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read-only memory (rom) is different from random access memory (ram) in that:

来源:LM317 Electronics Components编辑:Sensirion时间:2021-06-14 03:49:25

The pre-divider D (programmable by configuration) reduces the input frequency and feeds one input of the traditional PLL phase comparator. The feedback divider (programmable by configuration) acts as a multiplier because it divides the VCO output frequency before feeding the other input of the phase comparator. D and M must be chosen appropriately to keep the VCO within its controllable frequency range.

The VCO has eight equally spaced outputs (0°(176), 45°(176), 90°(176), 135°(176), 180°(176), 225°(176), 270°(176), and 315°(176)). Each can be selected to drive one of the six output dividers, O0 to O5 (each programmable by configuration to divide by any integer from 1 to 128).

read-only memory (rom) is different from random access memory (ram) in that:

Clock Distribution

Each Spartan-6 FPGA provides abundant clock lines to address the different clocking requirements of high fanout, short propagation delay, and extremely low skew.

Global Clock Lines

read-only memory (rom) is different from random access memory (ram) in that:

In each Spartan-6 FPGA, 16 global-clock lines have the highest fanout and can reach every flip-flop clock. Global clock lines must be driven by global clock buffers, which can also perform glitchless clock multiplexing and the clock enable function. Global clocks are often driven from the CMTs, which can completely eliminate the basic clock distribution delay.

I/O Clocks

read-only memory (rom) is different from random access memory (ram) in that:

I/O clocks are especially fast and serve only the localized input and output delay circuits and the I/O serializer/deserializer (SERDES) circuits, as described in the I/O Logic section.

Block RAM Spartan-6 FPGA Block RAM Resources User Guide

The book is published by Elsevier/Newnes, ISBN 978-1-85617-622-4, copyright 2009, excerpted with permission, all rights reserved.

Major embedded systems tools providers are nowsupporting the Eclipse IDE as a development environment. With so manycommercial rivals involved it is not surprising that there aredisagreements over the approach.

Wind River seems to favour an enhanced version,tailored to the task of embedded code development and debug, whileothers are happy to leave Eclipse to the supporting committees and keepto a single freely available version.

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