Intel Agilex Series

The nCONFIG pin transition from low to high signals a configuration or reconfiguration request. The nSTATUS pin indicates
device readiness to initiate FPGA configuration.
The configuration source can only change the state of the nCONFIG pin when it has the same value as nSTATUS. When the
Intel Agilex device is ready it drives nSTATUS to follow nCONFIG.
The host should drive nCONFIG low to initiate device cleaning. Then the host should drive nCONFIG high to initiate
configuration. If the host drives nCONFIG low during a configuration cycle, that configuration cycle stops. The SDM expects a
new configuration cycle to begin.
2.5.3.1.2. nSTATUS
nSTATUS has the following two functions:
•
To behave as an acknowledge for nCONFIG.
•
To behave as an error status signal. It is important to monitor nSTATUS to identify configuration failures.
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.
nSTATUS must be pulled high externally and the SDM must sample nSTATUS high when V
CCIO_SDM
ramps up to the
recommended operating voltage.
2. Intel Agilex Configuration Details
683673 | 2021.10.29
Send Feedback
Intel
®
Agilex
™
Configuration User Guide
37