg(feature = "target_cora_z7_10")]
slcr.ddriob_ddr_ctrl.modify(|_, w| w
.vref_int_en(false)
.vref_ext_en_lower(true)
.vref_ext_en_upper(false)
);
#[cfg(feature = "target_zc706")]
slcr.ddriob_ddr_ctrl.modify(|_, w| w slcr.ddriob_ddr_ctrl.modify(|_, w| w
.vref_ext_en_lower(true) .vref_ext_en_lower(true)
.vref_ext_en_upper(true) .vref_ext_en_upper(true)
.vref_sel(vref_sel)
.vref_int_en(false)
); );
}); });
} }