University:
Massachusetts Institute of Technology
Course:
6.111 | Introductory Digital Systems Laboratory
Academic year:

2023
Views:

286

Pages:

2
Author:

sonalhava9qv

EXPRIN(1) EXPRIN(1) NAME exprin, exprout, expression, expressdat - create and con vert data for use in PROM lookup tables SYNOPSIS expri xxx.exp exprin n >x >xx expro xx xxx.e xx xxx.dat exprout ut < >x expre expressi ssion xxxx on xx expre expressd ssdat xxxx at xx DESCRIPTION xprin and e xprout The two programs e exprin exprout together form r_ e_ "friendly" system for generating PROM data for an e_ _x_ p_ s_ _i_n s_o_ of a single input variable. Applications might include: 1) A table lookup for trigonometric values. This would be useful in games which need to transfer from polar to Cartesian coordinates. 2) A table lookup for logarithmic values. useful for logarithmic multiplication. This would be To create xxxx.ntl which is ready to be sent to the PROM xpre essi programmer use the shell script e on : expr ssion expression xxxx xpre essd To create xxxx.dat use the shell script e expr ssdat at : expressdat xxxx This is helpful when you want e_ r_ e_ s_ o_s into a single PROM. p_ s_ _x_ i_n_ to concatenate Use several cat a.dat b.dat > final.dat and then edit final.dat SET_ADDRESS command. to insert the appropriate # r_ e_ s_ r_ e_ s_ On line help is available for e_ _x_ p_ s_o_ i_n and e_ _x_ p_ s_a_. d_t_ r_ e_ s_ The shell script e_ _x_ p_ s_o_ i_n consists of the three programs expri xprout , and da t2ntl piped together. The script n , e exprin exprout dat2ntl e_ r_ es __ t2ntl program. E xprin and e xprout p_ s_a_ Exprin _x_ d_t omits the da dat2ntl exprout t2ntl is described in another man are described below; da dat2ntl page. xprin , is simply an interactive guide The first program, e exprin xprout shown below. It for creating a file to be used by e exprout may be created and edited using an editor instead of using 1 a exprin. exprin. NUMBER_OF_STEPS = 314; START_ADDRESS = 0; INPUT_INITIAL_VALUE = 0; STEP_SIZE = .01; 128 + 127 * SIN(INPUT); xprin and used by exprout Example file created by e exprin exprout e_p_ r_ e_ s_ The _x_ s_o_ i_n must obey the following rules. An expression can be of arbitrary size. It must be in infix form. It may contain the following binary operators: + - * / and the following unitary functions: sin, cos, tan, asin, acos, atan, sinh, cosh, tanh, log, exp, abs, and sqrt. Parentheses can be used in the usual manner. It may contain any real number and the single variable: INPUT. The variable INPUT takes NUMBER_OF_STEPS steps starting at the initial value INPUT_INITIAL_VALUE. Each step incre ments INPUT by the value of STEP_SIZE. NUMBER_OF_STEPS outputs will be created to be sent to the PROM programmer starting at the address START_ADDRESS. The output will be rounded to the nearest integer. The parser is not case sensitive. decimal. Spaces are ignored. All numbers are interpreted as The output of exprout exprout is in the standard form used by the program dat2n dat2ntl tl FILES SE EE E AL ALSO dat2ntl(.) BUGS 2

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