RAM 4.5 BUX II Series Bedienungsanleitung PDF herunterladen (Seite 14)

Jianjian Song LogicWorks 4 Tutorials (5/15/03) Page 14 of 14

5 Tutorial #4: Making a ROM device with a hex file

5.1 Objective: to create a ROM device that is initialized by reading a text file.

5.2 Create a plain text file

ROM content can be stored in a plain text file as hexadecimal numbers. One easy way to do it is

to have one line for each memory location. Here is an example of 4x92 ROM with two address

lines and 92 bits at each address. Every line in the text file must have exact the same number of hex

numbers as the bit length. LogicWorks reads each line with left alignment. If the number of bits is not 92

on a line, the highest bits will not be initialized.

436F6B65202020202020050

4469657420436F6B6520050

436865727279436F6B65350

4C6970746F6E20546561400

The first ten byes in each line are ASCII characters and the last three hex numbers are binary numbers.

They represent the following text.

Coke $0.50

Diet Code $0.50

CherryCoke $3.50

Lipton Tea $4.00

There may be spaces in between the characters and the three digit number if a name has less than ten

characters.

5.3 Create a Rom that is initialized from a file

Choose Simulation-PROM/RAM/PLA Wizard. Select PROM and click next. In the PROM Symthesizer window,

select Read data from a raw hex file and click next. Choose Select Raw Hex File and choose the file to be read from.

If there is no error opening the file, it will be read and the ROM will be initialized with content from the file. You

can now save the ROM as a component.

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RAM 4.5 BUX II Series Bedienungsanleitung Seite 14