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Z80 Computer on DE1 Development board
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Arquitecture
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------------
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SW9 - Reserved - Reset
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SW8 - Reserved
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LEDR9 - Reserved
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LEDR8 - Reserved
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Memory
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------
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0000H - 3FFFH - ROM
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4000H - 52BFH - VIDEO RAM
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52C0H - 57FFH - System Variables
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5800H - 5FFFH - Characters definition RAM
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6000H - FFFFH - RAM memory
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Registers
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---------
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52C0H - Z80SOC VERSION (0 = DE1, 1 = S3E)
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IO (Ports)
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----------
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01H - Out - Green Leds (7-0)
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02H - Out - Red Leds (7-0)
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10H - Out - HEX3 - HEX2
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11H - Out - HEX1 - HEX0
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20H - In - SW(7-0)
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30H - In - KEY(3-0)
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80H - In - PS/2 keyboard
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90H - Out - Video
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91H - InOut - Video cursor X
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92H - InOut - Video cursor Y
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GPIO Expansion pins
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-------------------
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All write operations to GPIO are buffered.
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To write the buffered signals to the pins, the Z80 must
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write any value to port C0 (GPIO0) or C1 (GPIO1)
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A0 - GPIO0 (7-0)
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A1 - GPIO0 (15-8)
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A2 - GPIO0 (23-16)
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A3 - GPIO0 (31-24)
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A4 - GPIO0 (35-32)
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B0 - GPIO1 (7-0)
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B1 - GPIO1 (15-8)
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B2 - GPIO1 (23-16)
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B3 - GPIO1 (31-24)
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B4 - GPIO1 (35-32)
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C0 - GPIO0 Write
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C1 - GPIO1 Write
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--
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Reference Sample ROM
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It is provided a ROM with a reference application, and the correspnding
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Z80 source codes.
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To use the application you will need to connect the DE1 board to a
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VGA monitor and PS/2 keyboard.
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The program will show how to use:
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Input push buttons
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Input Switches
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PS/2 keyboard
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Video text out (memory mapped and port mapped io)
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Leds
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7seg display
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Redefinition of characters
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The program starts waiting for keys to be typed in the keyboard.
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The characters are shown on the 40x30 video (VGA).
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If "A" is pressed, then the program starts another routine,
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that will write bytes into SRAM. After 255 bytes are written,
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the bytes are read sequencially.
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The address read are displayed in the seven seg display, and
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the byte read displayed in the leds (binary format).
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When finished, waits for KEY0 (DE1 board) and then restart again.
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The switches (7-0) are used as input to calculate delays. Try
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changing these switches to speed up ou slow down the leds. It only
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takes effect after a Z80 reset.
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To reset the Z80, use SW9.
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The looping text inside the box demonstrates how to access the video ram.
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To change speed of scrolling, use the switches (SW).
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To modify the screen layout (rows x columns), edit the file z80soc_pack.vhd and find the constants:
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- vid_cols = number of columns (maximum is 80)
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- vid_lines = number of lines (maximum is 40)
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- pixelsxchar = 1 every character will be plotted using 8x8 pixels
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- pixelsxchar = 2 every character will be plotter using 16x16 pixels
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The column x lines total must not be over 3200, because this is the capacity defined for the video ram.
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The characters can be redefined. Every character must have 8 bytes (8 x 8 bits).
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Hope you enjoy.
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TO-DO:
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----
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- (done)80x40 Video display
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- Serial communication
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- Monitor program to allow download of programs by serial communication
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- Mass storage device (SD/MMC)
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- Video colors
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