Difference between revisions of "Minimig Board v1.0 schematic"

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Board schematic for Minimig board v1.0
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Board schematic for Minimig board v1.0:
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[[Image:Minimig_v10_board_audio.png|thumb|right|250px|Audio output]]
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[[Image:Minimig_v10_board_audio.png|thumb|right|250px|J1 - Audio output via 3,5mm jack]]
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Voltage level: (3.3V/(560ohm + 560ohm + 32ohm))*32 ohm*1000 = 91,7mV<br>
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[[Image:Minimig_v10_board_dac.png|thumb|right|250px|J4 - 4 bit resistor ladder D/A]]
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[[Back EMF]] issues?
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In 15kHz mode:
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:/VSYNC = high (scart RGB enable)
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:/HSYNC = composite sync
  
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[[Image:Minimig_v10_board_dac.png|thumb|right|250px|4 bit resistor ladder D/A]]
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[[Image:Minimig_v10_board_fpga.png|thumb|right|250px|IC5 - [[FPGA]] Xilinx XC3S400-4PQ208C]]
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Notice the resistor of 560 ohm. May cause inlinear output.<br>
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[[Image:Minimig_v10_board_fpga_core_pwr.png|thumb|right|250px|IC3/IC4 - FPGA core power +1,25V +2,5V using [http://www.national.com/pf/LM/LM1117.html LM1117MP-ADJ] ]]
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[[Image:Minimig_v10_board_fpga.png|thumb|right|250px|FPGA Xilinx XC3S400-4PQ208C]]
 
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[[Image:Minimig_v10_board_fpga_core_pwr.png|thumb|right|250px|FPGA core power +1,25V +2,5V using [http://www.national.com/pf/LM/LM1117.html LM1117MP-ADJ]]]
 
 
[[Image:Minimig_v10_board_fpga_decoupling.png|thumb|right|250px|FPGA [[decoupling]]]]
 
[[Image:Minimig_v10_board_fpga_decoupling.png|thumb|right|250px|FPGA [[decoupling]]]]
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[[Image:Minimig_v10_board_joy0.png|thumb|right|250px|Joystick 0]]
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[[Image:Minimig_v10_board_joy0.png|thumb|right|250px|J10 - Joystick 0]]
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[[Image:Minimig_v10_board_joy1.png|thumb|right|250px|Joystick 1]]
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[[Image:Minimig_v10_board_joy1.png|thumb|right|250px|J6 - Joystick 1]]
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[[Image:Minimig_v10_board_jtag.png|thumb|right||[[Jtag]]]]
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[[Image:Minimig_v10_board_jtag.png|thumb|right||J7 - [[Jtag]] ]]
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[[Image:Minimig_v10_board_jumpers.png|thumb|right|250px|Jumper]]
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[[Image:Minimig_v10_board_jumpers.png|thumb|right|250px|Program & Menu button, 31/15kHz selection, Power & Disc led]]
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[[Image:Minimig_v10_board_kbd_mouse.png|thumb|right|250px|[[Keyboard]] & [[Mouse]] connections]]
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[[Image:Minimig_v10_board_kbd_mouse.png|thumb|right|250px|J5/J8 - [[Keyboard]] & [[Mouse]] connections]]
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[[Image:Minimig_v10_board_m68k.png|thumb|right|250px|MC68000]]
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[[Image:Minimig_v10_board_m68k.png|thumb|right|250px|IC9 - MC68000]]
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[[Image:Minimig_v10_board_m68k_decoupling.png|thumb|right|250px|MC68000 [[Decoupling]]]]
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[[Image:Minimig_v10_board_m68k_decoupling.png|thumb|right||MC68000 [[Decoupling]] ]]
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[[Image:Minimig_v10_board_mclk_generator.png|thumb|right|250px|Generation of 4.433619 MHz [[PAL]] Video MCLK using [http://www.it.lth.se/datablad/Logik/74HC/74HC4060.pdf 74HC4060] (Ntsc=3.579545MHz)]]
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[[Image:Minimig_v10_board_mclk_generator.png|thumb|right|250px|IC8 - Generation of 4.433619 MHz [[PAL]] video MCLK using [http://www.it.lth.se/datablad/Logik/74HC/74HC4060.pdf 74HC4060] (NTSC=3.579545MHz)]]
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PATCH needed to get rev 1 board working:<br>
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PATCH needed to get rev 1 board working:
 
:Disconnect net SPI_DOUT from pin 81 of FPGA.
 
