From 9c0cb1d1c32724fc95ac9548e4f8d873d3adaccc Mon Sep 17 00:00:00 2001 From: Frederick Yin Date: Tue, 16 Aug 2022 11:53:39 +0800 Subject: nand2tetris software suite --- tools/builtInChips/ROM32K.hdl | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 tools/builtInChips/ROM32K.hdl (limited to 'tools/builtInChips/ROM32K.hdl') diff --git a/tools/builtInChips/ROM32K.hdl b/tools/builtInChips/ROM32K.hdl new file mode 100644 index 0000000..929f824 --- /dev/null +++ b/tools/builtInChips/ROM32K.hdl @@ -0,0 +1,30 @@ +// 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/ROM32K.hdl + +/** + * Read-Only memory (ROM) of 16K registers, each 16-bit wide. + * The chip is designed to facilitate data read, as follows: + * out(t) = ROM32K[address(t)](t) + * In words: the chip always outputs the value stored at the + * memory location specified by address. + * + * The built-in chip implementation has a GUI side-effect, + * showing an array-like component that displays the ROM's + * contents. The ROM32K chip is supposed to be pre-loaded with + * a machine language program. To that end, the built-in chip + * implementation also knows how to handle the "ROM32K load Xxx" + * script command, where Xxx is the name of a text file containing + * a program written in the Hack machine language. When the + * simulator encounters such a command in a test script, the code + * found in the file is loaded into the simulated ROM32K unit. + */ + +CHIP ROM32K { + + IN address[15]; + OUT out[16]; + + BUILTIN ROM32K; +} -- cgit v1.2.3