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Message
From: cbr_929rr at hotmail.com<cbr_929rr@h...>
Date: Wed Oct 25 01:52:50 CEST 2006
Subject: [oc] Using I2S Master
I know that there are atleast a few in this group who have used this
core and know how to configure it.
Can anyone be kind enough to help me out?
Thanks,
Cbr
----- Original Message -----
From: cbr_929rr at hotmail.com<cbr_929rr@h...>
To:
Date: Thu Oct 19 06:18:42 CEST 2006
Subject: [oc] Using I2S Master
> I'm trying to use the Opencores I2S master logic as the driver for
> my
> test platform to generate test audio signals.
> The core came configured with SCK = 2.77 MHz and WS(left/right
> clock)=
> 69.44 KHz.
> I would like to be able to reconfigure the core to generate
> SCK=3.07MHz
> and WS=48 KHz.
> I played around with the conf variable but could not get the ratio
> I'm
> looking for.
> I read the documentation but I still cannot understand. An
> explanation
> would certainly help.
> According to the manual,
> The sample rate is given by bit_rate/(RES * 2)
> If I choose the sample rate to be 48 KHz, and the resolution is
> 20-bits,
> the bit rate would be 1.92 Mbps.
> However, the RATIO would then be calculated as follows.
> RATIO= (wishbone_bus_clock - (sample_rate * RES * 8)) /
> (sample_rate * RES * 4)
> wishbone_bus_clock= 50 MHz
> sample rate = 48 KHz
> RES=20 bits
> which would then be equal to ~22 (10110)
> This is not giving me the values of 48KHz for WS and 3.072 MHz for
> i2s_sck.
> Could you please help?
> Thanks,
> cbr
>
>
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