Assignment COA Nikhil
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Computer Organization & Architecture Assignment #2 1# Consider a magnetic disk drive with 8 surfaces, 512 tracks per surface, and 64 sectors per track. Sector size is 1 KB. The average seek time is 8 ms, the track-to- track access time is 1.5 ms, and the drive rotates at 3600 rpm. Successive tracks in a cylinder can be read without head movement. a. What is the disk capacity? b. What is the average access time? Assume this file is stored in successive sectors and tracks of successive cylinders, starting at sector 0, track 0, of cylinder i. c. Estimate the time required to transfer a 5-MB file. d. What is the burst transfer rate? 2# A similar instruction format is used in the Zilog Z8000 microprocessor family. In this case, there is a direct port addressing capability, in which a 16-bit port address is part of the instruction, and an indirect port addressing capability, in which the instruction references one of the 16-bit general purpose registers, which contains the port address. How many ports can the Z8000 address in each I/O addressing mode? 3# A system is based on an 8-bit microprocessor and has two I/O devices. The I/O controllers for this system use separate control and status registers. Both devices handle data on a 1-byte-at-a-time basis. The first device has two status lines and three control lines. The second device has three status lines and four control lines. a. How many 8-bit I/O control module registers do we need for status reading and control of each device? b. What is the total number of needed control module registers given that the first device is an output-only device? c. How many distinct addresses are needed to control the two devices? 4# Assume a task is divided into four equal-sized segments and that the system builds an eight-entry page descriptor table for each segment. Thus, the system has a combination of segmentation and paging. Assume also that the page size is 2 KBytes. a. What is the maximum size of each segment? b. What is the maximum logical address space for the task? c. Assume that an element in physical location 00021ABC is accessed by this task. What is the format of the logical address that the task generates for it? What is the maximum physical address space for the system?
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Transcript of Assignment COA Nikhil
Computer Organization & ArchitectureAssignment #21# Consider a magnetic disk drive with 8 surfaces, 512 tracks per surface, and 64 sectors per track. Sector size is 1 KB. The average seek time is 8 ms, the track-to-track access time is 1.5 ms, and the drive rotates at 3600 rpm. Successive tracks in a cylinder can be read without head movement.a. What is the disk capacity?b. What is the average access time? Assume this file is stored in successive sectors and tracks of successive cylinders, starting at sector 0, track 0, of cylinder i.c. Estimate the time required to transfer a 5-MB file.d. What is the burst transfer rate?2# A similar instruction format is used in the Zilog Z8000 microprocessor family. In this case, there is a direct port addressing capability, in which a 16-bit port address is part of the instruction, and an indirect port addressing capability, in which the instruction references one of the 16-bit general purpose registers, which contains the portaddress. How many ports can the Z8000 address in each I/O addressing mode?3# A system is based on an 8-bit microprocessor and has two I/O devices. The I/O controllers for this system use separate control and status registers. Both devices handle data on a 1-byte-at-a-time basis. The first device has two status lines and three control lines. The second device has three status lines and four control lines.a. How many 8-bit I/O control module registers do we need for status reading and control of each device?b. What is the total number of needed control module registers given that the first device is an output-only device?c. How many distinct addresses are needed to control the two devices?4# Assume a task is divided into four equal-sized segments and that the system builds an eight-entry page descriptor table for each segment. Thus, the system has a combination of segmentation and paging. Assume also that the page size is 2 KBytes.a. What is the maximum size of each segment?b. What is the maximum logical address space for the task?c. Assume that an element in physical location 00021ABC is accessed by this task. What is the format of the logical address that the task generates for it? What is the maximum physical address space for the system?
