[486c329] | 1 | # |
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| 2 | # $Id$ |
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| 3 | # |
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| 4 | |
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| 5 | Description: efi68k |
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| 6 | ============ |
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| 7 | CPU: MC68HC000 @16MHz |
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| 8 | RAM: 256k |
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| 9 | ROM: 256k |
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| 10 | |
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| 11 | Based upon a 16MHz 68HC000, efi332 is a minimally configured 4x6 |
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| 12 | inch single board computer. It includes the following major |
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| 13 | components: (a) 256k SRAM (km681000l), (b) 256 EPROM (27C010), |
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| 14 | (c) DP8570A (clock/timer/calendar), (d) MAX791 (cpu supervisory chip |
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| 15 | with battery backup switch-over and watch dog timer), and |
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| 16 | (e) NS16550DN (UART). The following interrupt functions have also been |
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| 17 | incorporated: UART, TIMER, Watch Dog, and Low Line voltage (trips at |
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| 18 | 4.85V; enough time to save the cpu reg before reset is asserted on |
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| 19 | power down). |
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| 20 | The schematic for efi68k is freely available via e-mail. Send |
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| 21 | "index diy_efi" to majordomo@coulomb.eng.ohio-state.edu. Retrieve the |
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| 22 | files related to 68hc000-1.00 with the "get diy_efi <filename>" |
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| 23 | command. efi68k does not have an available printed circuit board, but |
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| 24 | can be wire-wrapped in about four days. Cost is about $100US. |
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| 25 | |
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| 26 | TODO: |
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| 27 | ===== |
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| 28 | - add the "tm27 vector" ... can we use a trap instruction? |
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[6335022e] | 29 | - generate include/coverhd.c to perform the tmtest. |
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[486c329] | 30 | - the interrupt drive I/O should be integrated into the RTEMS. |
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| 31 | - finish the ROM memory model. |
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[6335022e] | 32 | - add separate interrupt stack (low priority). |
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[486c329] | 33 | |
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| 34 | John S Gwynne |
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| 35 | Gwynne.1@osu.edu |
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| 36 | _______________________________________________________________________________ |
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| 37 | T h e O h i o - S t a t e U n i v e r s i t y |
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| 38 | ElectroScience Laboratory, 1320 Kinnear Road, Columbus, Ohio 43212, USA |
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| 39 | Telephone: (614) 292-7981 * Fax: (614) 292-7297 |
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| 40 | ------------------------------------------------------------------------------- |
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| 41 | |
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