Z80 Computer on DE1 Development board
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Z80 Computer on DE1 Development board
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Arquitecture
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Arquitecture
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------------
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------------
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SW9 - Reserved - Reset
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SW9 - Reserved - Reset
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SW8 - Reserved
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SW8 - Reserved
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LEDR9 - Reserved
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LEDR9 - Reserved
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LEDR8 - Reserved
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LEDR8 - Reserved
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Memory
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Memory
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------
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------
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0000H - 01FFH - ROM (0 - 8191)
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0000H - 01FFH - ROM (0 - 8191)
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2000H - 3FFFH - VIDEO RAM (8192 - 16383)
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2000H - 3FFFH - VIDEO RAM (8192 - 16383)
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4000H - FFFFH - RAM (16384 - 65535)
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4000H - FFFFH - RAM (16384 - 65535)
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IO
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IO
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--
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--
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Output Ports
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Output Ports
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------------
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01H - Green Leds (7-0)
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01H - Green Leds (7-0)
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02H - Red Leds (7-0)
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02H - Red Leds (7-0)
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10H - HEX1 - HEX0
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10H - HEX1 - HEX0
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11H - HEX3 - HEX2
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11H - HEX3 - HEX2
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Inputs
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Inputs
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------
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------
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20H - SW(7-0)
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20H - SW(7-0)
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30H - KEY(3-0)
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30H - KEY(3-0)
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Video
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Video
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-----
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-----
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2000h - 1FFFH Video RAM Memory
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2000h - 1FFFH Video RAM Memory
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2000h - 24B0H Text Video memory
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2000h - 24B0H Text Video memory
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Keyboard
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Keyboard
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--------
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--------
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80H - Read Keyboard Ascii code
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80H - Read Keyboard Ascii code
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Input/Output
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Input/Output
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------------
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------------
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All write operations to GPIO are buffered.
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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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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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write any value to port C0 (GPIO0) or C1 (GPIO1)
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A0 - GPIO0 (7-0)
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A0 - GPIO0 (7-0)
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A1 - GPIO0 (15-8)
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A1 - GPIO0 (15-8)
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A2 - GPIO0 (23-16)
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A2 - GPIO0 (23-16)
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A3 - GPIO0 (31-24)
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A3 - GPIO0 (31-24)
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A4 - GPIO0 (35-32)
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A4 - GPIO0 (35-32)
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B0 - GPIO1 (7-0)
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B0 - GPIO1 (7-0)
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B1 - GPIO1 (15-8)
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B1 - GPIO1 (15-8)
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B2 - GPIO1 (23-16)
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B2 - GPIO1 (23-16)
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B3 - GPIO1 (31-24)
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B3 - GPIO1 (31-24)
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B4 - GPIO1 (35-32)
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B4 - GPIO1 (35-32)
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C0 - GPIO0 Write
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C0 - GPIO0 Write
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C1 - GPIO1 Write
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C1 - GPIO1 Write
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--
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--
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Reference Sample ROM
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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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It is provided a ROM with a reference application, and the correspnding
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Z80 source codes.
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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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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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VGA monitor and PS/2 keyboard.
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The program will show how to use:
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The program will show how to use:
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Input push buttons
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Input push buttons
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Input Switches
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Input Switches
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PS/2 keyboard
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PS/2 keyboard
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Video text out
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Video text out
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Leds
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Leds
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7seg display
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7seg display
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The program starts waiting for keys to be typed in the keyboard.
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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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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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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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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 bytes are read sequencially.
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The address read are displayed in the seven seg display, and
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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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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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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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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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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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takes effect after a Z80 reset.
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To reset the Z80, use SW9.
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To reset the Z80, use SW9.
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Hope you enjoy.
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Hope you enjoy.
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TO-DO:
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TO-DO:
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----
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----
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- Expand the character sets (this versions have only uppercase letters and numbers)
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- Expand the character sets (this versions have only uppercase letters and numbers)
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- 80x40 Video display
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- 80x40 Video display
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- Serial communication
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- Serial communication
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- Monitor program to allow download of programs by 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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- Mass storage device (SD/MMC)
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