Conexant CX2388x

Big brother to the Fusion 878A 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 bus control controller.

For DVB signal reception handling, the cx2388x doesn't really offer anything over the older Fusion 878A chipset.

Executing lspci will reveal 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)

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 other A/V decoders, the maximum capture window that these chips support is "up to 768 x 576 (square pixel PAL/SECAM)" i.e. not full HD 1080i/p signals.

See Spec Sheet.

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.

Also see v4l's cx88 page

External Links

• Conexant cx2388x product page