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Message
From: cbr_929rr at hotmail.com<cbr_929rr@h...>
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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