The idea of the DEXT meteor is to create an easy to use, uncomplicated single board computer with the most processing power for it's cost.
So lets compare CPU specs:
SPEC | Z8S180 | FPGA |
Speed: | up to 33 Mhz | 50+MHz |
Max RAM: | 1 MiB | about 16 MiB |
CPU bits | 8 | up to 32 |
RAM type | DDR | SRAM |
Voltage: | 5v | 3.3v |
Estimated cost: | about 50 USD | about 65 USD |
The FPGA design is about 15$ more than a Z8S180 design. The processing power difference is HUGE though. Not only can an FPGA allow for a faster and bigger processor, it can handle all the glue logic and many peripherals. Also, the FPGA can have a bigger address bus, so it can be upgraded further.
These price estimates assume the following about the produced SBC:
- Installed RAM is 1 MiB
- comes with dedicated audio, video, 28 GPIO pins, and WiFi support
- Computer has a BIOS or bootloader of some kind in ROM, at least 2KiB
- Doesn't include mass storage options.
We decided to go with the FPGA because the greater processing power is awesome.
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