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参数资料
| 型号： | DS2164Q |
| 英文描述： | G.726 ADPCM Processor |
| 中文描述： | G.726 ADPCM处理器 |
| 文件页数： | 2/17页 |
| 文件大小： | 259K |
| 代理商： | DS2164Q |
DS2164Q
2 of 17
OVERVIEW
The DS2164Q contains three major functional blocks: a high performance (10 MIPS) DSP engine, two
independent PCM interfaces (X and Y) that connect directly to serial time-division-multiplexed (TDM)
backplanes, and a serial port that can configure the device on-the-fly by an external controller. A 10MHz
master clock is required by the DSP engine. The DS2164Q can be configured to perform either two
expansions, two compressions, or one expansion and one compression. The PCM/ADPCM data interfaces
support data rates from 256kHz to 4.096MHz. Typically, the PCM data rates are 1.544MHz for -law and
2.048MHz for A-law. Each channel on the device samples the serial input PCM or ADPCM bit stream
during a user-programmed input time slot, processes the data and outputs the result during a user-
programmed output time slot.
Each PCM interface has a control register that specifies functional characteristics (compress, expand,
bypass, and idle), data format ( -law or A-law), and algorithm reset control. With the SPS pin strapped
high, the software mode is enabled and the serial port can be used to configure the device. In this mode, a
novel addressing scheme allows multiple devices to share a common 3-wire control bus, simplifying
system-level interconnect.
With SPS low, the hardware mode is enabled. This mode disables the serial port and maps certain control
register bits to some of the address and serial port pins. Under the hardware mode, no external host
controller is required and all PCM/ADPCM input and output time slots default to time slot 0.
HARDWARE RESET
RST
allows the user to reset both channel algorithms and the contents of the internal registers. This pin
must be held low for at least 1ms on system power-up after the master clock is stable to ensure that the
device has initialized properly.
RST
should also be asserted when changing to or from the hardware
mode.
RST
clears all bits of the control register for both channels except the IPD bits; the IPD bits for
both channels are set to 1.
SOFTWARE MODE
Connecting SPS high enables the software mode. In this mode, an external host controller writes
configuration data to the DS2164Q by the serial port through inputs SCLK, SDI, and
CS
(Figure 2). Each
write to the DS2164Q is either a 2-byte write or a 4-byte write. A 2-byte write consists of the
address/command byte (ACB), followed by a byte to configure the control register (CR) for either the X
or Y channel. The 4-byte write consists of the ACB, followed by a byte to configure the CR, and then 1
byte to set the input time slot and another byte to set the output time slot.
ADDRESS/COMMAND BYTE
In the software mode, the address/command byte is the first byte written to the serial port; it identifies
which of the 64 possible ADPCM processors sharing the port wiring is to be updated. Address data must
match that at inputs A0 to A5. If no match occurs, the device ignores the following configuration data. If
an address match occurs, the next 3 bytes written are accepted as control, input and output time slot data.
Bit ACB.6 determines which side (X or Y) of the device is to be updated. The PCM and ADPCM outputs
are tri-stated during register updates.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2164Q/T&R | 制造商:Maxim Integrated Products 功能描述:ADPCM PROCESSOR 28PIN PLCC T&R - Tape and Reel |
| DS2164Q/T&R+ | 制造商:Maxim Integrated Products 功能描述:ADPCM PROCESSOR 28P PLCC T&R LF - Tape and Reel |
| DS2164Q/T&R | 功能描述:数字信号处理器和控制器 - DSP, DSC RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT |
| DS2164Q+ | 功能描述:数字信号处理器和控制器 - DSP, DSC RoHS:否 制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT |
| DS2164Q+T&R | 制造商:Maxim Integrated Products 功能描述:ADPCM PROCESSOR 28PLCC - Tape and Reel |
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