VHDL Implementation for the SRC ALU Edgar Arce
- Slides: 25
VHDL Implementation for the SRC ALU Edgar Arce Miguel González Miguel Padilla José F. Ocasio December 15, 2004
Outline ¡ ¡ ¡ ¡ Introduction Overview Adder Register B interface ALU_hi Lowalu (1 bit) ¡ ¡ ¡ ¡ Lowalu(10 bits) ALU_System ALU_ADC Conclusions References Acknowledgements
Introduction ¡ ¡ ¡ Simple Risc Computer - architecture designed specially for educational purposes Simple structure 32 bit CPU For INEL 4215 purposes, it has been simplified to 8 bits Simplified ALU executes SRC operations for 10 bits inputs Next - an implementation for the 10 bit SRC ALU with an additional instruction called ADC
Overview General diagram of the SRC ALU
ADC Sequence
ADC Sequence Cont.
ADC Sequence cont.
ADC Sequence cont.
ADC Sequence cont.
ADC Sequence cont.
ADC Sequence cont.
ADC Sequence cont.
Conclusions ¡ ¡ Instruction C = B needs no additional circuitry to be implemented, it is made by no activating any signal. ALU of 10 bits instead of 8 bits because of Program Counter. Implemented ADDER not a ADDER_SUBSRACTOR, because an additional module is needed to implement a NOT function. When a SHIFT function is called the ALU only shifts once because the Control Unit handles the counter of it.
References http: //www. gmvhdl. com/VHDL. html ¡ http: //www. isee. zju. edu. cn/hmx/asi clab 2000/lab 3 help/tutvhdl. h tm ¡ http: //www. wearcam. org/ece 385/le ctureflipflops/ ¡ Computer Systems Design and Architecture, 2/E , Heuring, V. P. y Jordan, H. F. , Prentice Hall, 2004. ¡
Acknowledgements To God. ¡ Always helpful Google. ¡ Buhos Society ¡ To the Buho VHDL Sensei Marcos Mejias. ¡ To the lobby’s benches for giving us a place to sleep. ¡ To Chori for supplying us with healthy food at 3: 00 am. ¡
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