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TSC695F-25MA Datenblatt(PDF) 5 Page - ATMEL Corporation

Teilenummer TSC695F-25MA
Bauteilbeschribung  Rad-Hard 32-bit SPARC Embedded Processor
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Hersteller  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

TSC695F-25MA Datenblatt(HTML) 5 Page - ATMEL Corporation

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TSC695F
4118J–AERO–08/04
P
roduct Description
Integer Unit
The Integer Unit (IU) is designed for highly dependable space and military applications,
and includes support for error detection. The RISC architecture makes the creation of a
processor that can execute instructions at a rate approaching one instruction per pro-
cessor clock possible.
To achieve that rate of execution, the IU employs a four-stage instruction pipeline that
permits parallel execution of multiple instructions.
Fetch - The processor outputs the instruction address to fetch the instruction.
Decode - The instruction is placed in the instruction register and is decoded. The
processor reads the operands from the register file and computes the next
instruction address.
Execute - The processor executes the instruction and saves the results in temporary
registers. Pending traps are prioritized and internal traps are taken during this stage.
Write - If no trap is taken, the processor writes the result to the destination register.
All four stages operate in parallel, working on up to four different instructions at a time. A
basic ‘single-cycle’ instruction enters the pipeline and completes infour cycles.
By the time it reaches the write stage, three more instructions have entered and are
moving through the pipeline behind it. So, after the first four cycles, a single-cycle
instruction exits the pipeline and a single-cycle instruction enters the pipeline on every
cycle. Of course, a ’single-cycle’ instruction actually takes four cycles to complete, but
they are called single cycle because with this type of instruction the processor can com-
plete one instruction per cycle after the initial four-cycle delay.
Floating-point Unit
The FLoating Point Unit (FPU) is designed to provide execution of single and double-
precision floating-point instructions concurrently with execution of integer instructions by
the IU. The FPU is compliant to the ANSI/IEEE-754 (1985) floating-point standard.
The FPU is designed for highly dependable space and military applications, and
includes support for concurrent error detection and testability.
The FPU uses a four stage instruction pipeline consisting of fetch, decode, execute and
write stages (F, D, E and W). The fetch unit captures instructions and their addresses
from the data and address buses. The decode unit contains logic to decode the floating-
point instruction opcodes. The execution unit handles all instruction execution. The exe-
cution unit includes a floating-point queue (FP queue), which contains stored floating-
point operate (FPop) instructions under execution and their addresses. The execution
unit controls the load unit, the store unit, and the datapath unit. The FPU depends upon
the IU to access all addresses and control signals for memory access. Floating-point
loads and stores are executed in conjunction with the IU, which provides addresses and
control signals while the FPU supplies or stores the data. Instruction fetch for integer
and floating-point instructions is provided by the IU.
The FPU provides three types of registers: f registers, FSR, and the FP queue. The FSR
is a 32-bit status and control register. It keeps track of rounding modes, floating-point
trap types, queue status, condition codes, and various IEEE exception information. The
floating-point queue contains the floating-point instruction currently under execution,
along with its corresponding address.


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