Note:
nSTATUS
does not go low for PR failures or failures using the JTAG configuration scheme.
Generally, the Intel Agilex device changes the value of
nSTATUS
to follow the value of
nCONFIG
, except after an error. For
example, after POR,
nSTATUS
asserts after
nCONFIG
asserts. When the host drives
nCONFIG
high, the Intel Agilex device
drives
nSTATUS
high.
In previous device families the deassertion of
nSTATUS
indicates the device is ready for configuration. For Intel Agilex
devices, when using Avalon-ST configuration scheme, after the Intel Agilex device drives
nSTATUS
high, you must also
monitor the
AVST_READY
signal to determine when the device is ready to accept configuration data.
nSTATUS
asserts if an error occurs during configuration. The pulse ranges from 0.5 ms to 10 ms.
nSTATUS
assertion is asynchronous to data error detection. Intel Agilex devices do not support the auto-restart
configuration after error option.
Previous device families implement the
nSTATUS
as an open drain with a weak internal pull-up. Intel Agilex always drives
nSTATUS
. Consequently, you cannot wire OR an Intel Agilex
nSTATUS
signal with the
nSTATUS
signal from earlier device
families.
Debugging Suggestions
Ensure
nSTATUS
acknowledges
nCONFIG
. If
nSTATUS
is not following
nCONFIG
, the FPGA may not have exited POR. You may
need to power cycle the PCB.
6.7.3. CONF_DONE and INIT_DONE
For Intel Agilex devices, both
CONF_DONE
and
INIT_DONE
share multiplexed
SDM_IO
pins. Previous device families
implement the
CONF_DONE
and
INIT_DONE
pins as open drains with a weak internal pull-up. Consequently, you cannot wire
OR an Intel Agilex
CONF_DONE
or
INIT_DONE
signal with the
nSTATUS
signal from previous device families. Otherwise,
CONF_DONE
and
INIT_DONE
behave as these signals behaved in earlier device families. If you assign
CONF_DONE
and
INIT_DONE
to
SDM_IO16
and
SDM_IO0
, weak internal pull-downs pull these pins low at power-on reset. Ensure you specify
these pins in the Intel Quartus Prime Software or in the Intel Quartus Prime settings file, (
.qsf
).
CONF_DONE
and
INIT_DONE
are low prior to and during configuration.
CONF_DONE
asserts when the device finishes receiving configuration
data.
INIT_DONE
asserts when the device enters user mode.
Note:
The entire device does not enter user mode simultaneously.Intel recommends that you include the
on page 23 to hold your application logic in the reset state until the entire FPGA fabric is in user mode.
6. Intel Agilex Debugging Guide
UG-20205 | 2019.10.09
Intel
®
Agilex
™
Configuration User Guide
189