GS9076 查看數據表（PDF） - Semtech Corporation
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GS9076 Datasheet PDF : 25 Pages
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GS9076 Data Sheet
4.6 4:1 Input Mux
The 4:1 input mux allows the connection of four independent streams of video/data.
There are four differential inputs (DDI[3:0] and DDI[3:0]). The active channel can
be selected via the DDI_SEL[1:0] pins. Table 4-1 shows the input selected for a
given state at DDI_SEL[1:0].
Table 4-1: Bit Pattern for Input Select
DDI_SEL[1:0]
00
01
10
11
Selected Input
DDI0
DDI1
DDI2
DDI3
The DDI inputs are designed to be DC interfaced with the output of the GS9074A
Cable Equalizer. There are on chip 50Ω termination resistors which come to a
common point at the DDI_VT pins. Connect a 10nF capacitor to this pin and
connect the other end of the capacitor to ground. This terminates the transmission
line at the inputs for optimum performance.
If only one input pair is used, connect the unused positive inputs to +3.3V and leave
the unused negative inputs floating. This helps to eliminate crosstalk from potential
noise that would couple to the unused input pair.
4.7 Automatic and Manual Data Rate Selection
The GS9076 can be configured to manually lock to a specific data rate or
automatically search for and lock to the incoming data rate. The AUTO/MAN pin
selects automatic data rate detection mode (Auto mode) when HIGH and manual
data rate selection mode (Manual mode) when LOW.
In Auto mode, the SS[2:0] bi-directional pins become outputs and the bit pattern
indicates the data rate that the PLL is locked to (or previously locked to).
In Manual mode, the data rate can be programmed and the SS[2:0] pins become
inputs. In this mode, the PLL will only lock to the data rate selected.
Table 4-2 shows the SS[2:0] pin settings for either the data rate selected (in
Manual mode) or the data rate that the PLL has locked to (in Auto mode).
Table 4-2: Data Rate Indication/Selection Bit Pattern
SS[2:0]
010
Data Rate (Mb/s)
270
44617 - 1 January 2008
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