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DSP56371 Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc |
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DSP56371 Datasheet(HTML) 10 Page - Freescale Semiconductor, Inc |
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10 / 68 page  DSP56371 Data Sheet, Rev. 4.1 Signal/Connection Descriptions Freescale Semiconductor 10 implement the Motorola SPI serial protocol. The ESAI consists of independent transmitter and receiver sections, each with its own clock generator. It is a superset of the DSP56300 family ESSI peripheral and of the DSP56000 family SAI peripheral. For more information on the ESAI, refer to DSP56371 User’s Manual, Enhanced Serial Audio Interface (ESAI) section. 2.5.4 Enhanced Serial Audio Interface 1 (ESAI_1) The ESAI_1 is a second ESAI interface. The ESAI_1 is functionally identical to ESAI. For more information on the ESAI_1, refer to DSP56371 User’s Manual, Enhanced Serial Audio Interface (ESAI_1) section. 2.5.5 Serial Host Interface (SHI) The SHI is a serial input/output interface providing a path for communication and program/coefficient data transfers between the DSP and an external host processor. The SHI can also communicate with other serial peripheral devices. The SHI can interface directly to either of two well-known and widely used synchronous serial buses: the Motorola serial peripheral interface (SPI) bus and the Philips inter-integrated-circuit control (I2C) bus. The SHI supports either the SPI or I2C bus protocol, as required, from a slave or a single-master device. To minimize DSP overhead, the SHI supports single-, double- and triple-byte data transfers. The SHI has a 10-word receive FIFO that permits receiving up to 30 bytes before generating a receive interrupt, reducing the overhead for data reception. For more information on the SHI, refer to DSP56371 User’s Manual, Serial Host Interface section. 2.5.6 Digital Audio Transmitter (DAX) The DAX is a serial audio interface module that outputs digital audio data in the AES/EBU, CP-340 and IEC958 formats. For more information on the DAX, refer to DSP56371 User’s Manual, Digital Audio section. 3 Signal/Connection Descriptions 3.1 Signal Groupings The input and output signals of the DSP56374 are organized into functional groups, which are listed in Table 1. and illustrated in Figure 2. The DSP56374 is operated from a 1.25 V and 3.3 V supply; however, some of the inputs can tolerate 5.0 V. A special notice for this feature is added to the signal descriptions of those inputs. |
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