4 Consider a microprocessor that has a block I/O transfer instruction such as that found on the Z8000. Following its first execution, such an instruction takes five clock cycles to re-execute. However, if we employ a nonblocking I/O instruction, it takes a total of 20 clock cycles for fetching and execution. Calculate the increase in speed with the block I/O instruction when transferring blocks of 128 bytes. 5 A system is based on an 8-bit microprocessor and has two I/O devices. The I/O con- trollers 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?

4 Consider a microprocessor that has a block I/O transfer instruction such as that found on the Z8000. Following its first execution, such an instruction takes five clock cycles to re-execute. However, if we employ a nonblocking I/O instruction, it takes a total of 20 clock cycles for fetching and execution. Calculate the increase in speed with the block I/O instruction when transferring blocks of 128 bytes. 5 A system is based on an 8-bit microprocessor and has two I/O devices. The I/O con- trollers 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?

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Description: 4 Consider a microprocessor that has a block I/O transfer instruction such as that foundon the Z8000. Following its first execution, such an instruction takes five clock cyclesto re-execute. However, if we employ a nonblocking I/O instruction, it ta

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Question

4 Consider a microprocessor that has a block I/O transfer instruction such as that found
on the Z8000. Following its first execution, such an instruction takes five clock cycles
to re-execute. However, if we employ a nonblocking I/O instruction, it takes a total of
20 clock cycles for fetching and execution. Calculate the increase in speed with the
block I/O instruction when transferring blocks of 128 bytes.
5 A system is based on an 8-bit microprocessor and has two I/O devices. The I/O con-
trollers 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?

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