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The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
book

The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition

by Lyla B. Das
May 2024
Intermediate to advanced content levelIntermediate to advanced
665 pages
23h 2m
English
Pearson India
Content preview from The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
464 THE x86 MICROPROCESSORS
command in the CCW. After the communication blocks have been set up, the CPU enables the
channel attention signal to inform the IOP to start its I/O operation.  e CPU then continues
with its own program.  e IOP responds to the channel attention signal by placing the address
of the control block into its program counter.  e IOP refers to the control block and sets the
busy fl ag. It then checks the operation in the CCW.  e PB (parameter block) address and TB
(task block) address are then transferred into internal IOP registers.  e IOP starts executing
the program in the task block using the information in the parameter block.  e entries in the
parameter block depend on the I/O device.  is, in short, is how ...
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Publisher Resources

ISBN: 9781282663169