参数资料
型号: MSC7112VF1000
厂商: Freescale Semiconductor
文件页数: 40/56页
文件大小: 0K
描述: DSP 16BIT W/DDR CTRLR 400-MAPBGA
标准包装: 90
系列: StarCore
类型: SC1400 内核
接口: 主机接口,I²C,UART
时钟速率: 266MHz
非易失内存: 外部
芯片上RAM: 208kB
电压 - 输入/输出: 3.30V
电压 - 核心: 1.20V
工作温度: -40°C ~ 105°C
安装类型: 表面贴装
封装/外壳: 400-LFBGA
供应商设备封装: 400-MAPBGA(17x17)
包装: 托盘
Hardware Design Considerations
MSC7112 Low-Cost 16-bit DSP with DDR Controller Data Sheet, Rev. 11
Freescale Semiconductor
45
3.2.3
Power Planes
Each power supply pin (VDDC, VDDM, and VDDIO) should have a low-impedance path to the board power supply. Each GND pin
should be provided with a low-impedance path to ground. The power supply pins drive distinct groups of logic on the device.
The MSC7112 VDDC power supply pins should be bypassed to ground using decoupling capacitors. The capacitor leads and
associated printed circuit traces connecting to device power pins and GND should be kept to less than half an inch per capacitor
lead. A minimum four-layer board that employs two inner layers as power and GND planes is recommended. See Section 3.5
for DDR Controller power guidelines.
3.2.4
Decoupling
Both the I/O voltage and core voltage should be decoupled for switching noise. For I/O decoupling, use standard capacitor
values of 0.01
μF for every two to three voltage pins. For core voltage decoupling, use two levels of decoupling. The first level
should consist of a 0.01 F high frequency capacitor with low effective series resistance (ESR) and effective series inductance
(ESL) for every two to three voltage pins. The second decoupling level should consist of two bulk/tantalum decoupling
capacitors, one 10
μF and one 47 μF, (with low ESR and ESL) mounted as closely as possible to the MSC7112 voltage pins.
Additionally, the maximum drop between the power supply and the DSP device should be 15 mV at 1 A.
3.2.5
PLL Power Supply Filtering
The MSC7112 VDDPLL power signal provides power to the clock generation PLL. To ensure stability of the internal clock, the
power supplied to this pin should be filtered with capacitors that have low and high frequency filtering characteristics. VDDPLL
can be connected to VDDC through a 2 Ω resistor. VSSPLL can be tied directly to the GND plane. A circuit similar to the one
shown in Figure 31 is recommended. The PLL loop filter should be placed as closely as possible to the VDDPLL pin (which are
located on the outside edge of the silicon package) to minimize noise coupled from nearby circuits.The 0.01 F capacitor should
be closest to VDDPLL, followed by the 0.1 F capacitor, the 10 F capacitor, and finally the 2-Ω resistor to VDDC. These traces
should be kept short.
3.2.6
Power Consumption
You can reduce power consumption in your design by controlling the power consumption of the following regions of the device:
Extended core. Use the SC1400 Stop and Wait modes by issuing a stop or wait instruction.
Clock synthesis module. Disable the PLL, timer, watchdog, or DDR clocks or disable the CLKO pin.
AHB subsystem. Freeze or shut down the AHB subsystem using the GPSCTL[XBR_HRQ] bit.
Peripheral subsystem. Halt the individual on-device peripherals such as the DDR memory controller, HDI16, TDM,
UART, I2C, and timer modules.
For details, see the “Clocks and Power Management” chapter of the MSC711x Reference Manual.
Figure 31. PLL Power Supply Filter Circuits
VDDC
VDDPLL
2
Ω
0.1 F 0.01 F
10 F
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