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PCM2901EG4 Datasheet(PDF) 23 Page - Texas Instruments |
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PCM2901EG4 Datasheet(HTML) 23 Page - Texas Instruments |
23 / 37 page ![]() www.ti.com Interface #2 Interface #3 End-Points PCM2901 PCM2903 SLES034C – MARCH 2002 – REVISED NOVEMBER 2007 Interface #2 is defined as the audio streaming data-in interface. Interface #2 has the following 19 alternative settings. Alternative setting #0 is the zero-bandwidth setting. All other alternative settings are operational settings. ALTERNATIVE SAMPLING RATE DATA FORMAT TRANSFER MODE SETTING (kHz) 00 Zero bandwidth 01 16 bit Stereo 2s complement (PCM) Asynchronous 48 02 16 bit Mono 2s complement (PCM) Asynchronous 48 03 16 bit Stereo 2s complement (PCM) Asynchronous 44.1 04 16 bit Mono 2s complement (PCM) Asynchronous 44.1 05 16 bit Stereo 2s complement (PCM) Asynchronous 32 06 16 bit Mono 2s complement (PCM) Asynchronous 32 07 16 bit Stereo 2s complement (PCM) Asynchronous 22.05 08 16 bit Mono 2s complement (PCM) Asynchronous 22.05 09 16 bit Stereo 2s complement (PCM) Asynchronous 16 0A 16 bit Mono 2s complement (PCM) Asynchronous 16 0B 8 bit Stereo 2s complement (PCM) Asynchronous 16 0C 8 bit Mono 2s complement (PCM) Asynchronous 16 0D 8 bit Stereo 2s complement (PCM) Asynchronous 8 0E 8 bit Mono 2s complement (PCM) Asynchronous 8 0F 16 bit Stereo 2s complement (PCM) Synchronous 11.025 10 16 bit Mono 2s complement (PCM) Synchronous 11.025 11 8 bit Stereo 2s complement (PCM) Synchronous 11.025 12 8 bit Mono 2s complement (PCM) Synchronous 11.025 Interface #3 is defined as the interrupt data-in interface. Alternative setting #0 is the only possible setting for interface #3. Interface #3 constructs the HID consumer control device. Interface #3 reports the following three key statuses. • Mute (0xE209) • Volume up (0xE909) • Volume down (0xEA09) The PCM2901/2903 has the following four end-points. • Control end-point (EP #0) • Isochronous-out audio data stream end-point (EP #2) • Isochronous-in audio data stream end-point (EP #4) • HID end-point (EP #5) The control end-point is a default end-point. The control end-point is used to control all functions of the PCM2901/2903 by the standard USB request and USB audio-class-specific request from the host. The isochronous-out audio data stream end-point is an audio sink end-point, which receives the PCM audio data. The isochronous-out audio data stream end-point accepts the adaptive transfer mode. The isochronous-in audio data stream end-point is an audio source end-point, which transmits the PCM audio data. The isochronous-in audio data stream end-point uses asynchronous transfer mode. The HID end-point is an interrupt-in end-point. HID end-point reports HID0, HID1, and HID2 pin status every 32 ms. The human interface device (HID) pins are defined as consumer control devices. The HID function is designed as an independent end-point from both isochronous-in and -out end-points. This means that the device affected by the HID operation depends on the host software. Typically, the HID function affects the primary audio-out device. Copyright © 2002–2007, Texas Instruments Incorporated Submit Documentation Feedback 23 Product Folder Link(s): PCM2901 PCM2903 |
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