It can be output during the download chain. In a download chain, when the first device is configured, this signal will start the next device to start configuration. The nCEO of the last device on the download chain is floating.
This is a reusable bai pin. You can use the software to change it to the user I/O pin when it is configured in a single setting, or you can change it to input tristate. The main purpose of this pin is The role is to make the nCE pin of the next device in multiple devices, and nCE is mainly used as the chip selection signal of the device, and the low level is effective.
I/O pin or output pin. When the configuration is completed, this pin will output a low level. In the configuration process of multiple devices, this pin will be connected to the nCE pin of the next device. At this time, it also needs to connect a 10K pull-up resistor to Vccio. During the configuration of multiple devices, the nCEO of the last device can be left floating. If you want to use this pin as an available I/O, you need to make settings in the software. In addition, even if doing I/O, you have to wait for the configuration to be completed.
Xilinx BGA676
CPLD CoolRunner -II Family 12K Gates 512 Macro Cells 179MHz 0.18um Technology 1.8V 208-Pin PQFP
FPGA XC4000X Family 28K Gates 2432 Cells 0.35um Technology 3.3V 240-Pin HSPQFP EP
This lends power savings to High-end Communication equipment and speed to battery operated devices.
This lends power savings to High-end Communication equipment and speed to battery operated devices.
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