Using opencores I2S as master

Sorry for the cross postings but I really need help.

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