参数资料
型号: 440EPX
厂商: Applied Micro Circuits Corp.
英文描述: PowerPC 440EPx Embedded Processor
中文描述: 嵌入式处理器的PowerPC 440EPx
文件页数: 66/94页
文件大小: 738K
代理商: 440EPX
Receiver
AC Overshoot (V)
DC Overshoot (V)
DC Undershoot (V)
AC Undershoot (V)
TOS
3.3V LVTTL
3.9
3.6
-0.16
-0.6
0.1*TCYC
1
2.5V (3.3V tolerant)
3.9
3.6
-0.16
-0.6
0.1*TCYC
1
DDR
1.2*SOVDD
SOVDD + 0.3
-0.3
-0.6
0.1/MemClkOut
PCI
1.2*OVDD
OVDD + 0.5
-0.5
-0.2*OVDD
0.1/PCIClk
Notes:
1. TCYC is the period of the bus clock.
1/PerClk - EBC and NAND flash interfaces.
1/GMCRXClk - GMII and MII modes
1/SMIIRefClk - SMII mode
1/GMCGRXClk - RGMII mode
1/USB2Clk - UTMI
1/TrcClk - instruction trace interface
1/IIC0Clk and 1/IIC1Clk - IIC interfaces
1/SPIClkOut - SPI
440EPx – PPC440EPx Embedded Processor
Revision 1.26 – October 15, 2007
AMCC Proprietary
69
Preliminary Data Sheet
Power Sequencing
Startup sequencing of the power supply voltages is not required. However, a power-down cycle must complete
(OVDD and VDD are below +0.4V) before a new power-up cycle is started.
Analog Voltage Filter
The analog voltages (AVdd, EAVdd, and UnAVdd) used for the on-chip PLLs can be derived from the logic voltage, but must be
filtered before the PPC440EPx. A Separate filter, as shown below, is recommended for each voltage.
The filter should keep the analog voltage to analog ground compression/expansion due to noise less than +50
mV.
Keep all wire lengths as short as possible.
Analog grounds must be brought out and connected to the digital ground plane at the filter capacitor.
The impedance of the ferrite bead should be much greater than that of the capacitor at frequencies where
noise is expected.
VDD
C
L
L – SMT ferrite bead chip, Murata
BLM21PG600SN1
GND
AVDD, SAVDD, UnAVdd
AGND, SAGND, UnAGND
Table 12. Overshoot and Undershoot
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