AC'97

(redirected from AC '97)

AC'97

(Audio Codec'97) A specification for audio and modem circuits on a PC motherboard. Introduced in 1996 by Intel, AC'97 provides six channels (5.1) of 20-bit, 48 kHz audio. It supports one audio stream per system and a two-element array microphone.

AC Link
AC'97 comprises a controller connected to analog/digital codecs by a 5-wire TDM interface called "AC Link." The two subsystems separate the digital controller, which is built into the PC chipset, from the analog circuits, which can be in a chip on the motherboard, in an interchangeable riser card or cabled close to the I/O connectors. For international certification (homologation), modem codecs are often placed on riser cards. See HD Audio and riser card.
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These include an integrated LCD controller for direct connection to a display, a PCMCIA interface, Bluetooth UART, baseband/multimedia interface, USB 2.0 'On the Go' interface, memory stick controller, MMC/SD/SDIC interface, 12S and AC '97 interfaces, three SSP and three asynch serial interfaces, keypad interface, GPIO and four PWM interfaces.
The TRITON-270 uses a 200-pin SODIMM connector to bring out all PXA270's internal signals, including: integrated LCD controller for direct connection to a display; a PCMCIA interface; Bluetooth UART; Baseband/Multimedia interface; USB 2.0 interface; Memory Stick controller; MMC/SD/SDIC interface; I2S and AC '97 interfaces; three SSP and three Asynch serial interfaces; keypad interface; GPIO and four PWM interfaces, the company claims.
The 4155 also features three high-speed USB 2.0 ports, an IEEE 1394 port, S-video outlet, 15-pin VGA port, audio outlet, Type II PC card/cardbus slot and is AC '97 v2.1 compliant.
(Nasdaq:CRUS), Fremont, Calif., a supplier of PC audio chip solutions, has introduced a new multi-channel AC '97 compliant PC audio codec that is capable of significantly improving the end-user's PC gaming and musical experience.
The highly-integrated CS4294 is the newest member of Cirrus Logic's Crystal(R) mixed-signal, AC '97 audio codec family of advanced PCI audio products.
"As the sound card industry transitions to four or more channels, manufacturers are demanding multi-channel, low-cost, high-performance AC '97 codecs," said Scott McDonald, vice president and general manager of Cirrus Logic's Crystal Audio Division.
"Our new AC '97 codec leverages our world-class engineering and software expertise to deliver a highly-integrated solution that satisfies the manufacturers' cost parameters and exceeds their performance requirements."
The CS4294 is a single-chip AC '97 codec that combines two A/D channels, stereo mixing for three stereo inputs, a microphone pre-amp and mono microphone input with four 18-bit D/A channels.
With one of the industry's broadest PC audio product lines, Cirrus Logic can provide unmatched ISA, PCI and AC '97 codec performance to the desktop, portable and add-in card markets.
All of these combined solutions meet Microsoft's PC98 and Intel's AC '97 requirements and provide compatibility for legacy games.
Other functions supported by the 815E include DRAM control, PCI bus arbitration logic and interface, high-performance PCI, USB interface, RTC, VN-RAM, AC '97 Codec for sound, standard PC timers, Ultra DMA and interrupt logic.
Onboard features include an integrated high performance graphics controller, a 10 Base-T/100 Base-TX Ethernet auto-negotiating controller, dual channel PCI Ultra DMA/100 IDE interfaces, as well as USB 2.0 ports, serial parallel ports, floppy interface, IrDA interface and AC '97 audio.