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zik80
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zik80 [2015/11/09 19:27] skeezix |
zik80 [2017/11/11 02:58] (current) |
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| | CPU | Zilog eZ80 | @green:Yes!| Specifically: EZ80F93AZ020SG | | | CPU | Zilog eZ80 | @green:Yes!| Specifically: EZ80F93AZ020SG | | ||
| | RAM | 128KB main RAM (easily changed in design); theres also 4KB SRAM built into the CPU, but thats a little cheating; maybe use it for stack, nice and fast. | @green:Yes! | The eZ80 can actually manage up to 16MB of RAM, but current target is for kit to default to 128KB; fairly trivial to solder in larger pieces if you need .. headers should be exposed | | | RAM | 128KB main RAM (easily changed in design); theres also 4KB SRAM built into the CPU, but thats a little cheating; maybe use it for stack, nice and fast. | @green:Yes! | The eZ80 can actually manage up to 16MB of RAM, but current target is for kit to default to 128KB; fairly trivial to solder in larger pieces if you need .. headers should be exposed | | ||
| + | | RAM | 512KB | @green: Yes! | r3 and later pcb can support the higher RAM sizes; added up to 512KB in case I want to run an ancient Linux, or various other operating systems.. | | ||
| | CPU Speed | 20MHz (or less) | @green:Yes!| Driven by a crystal .. use any speed you like up to 20MHz; it is also possible to drive the clock from the GPU (say), to make the speed variable; in practice, thats sort of goofy and confusing, so not in the earliest revision.. but maybe do later. For fun.| | | CPU Speed | 20MHz (or less) | @green:Yes!| Driven by a crystal .. use any speed you like up to 20MHz; it is also possible to drive the clock from the GPU (say), to make the speed variable; in practice, thats sort of goofy and confusing, so not in the earliest revision.. but maybe do later. For fun.| | ||
| | CPU Peripherals | I²C, UART/USART serial, GPIO| @green:Yes!| These are in the breakout headers, if you like| | | CPU Peripherals | I²C, UART/USART serial, GPIO| @green:Yes!| These are in the breakout headers, if you like| | ||
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