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SAF7741 数据表(PDF) 40 Page - NXP Semiconductors |
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SAF7741 数据表(HTML) 40 Page - NXP Semiconductors |
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40 / 83 page  SAF7741_5 © NXP B.V. 2008. All rights reserved. Objective data sheet Rev. 05 — 09 May 2008 40 of 83 NXP Semiconductors SAF7741HV Dual IF car radio and audio DSP (N1F) and the actual contained bandwidth of the audio information. Any product derivative with a fixed SDSP ROM code will have clear restrictions. The code for the SAF7741HV platform can be chosen for different implementations. 7.5 Host I2S I/O A HOST I2S interface is available that features five inputs and four outputs. Configuration of the HOST I2S interface can be done via the I2C registers . Details can be found in Ref. 3. 7.6 ADSP The ADSP processes audio features on five stereo audio channels coming from the SDSP, two stereo channels and one mono channel from the ADCs and eight stereo HOST inputs. In addition to this the ADSP can be used to sample-rate convert one additional stereo input to the same reference sample rate as all the other inputs. On the output side there are eight to 10 HOST outputs. The ADSP will control the switches in SwitchBox2 of the SDSP and SwitchBox1 in front of the ADC. 7.6.1 ADSP user flags Eight user flags can be used to control several settings in the ADSP. The stretch mode as well as I/O direction of those flags is user-definable. Furthermore, there are two flags that are used as sample indicators for the SRC software and two flags that support an interface towards the TDSP1E in the radio subsystem (fixed input flags). Finally there is one flag that is connected to the WDOG status register. When this is used it must be configured as an output. The table below shows the function of each flag. Table 17. Examples of the most common SPDIF sample frequencies Sample frequency (kHz) Data rate (Mbits) Channel rate (Mbits) 44.1 2.8224 5.6448 48.0 3.0720 6.1440 32.0 2.0480 4.0960 Table 18. ADSP user flags Pin name Flag Function Mode [1] I/O Stretch − F0 Internal divided sample rate flag (pflag) IN OFF − F1 Internal source sample rate flag IN ON − F2 ADSP TDSP1E interface IN OFF − F3 ADSP TDSP1E interface IN OFF ADSP_IOF4 F4 User-defined input or output IN/OUT ON/OFF ADSP_IOF5 F5 User-defined input or output IN/OUT ON/OFF ADSP_IOF6 F6 User-defined input or output IN/OUT ON/OFF ADSP_IOF7 F7 User-defined input or output IN/OUT ON/OFF ADSP_IOF8 F8 User-defined input or output IN/OUT ON/OFF ADSP_IOF9 F9 User-defined input or output IN/OUT ON/OFF |
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