its is the ppt about CYBER-205 super computer architecture. it gives brief description about cyber 205

1. CYBER-205
- Peddinti Vamsi

2. HISTORY BEHIND CYBER-205
It took 20 years of evolution in scientific
computing by the CDC (control data
corporation) to came into existence.
Previous versions from CDC are 6600/7600 ,
STAR-100 and CYBER-203 etc.
CYBER – 205 became available in 1981.

3. ADVANTAGES CYBER-203
CYBER-203 used semiconductor memory
Concurrent scalar processing
Faster memory interface which permits
instructions to be issued for every 20ns.

4. ENHANCEMENTS IN CYBER-205 OVER CYBER-
203
Usage of entire LSI circuitry with large bipolar
memory.
Additional vector instructions.
Support by NOS based OS.

5. WHAT ARE LSI AND NOS
LSI means Large scale integrated
circuits
NOS means network operating system
which is used for communication
between the hardware, systems etc.

6. FEATURES OF CYBER-205
Basic pipeline clock period is 20ns.
Each memory cycle takes 80ns.
Only 26 LSI chip types are used which increases
the system reliability and maintainability.
Bipolar main memory which access 4 million 64-bit
words within 80ns clock cycle time.
Memory access patterns includes 512 bit super
words (8 64-bit words) for vector operands and full
words and half words(32-bit) for scalar operands.

7. CYBER-205 BASIC BLOCK DIAGRAM

8. WHAT HAPPENS INSIDE THE CYBER-205
Scalar processor executes all instructions which are not
related to vector mode.
Stream unit coordinates the instruction processing
between scalar and vector processors.
A load/storage unit controls the data between register
file and storage.
Vector processor can have 4 vector arithmetic pipes
and a string unit.
These 4 pipes are used to do vector add/sub,
mul/divide, sqrt, logical shift operations.
Similar way the Scalar processor also can have 5 pipes
for add/sub, mul,log,shift divide, sqrt over 32/64bit
scalars.

9. FEW MORE INFORMATION
CYBER-205 can have more startup time than
CRA-1.
Control vectors are used to address data in
nonconsecutive locations.
Each pipe in the processors can have 2 input
streams and 1 output stream.
Peak speed of scalar processor is 50
megaflops .
Vector pipes can produce a maximum rate
of 200 megaflops for 64-bit words and 400
megaflops for 32-bit words

11. THANK YOU