Which of the following statements regarding PCI bus mastering are TRUE? (Choose all that apply.)
A.
PCI bus mastering allows for the removal of PCI devices without first powering down the system.
B.
PCI bus mastering allows multiple PCI devices to run simultaneously without locking each other out.
C.
PCI bus mastering makes use of direct memory access (DMA) to pass control of the bus to the PCI devices.
D.
PCI bus mastering allows PCI devices to transfer data to and from each other without referencing the CPU or the system memory.
Explanation:
PCI bus mastering allows multiple PCI devices to run simultaneously without locking each other out and it allows PCI devices to transfer data to and from each other without referencing the CPU or the system memory.
Incorrect
Answers:
A: PCI hot-swap technology allows you to insert or remove PCI devices from a system without having to shut down the system’s power.
C: There are not DMA channels on the PCI bus. Instead, bus mastering performs similar functions formerly assigned to DMA channels.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 117-120.