Yannick Bornat - Teaching resources

Cette page est en lecture seule. Vous pouvez afficher le texte source, mais ne pourrez pas le modifier. Contactez votre administrateur si vous pensez qu'il s'agit d'une erreur.

====== MEMS microphone controler ======

This module controls the MEMS microphone embedded on the Nexys4 board and outputs its data

{{ :en202:mems_microphone_symbol.png?direct&600 |}}
({{:en202:mems_microphone_symbol.vsd | figure source}})

==== Using this module ====

Just configure the generic values and enjoy the sample on //data_out// when //data_en// = '1'. //data_en// is set at the //SAMPL_FREQ// frequency on average. If //SAMPL_FREQ// is not a divider of //CLK_FREQ_HZ//, the exact period between two samples is subject to 1 clock cycle variation from time to time.

No asumptions should be made on the value of //data_out// when //data_en// is not set.

=== Module generics ===

  * **//CLK_FREQ_HZ//** : The system clock frequency expressed in Hz. It is used to provide an accurante sampling frequency.
  * **//OUT_BITS//** : The number of bits to express the sample value. The higher this number, the lower the maximum frequency. This value can range from 6 to allow high sampling rate, to 10 to improve sample precision
  * **//SAMPL_FREQ//** : The desired audio sampling frequency. This value is limited by the precision of the samples.

=== Module Files ===

{{ en202:mems_microphone.vhd | module file}}