Editing Minimig FPGA
Jump to navigation
Jump to search
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.
The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
Latest revision | Your text | ||
Line 22: | Line 22: | ||
Use as a south bridge, a CPLD like:<br> | Use as a south bridge, a CPLD like:<br> | ||
{| class="wikitable" | {| class="wikitable" | ||
− | ! Brand!! Chip!! Macrocells!! IOs!! Price!! | + | ! Brand!! Chip!! Macrocells!! IOs!! Price!! Linux support |
|- | |- | ||
| Altera|| MAX 3000 EPM3128ATC100-10|| 128 || 80 || $8.60||No | | Altera|| MAX 3000 EPM3128ATC100-10|| 128 || 80 || $8.60||No | ||
Line 33: | Line 33: | ||
<br> | <br> | ||
The slow IOs from Paula and the 8520s can be moved to the CPLD.<br> | The slow IOs from Paula and the 8520s can be moved to the CPLD.<br> | ||
− | On a real ECS/OCS Amiga, IOs from the 8520s are updated at 700 | + | On a real ECS/OCS Amiga, IOs from the 8520s are updated at 700 KHz, IOs from Paula/Denise are updated at 3.5 MHz.<br> |
On a real AGA Amiga, the 8520s are slightly faster : the IOs are updated at 1.4 MHz.<br> | On a real AGA Amiga, the 8520s are slightly faster : the IOs are updated at 1.4 MHz.<br> | ||
If we run a high speed bus at 28 MHz between the FPGA and the CPLD, each wire can "transport" 8 IOs from paula or 20 IOs from a 8520.<br> | If we run a high speed bus at 28 MHz between the FPGA and the CPLD, each wire can "transport" 8 IOs from paula or 20 IOs from a 8520.<br> | ||
Line 40: | Line 40: | ||
There is an application note from Altera describing how to use a MAX as an IO expander :<br> | There is an application note from Altera describing how to use a MAX as an IO expander :<br> | ||
[http://www.altera.com/literature/an/an265.pdf AN 265: Using MAX II & MAX 3000A Devices as a Microcontroller I/O Expander] | [http://www.altera.com/literature/an/an265.pdf AN 265: Using MAX II & MAX 3000A Devices as a Microcontroller I/O Expander] | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− |