13618992
Description
Flashcards by Steven Pearson, updated more than 1 year ago
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Created by Steven Pearson
about 6 years ago
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| Question | Answer |
| what is a PLD draw what it looks like |
1) It is a programmable logic device, it uses and or gates
Inputs are fed into the AND array, which is then fed into an OR array.
Image:
Pic 2 (binary/octet-stream)
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| List the 6 advantages of using a PLD | -less board space -faster -low power consumption -cheaper assembly -highly reliable -free software available |
| what is the symbols for AND and OR gates in a PLD |
Image:
Pic1 (binary/octet-stream)
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| What are the 3 types of PLD's | PROM (programmable read only memory ) PAL (programmable array logic) PLA (programmable logic array) |
| Explain the operation of PROM | - it has a fixed AND array -it has programmable OR gates |
| Explain the operation of PAL | -It has programmable AND array -it has Fixed OR array |
| Explain the operation of PAL | -It has both programmable AND array and OR array |
| how does a PLA work? | The AND & OR gates inside are 'fused' until programmed by the user, using boolean functions. -it uses a group of K AND gates each of 2n inputs |
| what does CPLD stand for? what is it? | Complex programmable logic device -Contains multiple blocks of PLD's connected together using a global interconnection matrix -Each block can be programmed as can the Global matrix |
| Draw a CPLD | |
| what are the types of FPGA's? | 1. Programmable logic structure, 2. Programmable routing structure 3. Programmable Input/Output (I/O). |
| what is a Programmable logic structure? | its a 2 dimensional array of configurable logic block (clb) |
| what is a Programmable routing structure ? | they allow for flexible interconnection of CLB's |
| what is Programmable Input/Output (I/O)? | they are mainly buffers input, output or in/outputs they allow the pins of the FPGA to function. |
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