Conexant CX2388x

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Big brother to the [[BT878]] produced by [[Conexant Systems, Inc.]]. Has specialised DVB support in a new PCI function, instead of using the digital audio input for it. (Yay!). In fact it has stacks of functions, like 6 or something, but fortunately they all share the same (huge 16MB!) memory mapping. Has the same (identical?) RISC programs as the BT878 and the same kind of [[I2c_Protocol|i2c bus control]] controller.
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A [[PCI interface chipsets|PCI interface chipset]] family of ICs from [[Conexant]]. The CX2388x (CX23880, CX23881, CX23882, CX23883) family are the direct successors to the [[Conexant Fusion 878A|Fusion 878A]] chip.
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Note that according to the [http://www.conexant.com/servlets/DownloadServlet/PBR-200192-001.pdf?docid=193&revid=1 product brief], the maximum video signal that this chip can capture is "up to 768 x 576 (square pixel PAL/SECAM)", that is 576p.  No true HD signals (720i, 720p, 1080i) can be captured with cards using this chipset.  Some countries, such as Australia, have defined HD to be 576p or above, but 576p is not generally considered HD.
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The CX2388x chips are supported under Linux, by the [[cx88|cx88 and associated kernel driver modules]], however, there are areas of these chips' feature sets that the drivers currently lack support for or either need improvement upon.  
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But really for DVB I don't think it gives you anything that the BT878 doesn't. If however you want to put analogue video on the same card (like [[DViCO]] do) then it seems to have a few improvements in that department.
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{{Note|Take care not to confuse this IC family with the similarly named [[Conexant CX23885/7/8]] PCIe based family of ICs}}
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====Analog audio inputs====
 
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The cx2388x family of ICs are capable of providing demodulation of all major global broadcast audio standards.  In other words, they can directly accept S-IF from a TV tuner pll. These signals will in turn be decoded and are output either to the PC's sound card directly via a patch cable (invokes a DAC step), to a digital audio output interface (eg. SPDIF), or to the host via a DMA channel.
 
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The cx2388x IC's do not process other analog audio sources.  They do, however, provide the ability to connect directly, via an i2s input port, to a 3rd party audio ADC.
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==Overview/Features==
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These chips provide a/v decoder functionality and have dedicated DVB support in a new PCI function, as opposed to the hackish approach employed by its predecessor, the 878A; which provided DVB support via use of the chip's digital audio input lines.
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In fact, the CX2388x chips have 6 (?) PCI functions, but fortunately they all share the same (huge 16MB!) memory mapping. Executing the command ''lspci'' will reveal in it's output that the cx2388x has the following ports:
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00:09.0 Multimedia video controller: Conexant CX23880/1/2/3 PCI Video and Audio Decoder (rev 05)
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00:09.1 Multimedia controller: Conexant CX23880/1/2/3 PCI Video and Audio Decoder [Audio Port] (rev 05)
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00:09.2 Multimedia controller: Conexant CX23880/1/2/3 PCI Video and Audio Decoder [MPEG Port] (rev 05)
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00:09.4 Multimedia controller: Conexant CX23880/1/2/3 PCI Video and Audio Decoder [IR Port] (rev 05)
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The chips have the same (identical?) RISC programs as the Bt878 and the same kind of [[I²C Protocol|I²C bus control]] controller.
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==Analog Functions==
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====Analog video inputs====
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In terms of its analog to digital signal processing capabilities, the cx2388x brings some improvements over the older [[Conexant Fusion 878A|Fusion 878A]] chipset.
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Like many other contemporary mainstream A/V decoders, the maximum capture window that these chips support is "up to 768 x 576 (square pixel PAL/SECAM)".
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====Analog audio inputs====
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The cx2388x family of ICs are capable of providing demodulation of all major global '''broadcast audio''' standards.  In other words, they can directly accept S-IF from a TV tuner pll. These signals will in turn be decoded and are output either to the PC's sound card directly via a patch cable (invokes a DAC step), to a digital audio output interface (eg. SPDIF), or to the host via a DMA channel.
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The cx2388x IC's do NOT process other analog audio sources.  They do, however, provide the ability to connect directly, via an i2s input port, to a 3rd party audio ADC.
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Also see v4l's [http://www.linuxtv.org/v4lwiki/index.php/Cx88_devices_%28cx2388x%29 cx88 page]
 
== External Links ==
== External Links ==
* [http://www.conexant.com/products/entry.jsp?id=107 Conexant cx2388x product page]
* [http://www.conexant.com/products/entry.jsp?id=107 Conexant cx2388x product page]
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** [http://www.conexant.com/servlets/DownloadServlet/PBR-200192-001.pdf?docid=193&revid=1 Spec Sheet. ]
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[[Category:Decoder]]
 
[[Category:Hardware]]
[[Category:Hardware]]
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[[Category:Chipsets]]
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[[Category:Decoder]]

Latest revision as of 20:15, 21 January 2012

A PCI interface chipset family of ICs from Conexant. The CX2388x (CX23880, CX23881, CX23882, CX23883) family are the direct successors to the Fusion 878A chip.

The CX2388x chips are supported under Linux, by the cx88 and associated kernel driver modules, however, there are areas of these chips' feature sets that the drivers currently lack support for or either need improvement upon.

Note: Take care not to confuse this IC family with the similarly named Conexant CX23885/7/8 PCIe based family of ICs


Contents

Overview/Features

These chips provide a/v decoder functionality and have dedicated DVB support in a new PCI function, as opposed to the hackish approach employed by its predecessor, the 878A; which provided DVB support via use of the chip's digital audio input lines.

In fact, the CX2388x chips have 6 (?) PCI functions, but fortunately they all share the same (huge 16MB!) memory mapping. Executing the command lspci will reveal in it's output that the cx2388x has the following ports:

00:09.0 Multimedia video controller: Conexant CX23880/1/2/3 PCI Video and Audio Decoder (rev 05)
00:09.1 Multimedia controller: Conexant CX23880/1/2/3 PCI Video and Audio Decoder [Audio Port] (rev 05)
00:09.2 Multimedia controller: Conexant CX23880/1/2/3 PCI Video and Audio Decoder [MPEG Port] (rev 05)
00:09.4 Multimedia controller: Conexant CX23880/1/2/3 PCI Video and Audio Decoder [IR Port] (rev 05)

The chips have the same (identical?) RISC programs as the Bt878 and the same kind of I²C bus control controller.

Analog Functions

Analog video inputs

In terms of its analog to digital signal processing capabilities, the cx2388x brings some improvements over the older Fusion 878A chipset.

Like many other contemporary mainstream A/V decoders, the maximum capture window that these chips support is "up to 768 x 576 (square pixel PAL/SECAM)".

Analog audio inputs

The cx2388x family of ICs are capable of providing demodulation of all major global broadcast audio standards. In other words, they can directly accept S-IF from a TV tuner pll. These signals will in turn be decoded and are output either to the PC's sound card directly via a patch cable (invokes a DAC step), to a digital audio output interface (eg. SPDIF), or to the host via a DMA channel.

The cx2388x IC's do NOT process other analog audio sources. They do, however, provide the ability to connect directly, via an i2s input port, to a 3rd party audio ADC.


External Links

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