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ADSP-21364KBCZ-1AA 数据表(PDF) 7 Page - Analog Devices |
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ADSP-21364KBCZ-1AA 数据表(HTML) 7 Page - Analog Devices |
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7 / 56 page  ADSP-21362/ADSP-21363/ADSP-21364/ADSP-21365/ADSP-21366 Rev. G | Page 7 of 56 | March 2011 generate either center-aligned or edge-aligned PWM wave- forms. In addition, it can generate complementary signals on two outputs in paired mode or independent signals in non- paired mode (applicable to a single group of four PWM waveforms). The PWM generator is capable of operating in two distinct modes while generating center-aligned PWM waveforms: single update mode or double update mode. In single update mode, the duty cycle values are programmable only once per PWM period. This results in PWM patterns that are symmetrical about the midpoint of the PWM period. In double update mode, a second updating of the PWM registers is implemented at the midpoint of the PWM period. In this mode, it is possible to produce asymmetrical PWM patterns that produce lower harmonic distortion in 3-phase PWM inverters. Digital Audio Interface (DAI) The digital audio interface (DAI) provides the ability to connect various peripherals to any of the DSP’s DAI pins (DAI_P20–1). Programs make these connections using the signal routing unit (SRU, shown in Figure 1). The SRU is a matrix routing unit (or group of multiplexers) that enables the peripherals provided by the DAI to be intercon- nected under software control. This allows easy use of the DAI-associated peripherals for a wider variety of applications by using a larger set of algorithms than is possible with nonconfig- urable signal paths. The DAI includes six serial ports, an S/PDIF receiver/transmit- ter, a DTCP cipher, a precision clock generator (PCG), eight channels of asynchronous sample rate converters, an input data port (IDP), an SPI port, six flag outputs and six flag inputs, and three timers. The IDP provides an additional input path to the ADSP-2136x core, configurable as either eight channels of I2S serial data or as seven channels plus a single 20-bit wide syn- chronous parallel data acquisition port. Each data channel has its own DMA channel that is independent from the processor’s serial ports. Serial Ports The processor features six synchronous serial ports that provide an inexpensive interface to a wide variety of digital and mixed- signal peripheral devices such as Analog Devices’ AD183x fam- ily of audio codecs, ADCs, and DACs. The serial ports are made up of two data lines, a clock, and a frame sync. The data lines can be programmed to either transmit or receive and each data line has a dedicated DMA channel. Serial ports are enabled via 12 programmable and simultaneous receive or transmit pins that support up to 24 transmit or 24 receive channels of audio data when all six SPORTs are enabled, or six full duplex TDM streams of 128 channels per frame. Serial port data can be automatically transferred to and from on-chip memory via dedicated DMA channels. Each of the serial ports can work in conjunction with another serial port to provide TDM support. One SPORT provides two transmit sig- nals while the other SPORT provides the two receive signals. The frame sync and clock are shared. Serial ports operate in four modes: • Standard DSP serial mode •Multichannel (TDM) mode •I2S mode • Left-justified sample pair mode S/PDIF-Compatible Digital Audio Receiver/Transmitter The S/PDIF transmitter has no separate DMA channels. It receives audio data in serial format and converts it into a biphase encoded signal. The serial data input to the transmitter can be formatted as left-justified, I2S, or right-justified with word widths of 16, 18, 20, or 24 bits. The serial data, clock, and frame sync inputs to the S/PDIF transmitter are routed through the signal routing unit (SRU). They can come from a variety of sources such as the SPORTs, external pins, the precision clock generators (PCGs), or the sample rate converters (SRC) and are controlled by the SRU control registers. Digital Transmission Content Protection (DTCP) The DTCP specification defines a cryptographic protocol for protecting audio entertainment content from illegal copying, intercepting, and tampering as it traverses high performance digital buses, such as the IEEE 1394 standard. Only legitimate entertainment content delivered to a source device via another approved copy protection system (such as the DVD content scrambling system) is protected by this copy protection system. This feature is available on the ADSP-21362 and ADSP-21365 processors only. Licensing through DTLA is required for these products. Visit www.dtcp.com for more information. Memory-to-Memory (MTM) If the DTCP module is not used, the memory-to-memory DMA module allows internal memory copies for a standard DMA. Synchronous/Asynchronous Sample Rate Converter (SRC) The sample rate converter (SRC) contains four SRC blocks and is the same core as that used in the AD1896 192 kHz stereo asynchronous sample rate converter and provides up to 140 dB SNR. The SRC block is used to perform synchronous or asynchronous sample rate conversion across independent stereo channels, without using internal processor resources. The four SRC blocks can also be configured to operate together to con- vert multichannel audio data without phase mismatches. Finally, the SRC is used to clean up audio data from jittery clock sources such as the S/PDIF receiver. The S/PDIF and SRC are not available on the ADSP-21363 models. Input Data Port (IDP) The IDP provides up to eight serial input channels—each with its own clock, frame sync, and data inputs. The eight channels are automatically multiplexed into a single 32-bit by eight-deep FIFO. Data is always formatted as a 64-bit frame and divided into two 32-bit words. The serial protocol is designed to receive |
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类似说明 - ADSP-21364KBCZ-1AA |
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