CS609-System Programming Assignment No. 3 december fall 2011

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Assignment [Total Marks 20]

Q No. 1

Write the C Program that can be used to program the master DMA controller, description of your program is as follows.

We have supposed that an I/O device have acquired the control of channel 1 of the master DMA controller and want to write the data from I/O device to RAM using demand transfer mode of DMA. You are required to program the required DMA internal registers such that I/O device can perform the demand transfer mode with above specifications.
In your program suppose the following things.

• Supposed you want to transfer the data from I\O device to Memory and have stored that data in a character array, i.e. global data in your program and name of that character array should be according to your VUID suppose mc060402111.
• Size of the data that I/O device want to write in the memory using the demand transfer mode of DMA should be calculated as follows. Take the last four digits of your VUID and represent them in a hexadecimal number. For example VUID mc060402111 have the value of last four digits ‘2111’ and these are represented in hexadecimal number as 0x2111 and load these values in the respected count register.

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