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boards:sbc:tiny68k:tiny68k_rev2 [2017/12/15 23:34]
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boards:sbc:tiny68k:tiny68k_rev2 [2017/12/21 11:43] (current)
plasmo |
| ====== Tiny68K, 68000 SBC, Rev 2 ====== | ====== Tiny68K, 68000 SBC, Rev 2 ====== |
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| | This page only contains updated information specific to rev 2 pc board. For general description of Tiny68K, please refer to [[:boards:sbc:tiny68k|this page]]. |
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| ===== Introduction ===== | ===== Introduction ===== |
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| Tiny68K is a high-performance yet low-cost single board computer based on the Motorola 68000. Revision 2 of Tiny68K has the following changes: | Tiny68K is a high-performance yet low-cost single board computer based on the Motorola 68000. Revision 2 of Tiny68K has the following changes: |
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| * The Compact Flash interface of rev 1 is marginal. It does not work with faster CF drive due to ground noise generated by faster CF drives. Rev 2 design added isolation resistors to the data line, RC circuitry to the IORD control line, and pull up resistors to the upper half of the 16-bit data line | * 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. | * 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. | * Add a real-time clock based on DS1302 that is backed up with a super capacitor. |
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| Figure below shows an assembled Tiny68K. | Figure below shows an assembled rev 2 Tiny68K with annotations showing the changes from rev1 design. |
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| | [[https://www.retrobrewcomputers.org/lib/exe/fetch.php?tok=de4d25&media=https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/boards/sbc/tiny68k/tiny68k_rev2/tiny68k-rev2_changes_copy.jpg|{{https://www.retrobrewcomputers.org/lib/plugins/ckgedit/fckeditor/userfiles/image/boards/sbc/tiny68k/tiny68k_rev2/tiny68k-rev2_changes_copy.jpg?direct&600x371|www.retrobrewcomputers.org_lib_plugins_ckgedit_fckeditor_userfiles_image_boards_sbc_tiny68k_tiny68k_rev2_tiny68k-rev2_changes_copy.jpg}}]] |
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| | ===== Rev 2 Design Files ===== |
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| | {{:boards:sbc:tiny68k:tiny68k_rev2:tiny68k_scm_rev2.pdf|schematic, }} the schematic and board layout tools are IVEX's WinBoard and WinDraft (ver 2.05) |
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| | gerber {{:boards:sbc:tiny68k:tiny68k_rev2:tiny68k_r2.zip|photo plots}}, pc boards were manufactured by SeeedStudio |
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| | Part list |
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| | Altera EPM7128 {{:boards:sbc:tiny68k:tiny68k_rev2:rtc_en_0_wait.zip|design files}}. Designs are created in Quartus 8.1, should be compatible with later version of Quartus. Designs are entirely in schematics. {{:boards:sbc:tiny68k:tiny68k_rev2:tiny68k_cpld_rtc_en_0_wait.pdf|Schematic}} in PDF format. {{:boards:sbc:tiny68k:tiny68k_rev2:tiny68k_cpld_program_binary.zip|Programming binary}} in .pof format. |
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| | Tiny68K {{:boards:sbc:tiny68k:tiny68k_rev2:t68kbug_r07.zip|Monitor debugger}}. The software is developed in the EASy68K tool chain. File with .bin extension is the programming binary for serial EEPROM programmer (CH341). |
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| | ===== Board build procedures ===== |
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