KIC551
K I C 5 5 1 U s e r M a n u a l
29
© 2 0 2 1 F a s t w e l V e r . 0 0 3
Fig. 2.3
– Diargam for multiplexing configuration EEPROM of KIC551/KIC551RC
The board of the KIC551 / KIC551RC module is also equipped with hardware multiplexers
(SN74CBTLV3257), which arrange switching of interfaces (SPI or Microware) of the corresponding
configuration EEPROMs between the FPGA and the configured devices themselves. These
multiplexers are controlled by hardware and software: if the FPGA is successfully configured, then
the multiplexers will be controlled by the FPGA, otherwise, the configuration EEPROMs will be
permanently connected to their configurable devices.
Forwarding interfaces from the configuration EEPROMs to microcontroller enables to modify
contents of any of the EEPROMs (including the configuration EEPROMs FPGA) both locally from
the NAND flash drive and remotely via the Gigabit Ethernet interface (the MCU operates at the rate
of up to 100 Mb).
■
Hardware watchdog timer for loading FPGA from the reserve EEPROM
The hardware watchdog timer is designed for switching active configuration EEPROM FPGA from
the main to the reserve one in case of damages to PCU FPGA in the main configuration EEPROM
FPGA.
