The Intel (or i) Programmable Peripheral Interface (PPI) chip was developed and .. In this mode, the may be used to extend the system bus to a slave microprocessor or to transfer data bytes to and from a floppy disk controller. PPI is a general purpose programmable I/O device designed to by interfacing with microprocessor · I/O Interface (Interrupt and DMA Mode). Direct memory access with DMA controller / Step After accepting the DMA service request from the DMAC, the CPU will send hold Interface with microprocessor for 1’s and 2’s complement of a number · Parallel .

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In this mode, the may be used to extend the system bus to a slave microprocessor or to transfer data bytes to and from a floppy disk controller. Analog Communication Interview Questions.

If from the previous operation, port A is initialized as an output port and if is not reset before using the current configuration, then there is a possibility of damage of either the input device connected or or both, since both and the device connected will be sending out data. These are the four least significant address contropler. All of these chips were originally available in a pin DIL package.

These are the four least significant address lines. Embedded Systems Interview Questions.

Microprocessor 8257 DMA Controller Microprocessor

In the master mode, these lines are used to send higher byte of the generated address to the latch. It is the hold acknowledgement signal which indicates the DMA controller that the bus has been granted to the requesting peripheral by the CPU when it is set to 1.

It is an 88255 bidirectional tri-state input line, which is used by the CPU to read internal registers of in the Slave mode.

In the master mode, it is used to read data from controlper peripheral devices during a memory write cycle. Read This Tips for writing resume in slowdown What do employers look for in a resume?

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This signal is used to receive the hold request signal from the output device.

Digital Logic Design Interview Questions. When we wish to use port A or port B for handshake strobed input or output operation, we initialise that port in mode 1 port A and port B can be initilalised to operate in different modes, i. In the master mode, it also helps in reading the data from the peripheral devices during a memory write cycle.

It is an active-low bidirectional tri-state input line, which helps to read the internal registers of by the CPU in the Slave mode. The Intel or i Programmable Peripheral Interface PPI chip was developed and manufactured by Intel in the first half of the s for the Intel microprocessor. These are bidirectional, data lines which are used to interface the system bus with the internal data bus of DMA controller.

In the master mode, it is used to load the data to the peripheral devices during DMA memory read cycle. Digital Logic Design Practice Tests. Port A can be used for bidirectional handshake data transfer. The two halves of port C can be either used together as an additional 8-bit port, or they can be used as individual 4-bit ports. If an input changes while the port is being read then the result may be indeterminate.

These lines can also act as strobe lines for the requesting devices. Analogue electronics Interview Questions. It is the hold acknowledgement signal which indicates the DMA controller that the bus has been granted to the requesting peripheral by the CPU when it is set to 1.

Top 10 facts why you need a cover letter? Some of the pins of port C function as handshake lines.

Direct Memory Access (DMA) Data Transfer – Electronics Engineering Study Center

It is an active-low chip select line. Analogue electronics Practice Tests. It is the active-low three state signal which is used to write the data to the addressed memory location during DMA write operation. How to design your resume? This is required because the data only stays on the bus for one cycle. Rise in Demand for Talent Here’s how to train middle managers This is how banks are wooing startups Nokia to cut thousands of jobs.

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It is designed by Intel to transfer data at the fastest rate. Each line of port C PC 7 – PC 0 can be set or reset by writing a suitable value to the control word register.

Intel A Programmable Peripheral Interface

In the master mode, they are the outputs which contain four least significant memory address output lines produced by In the master mode, the lines which are used to send higher byte of the generated address are sent to the latch. For port B in this mode irrespective of whether is acting as an input port or output portPC0, PC1 and PC2 pins function as ema lines.

In the slave mode, it is connected with a DRQ input line Computer architecture Practice Tests. In the Slave mode, it carries command words to and status word from Interview Tips 5 ways to be authentic in an interview Tips to help you face your contrpller interview Top 10 commonly asked BPO Interview questions 5 things you should never controlleer in any job interview Best job interview tips for job seekers 7 Tips to recruit the right candidates in 5 Dam interview questions techies fumble most What are avoidable questions in an Interview?

When the fixed priority mode is selected, then DRQ 0 has the highest priority and DRQ 3 has the lowest priority among them. The is a member of the MCS Family of chips, designed by Intel for use with their and microprocessors and their descendants [1]. Views Read Edit View history. This signal helps to receive the hold request signal sent from the cpntroller device.