
Notes for Figure:
1. Refer to MSEL Settings for the correct resistor pull-up and pull-down values for all configuration schemes.
2. The
MSEL
pins are dual-purpose. After power-on, you can reassign these pins to other functions. For more information,
refer to Enabling Dual Purpose Pins
3. The synchronizers shown in all three figures can be internal if the host is an FPGA or CPLD. If the host is a microprocessor,
you must use discrete synchronizers.
Related Information
MSEL Settings
on page 27
3.1.6. Debugging Guidelines for the Avalon-ST Configuration Scheme
The Avalon-ST configuration scheme replaces the previously available in fast passive parallel (FPP) modes. This configuration
scheme retains similar functionality and performance. Here are the important differences:
•
The Avalon-ST configuration scheme requires you to monitor the flow control signal,
AVST_READY
. The
AVST_READY
signal indicates if the device can receive configuration data.
•
The
AVST_CLK
and
AVSTx8_CLK
clock signals cannot pause when configuration data is not being transferred. Data is not
transferred when
AVST_READY
and
AVST_VALID
are low. The
AVST_CLK
and
AVSTx8_CLK
clock signals must run
continuously until
CONF_DONE
asserts.
Debugging Suggestions
Review the general Configuration Debugging Checklist in the Debugging Guide chapter before considering these debugging
tips that pertain to the Avalon-ST configuration scheme.
•
Only assert
AVST_VALID
after the SDM asserts
AVST_READY
.
•
Only assert
AVST_VALID
when the
AVST_DATA
is valid.
•
Ensure that the
AVST_CLK
clock signal is continuous and free running until configuration completes. The
AVST_CLK
can
stop after
CONF_DONE
asserts. The initialization state does not require the
AVST_CLK
signal.
•
If using x8 mode, ensure that you use the dedicated
SDM_IO
pins for this interface (clock, data, valid and ready).
•
If using x16 or x32 mode, power the I/O bank containing the x16 or x32 pins (I/O Bank 3A) at 1.8 V.
3. Intel Agilex Configuration Schemes
UG-20205 | 2019.10.09
Intel
®
Agilex
™
Configuration User Guide
52
Содержание Agilex
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