Difference between revisions of "EP2C5-DB"
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== VGA - Ideal Drive 2:2:2 Case == | == VGA - Ideal Drive 2:2:2 Case == | ||
| − | * | + | * FPGA has a 3.3V driver which can drive 8 mA |
* Ideal case drive current | * Ideal case drive current | ||
** 0.7V into 75 Ohms = 9.33 mA | ** 0.7V into 75 Ohms = 9.33 mA | ||
Revision as of 13:50, 23 February 2020
Contents
EP2C5-DB FPGA card
I love Grant Searle's Multicomp project. It lets you create 6502, Z80, 6809 Retrocomputers of the late 1970s era. This card provides all of the connections needed.
Grant's original design used an EP2 and that's exactly what this cards it. Note that's not compatible with the latest version Altera/Intel Quartus but you can download older versions like 13.1 SP. Just make sure it supports the Cyclone II family of FPGAs. We also have an EP4 version of this card for sale here on Tindie.
Features
- 6 bit video on VGA
- PS/2 connector
- 128KB of SRAM for banked use in CP/M
- Mount for inexpensive FTDI USB to serial converter
- SD Card
- DC power jack
EP2 Resources
VGA - Ideal Drive 2:2:2 Case
- FPGA has a 3.3V driver which can drive 8 mA
- Ideal case drive current
- 0.7V into 75 Ohms = 9.33 mA
- R-2R values
- Ideal resistor values are 417.9 ohms and 835.7 ohms
- Standard value 1% resistors
- 1% standard values are 422 (Mouser), 845 (Mouser) Ohms
- Get closest values
- 0V, 0.228V, 0.460V, 0.693V
- Voltage steps are:
- Current steps are:
Schematics
Multicomp Builds
Pin List
set_location_assignment PIN_101 -to rxd1 set_location_assignment PIN_103 -to txd1 set_location_assignment PIN_104 -to rts1 set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to rxd1 set_location_assignment PIN_17 -to clk set_location_assignment PIN_144 -to n_reset set_location_assignment PIN_4 -to n_sRamWE set_location_assignment PIN_126 -to n_sRamCS set_location_assignment PIN_134 -to n_sRamOE set_location_assignment PIN_8 -to sramAddress[15] set_location_assignment PIN_30 -to sramAddress[14] set_location_assignment PIN_24 -to sramAddress[13] set_location_assignment PIN_28 -to sramAddress[12] set_location_assignment PIN_136 -to sramAddress[11] set_location_assignment PIN_132 -to sramAddress[10] set_location_assignment PIN_139 -to sramAddress[9] set_location_assignment PIN_142 -to sramAddress[8] set_location_assignment PIN_143 -to sramAddress[7] set_location_assignment PIN_141 -to sramAddress[6] set_location_assignment PIN_137 -to sramAddress[5] set_location_assignment PIN_133 -to sramAddress[3] set_location_assignment PIN_135 -to sramAddress[4] set_location_assignment PIN_129 -to sramAddress[2] set_location_assignment PIN_125 -to sramAddress[1] set_location_assignment PIN_121 -to sramAddress[0] set_location_assignment PIN_122 -to sramData[7] set_location_assignment PIN_120 -to sramData[6] set_location_assignment PIN_118 -to sramData[5] set_location_assignment PIN_114 -to sramData[4] set_location_assignment PIN_112 -to sramData[3] set_location_assignment PIN_113 -to sramData[2] set_location_assignment PIN_115 -to sramData[1] set_location_assignment PIN_119 -to sramData[0] set_location_assignment PIN_75 -to video set_location_assignment PIN_74 -to videoSync set_location_assignment PIN_87 -to ps2Data set_location_assignment PIN_86 -to ps2Clk set_location_assignment PIN_64 -to videoB0 set_location_assignment PIN_63 -to videoB1 set_location_assignment PIN_67 -to videoG0 set_location_assignment PIN_65 -to videoG1 set_location_assignment PIN_70 -to videoR0 set_location_assignment PIN_69 -to videoR1 set_location_assignment PIN_71 -to hSync set_location_assignment PIN_72 -to vSync set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to n_reset set_location_assignment PIN_25 -to J6_3 set_location_assignment PIN_31 -to J6_4 set_location_assignment PIN_41 -to J6_5 set_location_assignment PIN_40 -to J6_6 set_location_assignment PIN_43 -to J6_7 set_location_assignment PIN_42 -to J6_8 set_location_assignment PIN_45 -to J6_9 set_location_assignment PIN_44 -to J6_10 set_location_assignment PIN_32 -to sramAddress[16]
