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Using I2S Master
by Unknown on Oct 19, 2006 |
Not available! | ||
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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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Using I2S Master
by Unknown on Oct 25, 2006 |
Not available! | ||
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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.comcbr_929rr at 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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Using I2S Master
by Unknown on Oct 28, 2006 |
Not available! | ||
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I changed the conf ratio to "00001011", bypassed the WB_interface and
it started working.
The ACLK and LRCLK seemed to be what I expected. However, the SCLK
was not.
I used a FIFO to latch the data and read it out based on ACLK.
Thanks.
Cbr
----- Original Message -----
From: cbr_929rr at hotmail.comcbr_929rr at h...>
To:
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
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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