Differences
This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision | ||
boards:sbc:tiny68k:tiny68k_rev2 [2017/12/15 23:25] plasmo |
boards:sbc:tiny68k:tiny68k_rev2 [2017/12/21 11:43] (current) plasmo |
||
---|---|---|---|
Line 1: | Line 1: | ||
====== Tiny68K, 68000 SBC, Rev 2 ====== | ====== Tiny68K, 68000 SBC, Rev 2 ====== | ||
+ | |||
+ | This page only contains updated information specific to rev 2 pc board. For general description of Tiny68K, please refer to [[: | ||
===== Introduction ===== | ===== Introduction ===== | ||
- | Tiny68K is a high-performance yet low-cost single board computer based on the Motorola 68000. Tiny68K has two unusual features: | + | Tiny68K is a high-performance yet low-cost single board computer based on the Motorola 68000. |
+ | |||
+ | * The Compact Flash interface of rev 1 is marginal. It may not work with faster CF drives due to ground noises generated by faster CF drives. Rev 2 design added isolation resistors to the data line, RC circuitry to the nIORD control line, and pull up resistors to the upper half of the 16-bit data line | ||
+ | * A 'warm boot' button is added that will generate a non-maskable interrupt to the 68000 when pressed. | ||
+ | * Add a real-time clock based on DS1302 that is backed up with a super capacitor. | ||
+ | |||
+ | Figure below shows an assembled rev 2 Tiny68K with annotations showing the changes from rev1 design. | ||
+ | |||
+ | [[https:// | ||
+ | |||
+ | ===== Rev 2 Design Files ===== | ||
+ | |||
+ | {{: | ||
+ | |||
+ | gerber {{: | ||
+ | |||
+ | Part list | ||
+ | |||
+ | Altera EPM7128 {{: | ||
- | * The entire 16-megabyte memory space of 68000 (except the top 32Kbyte of I/O space) is filled with RAM, | + | Tiny68K {{: |
- | * The boot software | + | |
- | Figure below shows an assembled Tiny68K. | + | ===== Board build procedures ===== |