Arrow DECA User Manual page 122

flash memory (CFM). The CFM will be part of the programmer object file (.pof) programmed into
the internal flash through the JTAG In-System Programming (ISP).
During internal configuration, MAX 10 devices load the configuration RAM (CRAM) with
configuration data from the CFM. Both of the application configuration images, image 0 and image
1, are stored in the CFM. The MAX 10 device loads either one of the application configuration
image from the CFM. If an error occurs, the device will automatically load the other application
configuration image. Remote System Upgrade Flow for MAX 10 Devices as shown in
Figure 8-2 Remote System Upgrade Flow for MAX 10 Devices
The operation of the remote system upgrade feature detecting errors is as follows:
1. After power-up, the device samples the BOOT_SEL pin to determine which application
configuration image to boot. The BOOT_SEL pin setting can be overwritten by the input register of
the remote system upgrade circuitry for the subsequent reconfiguration.
2. If an error occurs, the remote system upgrade feature reverts by loading the other application
configuration image. The following lists the errors that will cause the remote system upgrade
feature to load another application configuration image:
 Internal CRC error
 User watchdog timer time-out
3. Once the revert configuration completes and the device is in the user mode, you can use the
remote system upgrade circuitry to query the cause of error and which application image failed.
4. If a second error occurs, the device waits for a reconfiguration source. If the auto-reconfig is
enabled, the device will reconfigure without waiting for any reconfiguration source.
5. Reconfiguration is triggered by the following actions:
 Driving the nSTATUS low externally
 Asserting internal or external nCONFIG low
 Asserting RU_nCONFIG low
DECA User Manual
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Figure 8-2 .
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May 22, 2015