-bit ISA bus that takes six 8MHz clocks per transfer and compare it to a 32-bit PCI bus with a 66MHz clock doing a PCI burst of four
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Compute the peak I/O bandwidth of a 16-bit ISA bus that takes six 8MHz clocks per transfer and compare it to a 32-bit PCI bus with a 66MHz clock doing a PCI burst of four data values with 2-1-1-1 clock timing on the burst.
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- A common bus in a computer connects 16 source registers (each register is 32 bits) and one memory unit with word size of 32 bits also. If the bus is designed using multiplexers, answer the following: • What is the minimum number of multiplexers required? What is the minimum number of select lines each multiplexer has? If the bus is designed with three-state buffers and decoders, answer the following: • What is the minimum number of three-state buffers required? • What is the minimum number of decoders required? • What is the minimum size of each decodeFor a multiplexer based bus system in an 8 bit computer system with 4 registers: a- What is the MUX size we use? b- How many MUX do we need? c- How many select bit are required? d- Draw the suggested bus system showing full connections for one register.Give the maximum hex value that can be brought into the CPU at a time for a 8-bit bus.
- Try this: For register RO to R63 in a 16-bit bus system; what is the MUX size we use? and how many select bits are needed?Examination of the timing diagram of the 8237A indicates that once a block transfer begins, it takes three bus clock cycles per DMA cycle. During the DMA cycle, the 8237A transfers one byte of information between memory and I/O device. a. Suppose we clock the 8237A at a rate of 5 MHz. How long does it take to transfer one byte? b. What would be the maximum attainable data transfer rate? c. Assume that the memory is not fast enough and we have to insert two wait states per DMA cycle. What will be the actual data transfer rate?What is the difference between synchronous buses and nonsynchronous buses?
- Assume a data bus is 16 bits wide. The data and address lines are multiplexed. If the bus runs at a speed of 300MHz, how long will it take to transfer 15MB over the bus?A gaming device has to transfer a high definition 1280 x 720 x 3 video frame @ 30 frames/sec. The 32-bit system bus operates at 100MHz clock. It takes one clock cycle to make one transfer through the bus (i.e. D=1) and there is an overhead of ten clock cycles per transfer (i.e. O=10) Is this bus suitable for this system? If not, then what can be done to make it suitable? Explain. What if the bus operates in burst mode (burst size of 4)? Would it be suitable to use? Explain.Homework: Show how a 32Kbyte ROM module can be connected on an 8088 system using 2764 EPROM chips, occupying the address range starting from the address E0000H. Use the following address decoding circuits: Nand decoding circuits A line decoder and a Nand gate PLD decoding circuit Comparators only Line decoder and a comparator 1 Solution: A19 A18 A17 A16 A15 A14 A13 A12 A1... A. Memory Map Size of 2764 EPROM chips: Number of chips needed: Number of address lines: 66 2345
- 2. Suppose that we are given 32KB SRAM ICs and 8KB ROM ICs. We want to construct the address range for RAM to be from 00000H to 3FFFFH, and from 80000H to 8FFFFH. We also want to construct the address range for ROM to be from FC000H to FFFFFH. Show a possible address decoding circuit.Consider 16 KBps 10 device interfaced to 64-bit CPU using DMA interface in cycle- stealing mode. DMA contains 4-bit count register. Machine-cycle is 2 ms. What are the percentages of block time and busy time of CPU respectively?How many conductors are necessary for an address bus to have if it has to be able to address eight different devices? What happens if every single one of those components also has to be able to communicate with the I/O control device?