Nvis 5586A
Nvis Technologies Pvt. Ltd.
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The BIU is also responsible for generating bus control signals such as those for memory read
or write and I/O read or write.
Execution Unit:
The Execution unit is responsible for decoding and executing all instructions. The EU
extracts instructions from the top of the queue in the BIU, decodes them, generates operands
if necessary, passes them to the BIU and requests it to perform the read or write bys cycles to
memory or I/O and perform the operation specified by the instruction on the operands.
During the execution of the instruction, the EU tests the status and control flags and updates
them based on the results of executing the instruction. If the queue is empty,
the EU waits
for the next instruction byte to be fetched and shifted to top of the queue.
When the EU executes a branch or jump instruction, it transfers control to a location
corresponding to another set of sequential instructions. Whenever this happens, the BIU
automatically resets the queue and then begins to fetch instructions from this new location to
refill the queue.
Summary of Contents for 5586A
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