Programmable Logic Devices

Programmable logical system Devices

Configuring an FPGA

CMPE 415

Con?guration Files and Cells The end result (as you know) of the design ?ow is a get windvict?guration ?le or bit ?le that is employ to program the FPGA. For SRAM-based, EEPROM and FLASH FPGAs, the bit ?le pilfertains both con?guration data and con?guration commands. The commands tell the FPGA what to do with the data. For anitfuse, the ?le contains merely con?guration data. Con?guration cells are present in the thingmajig to allow the interconnect, I/O and other features of the FPGA to be programmed. For example, deep down the PLB, the MUXs select input needs a con?guration cell. The register needs con?guration cells to specify whether it is to act as a FF or a latch, whether it latches using a positive- or negative-going clk, and whether it is initialized to a 0 or a 1.

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1966

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Programmable Logic Devices

Configuring an FPGA

CMPE 415

Con?guring the FPGA A 4-input LUT contains 16 con? guration cells. The con? guration cells are typically connected in a keen-sighted scan chain.

The Design Warriors Guide to FPGAs, ISBN 0750676043, Copyright(C) 2004 Mentor artistry Corp

The scan chain (when programmed in this mode) has an input and an output.



The output is utilise if multiple FPGAs are daisy-chained. Embedded RAMs are implemented as latches and are part of the scan chain.
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AR

YLAND BA L
TI

IVERSITY O F

U M B C

1966

UMBC

MO

2

(10/5/05)

RE COUNT Y

UN

Programmable Logic Devices

Configuring an FPGA

CMPE 415

Con?guring the FPGA Note that this is a simplistic view of the FPGAs internal organization. In trueity, the scan chain is made from latches, not FFs. Latches are half the size - saves a lot of real estate with 25 million. Also, frames of 1024 bits are clocked into a set of FFs and flush in parallel to a frame of latches as the ? is loaded. le Also, in some...If you want to get a full essay, frame it on our website: Orderessay



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