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参数资料
| 型号： | CDB8420 |
| 厂商： | Cirrus Logic Inc |
| 文件页数： | 43/94页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR CS8420 |
| 标准包装： | 1 |
| 主要目的： | 音频，采样率转换器 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | CS8420 |
| 主要属性： | 带数字音频发射器和接收器的采样率转换器 |
| 次要属性： | 44.1、48、96 kHz 输出采样率，AES/EBU，S/PDIF，EIAJ-340，GUI |
| 已供物品： | 板 |
| 相关产品： | 598-1125-5-ND - IC SAMPLE RATE CONVERTER 28SOIC |
| 其它名称： | 598-1782 |
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48
DS245F4
CS8420
11. SYSTEM AND APPLICATIONS ISSUES
11.1
Reset, Power Down and Start-up Options
When RST is low, the CS8420 enters a low-power mode. All internal states are reset, including the control
port and registers, and the outputs are muted. When RST is high, the control port becomes operational, and
the desired settings should be loaded into the control registers. Writing a 1 to the RUN bit will then cause
the part to leave the low-power state and begin operation. After the PLL and the SRC have settled, the AES3
and serial audio outputs will be enabled.
Some options within the CS8420 are controlled by a start-up mechanism. During the reset state, some of
the output pins are reconfigured internally to be inputs. Immediately upon exiting the reset state, the level
of these pins is sensed. The pins are then switched to be outputs. This mechanism allows output pins to be
used to set alternative modes in the CS8420 by connecting a 47 k
Ω resistor between the pin and either VD+
(High) or DGND (Low). For each mode, every start-up option select pin MUST have an external pull-up or
pull-down resistor. In software mode, the only start-up option pin is EMPH, which is used to set a chip ad-
dress bit for the control port in IC mode. Hardware modes use many start-up options, which are detailed in
the hardware definition section at the end of this data sheet.
11.2
Transmitter Startup
When the CS8420 is taken out of power-down and the AES3 receiver is configured to be in-circuit, the part
uses the clock recovered from the AES3 input stream to advance its internal state machine to run. This can
be a problem if no valid AES3 stream is present at the RXP/RXN pins and data input through the serial audio
port needs to be output through the AES3 transmitter.
To complete initialization and begin operation when the AES3 receiver is in-circuit and no valid AES3 input
stream is presented to the RXP/RXN pins, the user must execute the following sequence:
1.
Place the CS8420 in power-down (RUN = 0).
2.
Set the serial audio input and output ports to Slave mode (SIMS = 0, SOMS = 0).
3.
Set the input and output time base to the OMCK input pin (OUTC = 0, INC = 1).
4.
Configure the SRC to receive its input from the serial audio input port (SRCD = 0).
5.
Configure the serial audio output port to receive its input from the serial audio input port (SPD[1:0] = 01).
6.
Configure the AES3 transmitter to receive its input from the serial audio input port (TXD[1:0] = 01).
7.
Set the RUN bit (RUN = 1).
After completing steps 1-7, the transmitter will function properly, and the data flow can be altered for the
application without powering down.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CDB8421 | 功能描述:音频 IC 开发工具 2-Ch 32-Bit 192kHz sample rate converte RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| CDB8422 | 功能描述:界面开发工具 Eval Bd 192kHz SRC S/PDIF Receiver RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| CDB8427 | 功能描述:音频 IC 开发工具 Eval Bd 96kHz Dig. Audio Transcvr RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| CDB8952 | 制造商:Cirrus Logic 功能描述:NOT RECOMMENDED FOR NEW DESIGNS - USE CDB8952T - Bulk 制造商:Cirrus Logic 功能描述:Tools Development kit Kit Con |
| CDB8952T | 功能描述:以太网开发工具 Eval Bd 100BASE-TX/ 10BASE-T Transceiver RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压: |
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