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Revision as of 00:28, 31 March 2009
Contents
== Compute Engine Design Specifications ==
The COMPUTE ENGINE of SCOORE is responsible for all the calculations of the processor. SCOORE is a clustered architecture, we have FOUR main units which comprise the COMPUTE ENGINE.
- AUNIT is responsible for all the "simple arithmetic operations" of the CPU.(Single Port)
- BUNIT is responsible for branch operations. (Dual Port)
- CUNIT handles all floating point operations. (Single Port)
- MUNIT handles all Load and Store operations. (Dual Port)
A more detailed description of each individual block is given below.
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Individual Unit Descriptions
Each of the four clusters in the CE holds 128 registers in its Register File. There are a total of 512 registers. A 9-bit binary number is assigned to each register. Since there are only 512 registers, the highest 2-bits are indicative of the CE cluster/unit to which they belong.
| Register Number | Highest 2 bits | Compute Engine (CE) |
|---|---|---|
| 0 - 127 | 00 | A Unit RF |
| 128 - 255 | 01 | B Unit RF |
| 256 - 383 | 10 | C Unit RF |
| 384 - 511 | 11 | M Unit RF |
AUNIT
aunit_stage1
-Local/Ext/Imm Src Sel. Logic -Reset/Busy Logic |
aunit_stage2
-Reservation Station Logic -Forwarding Logic -Update Logic |
salu
-Single Cycle Execution Stage |
write_back
Reg. File |
|---|
The AUNIT executes the following SPARC V8 instructions:
BUNIT
bunit_stage1
-Local/Ext/Imm Src Sel. Logic -Reset/Busy Logic |
bunit_stage2
-Reservation Station Logic -Forwarding Logic -Update Logic |
balu/salu
-Single Cycle Execution Stage |
write_back
Reg. File |
|---|
The BUNIT executes the following SPARC V8 instructions:
CUNIT
cunit_stage1
-Local/Ext/Imm Src Sel. Logic -Reset/Busy Logic |
cunit_stage2
-Reservation Station Logic -Forwarding Logic -Update Logic |
FPU
-Multiple Cycle Execution Stage |
write_back
Reg. File |
|---|
The CUNIT executes the following SPARC V8 instructions:
MUNIT
munit_stage1
-Local/Ext/Imm Src Sel. Logic -Reset/Busy Logic |
munit_stage2
-Reservation Station Logic -Forwarding Logic -Update Logic |
CACHE
-Multiple Cycle Execution Stage |
write_back
Reg. File |
|---|
The MUNIT executes the following SPARC V8 instructions:
--Rigo Dicochea 09:47, 30 March 2009 (PDT)
