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Sven Riwoldt
2025-04-05 08:00:04 +02:00
parent 7610af6234
commit 3e40d5c61c
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18
tools/builtInChips/Screen.hdl
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@@ -1,24 +1,22 @@
// This file is part of www.nand2tetris.org
// and the book "The Elements of Computing Systems"
// by Nisan and Schocken, MIT Press.
// File name: tools/builtIn/Screen.hdl
// File name: tools/builtInChips/Screen.hdl
/**
* The Screen (memory map).
* Functions exactly like a 16-bit 8K RAM:
* 1. out(t)=Screen[address(t)](t)
* 2. If load(t-1) then Screen[address(t-1)](t)=in(t-1)
* Same functionality as a 16-bit 8K RAM:
* If load is asserted, the value of the register selected by
* address is set to in; Otherwise, the value does not change.
* The value of the selected register is emitted by out.
*
* The built-in chip implementation has the side effect of continuously
* This built-in implementation has the side effect of continuously
* refreshing a visual 256 by 512 black-and-white screen, simulated
* by the simulator. Each row in the visual screen is represented
* by 32 consecutive 16-bit words, starting at the top left corner
* of the visual screen. Thus the pixel at row r from the top and
* column c from the left (0<=r<=255, 0<=c<=511) reflects the c%16
* bit (counting from LSB to MSB) of the word found in
* Screen[r*32+c/16].
* column c from the left (0<=r<256, 0<=c<512) reflects the c%16
* bit (counting from LSB to MSB) of the word found in Screen[r*32+c/16].
*/
CHIP Screen {
IN in[16], // what to write