Difference between revisions of "RETRO-EP4CE15"
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| Line 72: | Line 72: | ||
** 0.56V | ** 0.56V | ||
** 0.8V | ** 0.8V | ||
| + | |||
| + | === Voltage Steps === | ||
[[File:VGA_Sim_2R_Voltage.PNG]] | [[File:VGA_Sim_2R_Voltage.PNG]] | ||
| + | |||
| + | === Current Steps === | ||
[[File:VGA_Sim_2R_Current.PNG]] | [[File:VGA_Sim_2R_Current.PNG]] | ||
Revision as of 14:01, 1 February 2020
Contents
Features
- Purchased FPGA Card
- QMTECH EP4CE15 Board
- Altera Cyclone IV EP4CE15F23C8N FPGA
- Winbond W9825C6KH-6 4M X 4 Banks x 16 bits SDRAM
- 3 Switches
- DC power jack
- Power supply
- 1MB SRAM
- For banked use in CP/M
- 6 bit video on VGA
- PS/2 connector
- FTDI USB to serial converter
- Tx/Rx LEDs
- SD or SDHC Card
- 2x3 Header
Connectors
U7
U8
Headers/Jumpers
H1 - Power
- Power from USB 5V
H2 - I/O Power Source
- 1-2 = FPGA Power
- 2-3 = On-board Regulator
J2 - PS/2 Keyboard
J3 - Header
P2 - PS/2 Keyboard
P3 - USB-C
P4 - SD Card
Summing Resistor DAC
- 5% resistors are "good enough"
- Goal is 1V into 75 Ohm VGA load
- 3.3V drive
- FPGA has 8 mA drive
- Using 8 mA (max)
- R4 330 Ohm= 0.8 mA to -8.3 mA
- R3 680 Ohm = 0.8 mA to -4.4 mA
- Output in 4 steps
- 0V
- 0.27V
- 0.56V
- 0.8V
Voltage Steps
Current Steps
Schematic
Pin List
set_location_assignment PIN_T2 -to i_CLOCK_50 set_location_assignment PIN_W13 -to n_reset set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to n_reset set_location_assignment PIN_R1 -to ps2Clk set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to ps2Clk set_location_assignment PIN_R2 -to ps2Data set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to ps2Data set_location_assignment PIN_C22 -to serSelect set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to serSelect set_location_assignment PIN_A10 -to cts1 set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to cts1 set_location_assignment PIN_A13 -to rts1 set_location_assignment PIN_B10 -to rxd1 set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to rxd1 set_location_assignment PIN_B13 -to txd1 set_location_assignment PIN_B17 -to videoB0 set_location_assignment PIN_A17 -to videoB1 set_location_assignment PIN_B16 -to videoG0 set_location_assignment PIN_A16 -to videoG1 set_location_assignment PIN_B20 -to videoR0 set_location_assignment PIN_A15 -to videoR1 set_location_assignment PIN_B18 -to hSync set_location_assignment PIN_A18 -to vSync set_location_assignment PIN_F1 -to n_sRamCS set_location_assignment PIN_B4 -to n_sRamWE set_location_assignment PIN_J2 -to n_sRamOE set_location_assignment PIN_E1 -to sramData[0] set_location_assignment PIN_C1 -to sramData[1] set_location_assignment PIN_B1 -to sramData[2] set_location_assignment PIN_B3 -to sramData[3] set_location_assignment PIN_B2 -to sramData[4] set_location_assignment PIN_C2 -to sramData[5] set_location_assignment PIN_D2 -to sramData[6] set_location_assignment PIN_F2 -to sramData[7] set_location_assignment PIN_H1 -to sramAddress[0] set_location_assignment PIN_J1 -to sramAddress[1] set_location_assignment PIN_M1 -to sramAddress[2] set_location_assignment PIN_N1 -to sramAddress[3] set_location_assignment PIN_A8 -to sramAddress[15] set_location_assignment PIN_A7 -to sramAddress[14] set_location_assignment PIN_A6 -to sramAddress[13] set_location_assignment PIN_A5 -to sramAddress[12] set_location_assignment PIN_C3 -to sramAddress[11] set_location_assignment PIN_A4 -to sramAddress[10] set_location_assignment PIN_A3 -to sramAddress[9] set_location_assignment PIN_H2 -to sramAddress[8] set_location_assignment PIN_M2 -to sramAddress[7] set_location_assignment PIN_N2 -to sramAddress[6] set_location_assignment PIN_P2 -to sramAddress[5] set_location_assignment PIN_P1 -to sramAddress[4] set_location_assignment PIN_B5 -to sramAddress[18] set_location_assignment PIN_B6 -to sramAddress[17] set_location_assignment PIN_B7 -to sramAddress[16] # SDRAM set_location_assignment PIN_Y6 -to sdRamClk set_location_assignment PIN_W6 -to sdRamClkEn set_location_assignment PIN_AA4 -to n_sdRamCas set_location_assignment PIN_AA3 -to n_sdRamCe set_location_assignment PIN_AB3 -to n_sdRamRas set_location_assignment PIN_AB4 -to n_sdRamWe set_location_assignment PIN_V2 -to sdRamAddr[0] set_location_assignment PIN_V1 -to sdRamAddr[1] set_location_assignment PIN_U2 -to sdRamAddr[2] set_location_assignment PIN_U1 -to sdRamAddr[3] set_location_assignment PIN_V3 -to sdRamAddr[4] set_location_assignment PIN_V4 -to sdRamAddr[5] set_location_assignment PIN_Y2 -to sdRamAddr[6] set_location_assignment PIN_AA1 -to sdRamAddr[7] set_location_assignment PIN_Y3 -to sdRamAddr[8] set_location_assignment PIN_V5 -to sdRamAddr[9] set_location_assignment PIN_W1 -to sdRamAddr[10] set_location_assignment PIN_Y4 -to sdRamAddr[11] set_location_assignment PIN_V6 -to sdRamAddr[12] set_location_assignment PIN_Y1 -to sdRamAddr[13] set_location_assignment PIN_W2 -to sdRamAddr[14] set_location_assignment PIN_AA10 -to sdRamData[0] set_location_assignment PIN_AB9 -to sdRamData[1] set_location_assignment PIN_AA9 -to sdRamData[2] set_location_assignment PIN_AB8 -to sdRamData[3] set_location_assignment PIN_AA8 -to sdRamData[4] set_location_assignment PIN_AB7 -to sdRamData[5] set_location_assignment PIN_AA7 -to sdRamData[6] set_location_assignment PIN_AB5 -to sdRamData[7] set_location_assignment PIN_Y7 -to sdRamData[8] set_location_assignment PIN_W8 -to sdRamData[9] set_location_assignment PIN_Y8 -to sdRamData[10] set_location_assignment PIN_V9 -to sdRamData[11] set_location_assignment PIN_V10 -to sdRamData[12] set_location_assignment PIN_Y10 -to sdRamData[13] set_location_assignment PIN_W10 -to sdRamData[14] set_location_assignment PIN_V11 -to sdRamData[15] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to hSync set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to n_reset set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to ps2Clk set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to ps2Data set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to videoB0 set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to videoB1 set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to videoG0 set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to videoG1 set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to videoR0 set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to videoR1 set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to vSync set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to rts1 set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to rxd1 set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to txd1 set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to n_sRamCS set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to n_sRamOE set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to n_sRamWE set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramData[0] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramData[1] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramData[2] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramData[3] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramData[4] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramData[5] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramData[6] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramData[7] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[0] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[1] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[2] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[3] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[4] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[5] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[6] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[7] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[8] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[15] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[14] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[13] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[10] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[9] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[11] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[12] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[16] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[17] set_instance_assignment -name IO_STANDARD "3.3-V LVTTL" -to sramAddress[18]
