Xilinx Pico Blaze Frequency Generator Скачать руководство пользователя страница 2

Frequency Generator for the Spartan-3E Starter Kit 2

Limited Warranty and Disclaimer. These designs are provided to you “as is”. Xilinx and its licensors make and you receive no 

warranties or conditions, express, implied, statutory or otherwise, and Xilinx specifically disclaims any implied warranties of 

merchantability, non-infringement, or fitness for a particular purpose. Xilinx does not warrant that the functions contained in these 

designs will meet your requirements, or that the operation of these designs will be uninterrupted or error free, or that defects in 

the Designs will be corrected. Furthermore, Xilinx does not warrant or make any representations regarding use or the results of 

the use of the designs in terms of correctness, accuracy, reliability, or otherwise.

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substitute goods or services, or for any special, incidental, consequential, or indirect damages arising from the use or operation 

of the designs or accompanying documentation, however caused and on any theory of liability. This limitation will apply even if 

Xilinx has been advised of the possibility of such damage. This limitation shall apply not-withstanding the failure of the essential 

purpose of any limited remedies herein.

This design module is not supported by general Xilinx Technical support as an official Xilinx Product.

Please refer any issues initially to the provider of the module.

Any problems or items felt of value in the continued improvement of KCPSM3 or this reference design would be gratefully 

received by the author.

Ken Chapman

Senior Staff Engineer – Spartan Applications Specialist

email: [email protected]

Limitations

The author would also be pleased to hear from anyone using KCPSM3 with information about your application and PicoBlaze 

has been useful.

Содержание Pico Blaze Frequency Generator

Страница 1: ...Frequency Generator for Spartan 3E Starter Kit Ken Chapman Xilinx Ltd 18th July 2006 Rev 1 With special thanks to Peter Alfke and Alireza Kaviani...

Страница 2: ...iable for any loss of data lost profits cost or procurement of substitute goods or services or for any special incidental consequential or indirect damages arising from the use or operation of the des...

Страница 3: ...to the hardware which means that you can use this design with your board to determine the exact values required to implement a fixed frequency synthesizer without requiring PicoBlaze the knob and LCD...

Страница 4: ...ck line under the digit in the top line Edit digit value mode Press and release knob to toggle between frequency editing modes Edit cursor position mode In this mode rotating the knob to the left or r...

Страница 5: ...frequency version Number of occupied Slices 172 out of 4 656 3 Number of Block RAMs 1 out of 20 5 DCMs 2 out of 4 50 Total equivalent gate count for design 91 537 PicoBlaze makes extensive use of the...

Страница 6: ...included with the reference design as it is provided with PicoBlaze download Please visit the PicoBlaze Web site for your free copy of PicoBlaze assembler JTAG_loader and documentation www xilinx com...

Страница 7: ...ecimal so the output from the phase accumulator is 9 5MHz a period of approximately 105ns That means that the accumulator synthesizes one output cycle for approximately 21 cycles of the 200MHz clock f...

Страница 8: ...led 3 led 2 led 1 led 0 led 7 output_ports rotary_a rotary_press rotary_b lcd_rs lcd_e lcd_rw lcd 7 6 lcd 6 lcd 5 lcd 4 lcd 7 lcd 6 lcd 5 lcd 4 bidirectional LCD data rotary_press_in See reference de...

Страница 9: ...cycles 200MHz 8 cycles 200MHz This waveform shows what happens when you try to synthesize a 12 4125MHz clock using the phase accumulator There is clearly 5ns of cycle to cycle jitter in this situatio...

Страница 10: ...ynthesis process and this is reflected by a distinct 12 5MHz component which is 45dB above the noise floor The zoomed plot shows how the fundamental covers only a narrow bandwidth keeping in mind that...

Страница 11: ...mode you must accept that it does NOT maintain phase lock as it does in all other normal modes More significantly the output frequency is the average of the input frequency which means there will oft...

Страница 12: ...tay balanced because we are unable to freeze completely due to other influences on us and the need to breath etc 12 5MHz Fundamental 5MHz division 10dB division 1MHz division 10dB division 3rd Harmoni...

Страница 13: ...mming File Then right click and select Properties to open the Process Properties box 2 The Process Properties box should open with the General Options being shown otherwise select General Options on t...

Страница 14: ...frequencies you require then reduce the design to a phase accumulator driven by a constant N the DCMs and a fixed counter divider no multiplexer Hint If you still operate the phase accumulator at 200...

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