參數(shù)資料
型號(hào): IBM3209K3114
廠商: IBM Microeletronics
英文描述: IBM Packet Routing Switch Serial Interface Converter(IBM封裝路線選擇開關(guān)串行接口轉(zhuǎn)換器)
中文描述: IBM的分組路由交換機(jī)串行接口轉(zhuǎn)換器(IBM的封裝路線選擇開關(guān)串行接口轉(zhuǎn)換器)
文件頁(yè)數(shù): 115/152頁(yè)
文件大?。?/td> 2390K
代理商: IBM3209K3114
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IBM3209K3114
Advance
IBM Packet Routing Switch Serial Interface Converter
prssi.01
July 12, 2000
I/O Definition and Package Pin Assignment
Page 105 of 142
VDDA filtering for each PLL
The impedance of the ferrite bead should be much greater than that of the capacitor at frequencies where
noise is expected. Many applications have found that a resistor instead of a ferrite bead does a better job
of reducing jitter. The resistor should be kept to a value lower than 2
. Experimentation is the best way
to determine the optimal filter design for a specific application.
Figure 35: VDDA Filtering
Table 27: Back Pressure Serial Link Signals
Name
Input/Out-
put
Level
Description
START_GCXFR
Output
LVCMOS
Start of transfer of the switch grant information asserted by the converter to
the PE to indicate the position of the start of the overall priority cycle in a
superframe. The superframe is made of as many frames as there are priori-
ties in use. This signal is Hi-Z when the interface is not selected
ODD_OQG
Output
LVCMOS
Contains the information per priority related to the switch output queues 0-7
and 16-23. This signal is Hi-Z when the interface is not selected
EVEN_OQG
Output
LVCMOS
Contains the information per priority related to the switch output queues 8-15
and 24-31. This signal is Hi-Z when the interface is not selected.
SHARED_GNT
Output
LVCMOS
Indicate in a frame the relevant priority on the ODD/EVEN OQG serial link
and carry the global shared memory grant. The last bit of each frame carries
the odd parity bit computed on all data bit in the frame. This signal is Hi-Z
when the interface is not selected.
GND
Digital Vdd
Ferrite bead
Murata BLM32A06
or Equivalent
VDDA
100nF
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