:Disconnect net SPI_DOUT from pin 81 of FPGA.
 
:Connect net SPI_DOUT to pin 19 of FPGA (net USER3).
 
:Connect net SPI_DOUT to pin 19 of FPGA (net USER3).
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:
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:REASON: Pin 81 is an output during FPGA config that blocks SPI to MMC during startup.
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;REASON:
 
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:Pin 81 is an output during FPGA config that blocks SPI to MMC during startup.
 
  
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[[Image:Minimig_v10_board_pic18.png|thumb|right|250px|[[MCU]] [http://ww1.microchip.com/downloads/en/devicedoc/39564b.pdf PIC18LF252I/SP]]]
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[[Image:Minimig_v10_board_pic18.png|thumb|right|250px|IC10 - [[MCU]] [http://ww1.microchip.com/downloads/en/devicedoc/39564b.pdf PIC18LF252I/SP] (DIP28)]]
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[[Image:Minimig_v10_board_ram512x16.png|thumb|right|250px|[[Asynchronous static ram]] 512 x 16 bit (2 chips)]]
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[[Image:Minimig_v10_board_ram512x16.png|thumb|right|250px|IC6/IC7 - [[Asynchronous static ram]] 512 x 16 bit (2 chips)]]
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[[Image:Minimig_v10_board_rs232.png|thumb|right|250px|Serial [[RS232]] using [http://datasheets.maxim-ic.com/en/ds/MAX220-MAX249.pdf MAX232]]]
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[[Image:Minimig_v10_board_rs232.png|thumb|right|250px|IC2 - Serial [[RS232]] using [http://datasheets.maxim-ic.com/en/ds/MAX220-MAX249.pdf MAX232A] (SO16), output J3]]
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[[Image:Minimig_v10_board_sd_card.png|thumb|right|250px|[[SD Card]] slot]]
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[[Image:Minimig_v10_board_main_pwr.png|thumb|right|250px|IC1 - Main power supply]]
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[[Image:Minimig_v10_board_spare_io.png|thumb|right||Spare I/O]]
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[[Image:Minimig_v10_board_sd_card.png|thumb|right|250px|J11 - [[SD Card]] slot]]
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[[Image:Minimig_v10_board_spare_io.png|thumb|right||J9 - Spare I/O directly connected to FPGA]]<br>

Latest revision as of 12:30, 7 August 2007

Board schematic for Minimig board v1.0:

J1 - Audio output via 3,5mm jack
J4 - 4 bit resistor ladder D/A

In 15kHz mode:

/VSYNC = high (scart RGB enable)
/HSYNC = composite sync
IC5 - FPGA Xilinx XC3S400-4PQ208C
IC3/IC4 - FPGA core power +1,25V +2,5V using LM1117MP-ADJ
FPGA decoupling
J10 - Joystick 0
J6 - Joystick 1
J7 - Jtag
Program & Menu button, 31/15kHz selection, Power & Disc led
J5/J8 - Keyboard & Mouse connections
IC9 - MC68000
MC68000 Decoupling
IC8 - Generation of 4.433619 MHz PAL video MCLK using 74HC4060 (NTSC=3.579545MHz)

PATCH needed to get rev 1 board working:

Disconnect net SPI_DOUT from pin 81 of FPGA.
Connect net SPI_DOUT to pin 19 of FPGA (net USER3).
REASON: Pin 81 is an output during FPGA config that blocks SPI to MMC during startup.
IC10 - MCU PIC18LF252I/SP (DIP28)
IC6/IC7 - Asynchronous static ram 512 x 16 bit (2 chips)
IC2 - Serial RS232 using MAX232A (SO16), output J3
IC1 - Main power supply
J11 - SD Card slot
J9 - Spare I/O directly connected to FPGA


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