Cmedia 6571 codecs are intel 8051 based codecs and have firmware on them to handle the usb protocol, i have another usb codecs which are plantronics, they have no problem when i use them 8khz and 8 bit, but when i use them as 16 bit and 48khz, the bandwidth problem occurs again.
On 4 Aug 2014 22:33, "Vladimir Mosgalin" <mosgalin@xxxxxxxxxxxxxxx> wrote:
Hi Ralf Mardorf!
On 2014.08.04 at 19:05:37 +0200, Ralf Mardorf wrote next:
> On Mon, 2014-08-04 at 19:53 +0300, Burak METİN wrote:
> > When i use these cards with different usb buses, it is ok but i need
> > to use them in same bus.
>
> IIRC the plug'n'play audio USB driver is limited to USB1, for USB2
> proprietary drivers are needed. But perhaps I'm confusing something.
> Assumed I shouldn't be mistaken, then perhaps the bandwidth really is to
> small.
Can't be true.. Here is example of USB 2.0 audio device (bcdUSB: 2.00),
completely plug and play:
Bus 002 Device 005: ID 20b1:0002 XMOS Ltd
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2 ?
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x20b1 XMOS Ltd
idProduct 0x0002
bcdDevice 3.30
iManufacturer 1 XMOS
iProduct 2 XMOS USB Audio 2.0
iSerial 3 0000
bNumConfigurations 2
--
Vladimir
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