GX9533(1999) 데이터 시트보기 (PDF) - Gennum -> Semtech
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GX9533 Datasheet PDF : 8 Pages
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DETAILED DESCRIPTION
DIFFERENTIAL INPUTS
The inputs to the GX9533 will accept both SMPTE 259M as
well as PECL input levels. The fully differential data path
provides low jitter data rates of up to 700Mb/s.
The main inputs (IN0..7) and expansion inputs (EXP0..7) are
normally connected to a biased differential data source.
The GX9533 inputs are not self biased, so unused inputs
should be connected as shown in Figure 3 or Figure 4.
VCC
1k
INx
GX9533
INx
Fig. 3 Preferred Termination Of Unused Inputs
VCC
INX
GX9533
NC
INX
Fig. 4 Alternate Termination of Unused Inputs
Terminating the inputs as shown in Figure 3 will provide the
highest noise immunity, since there is no possibility of noise
coupling into the unconnected input pin.
I/O ADDRESS SELECTION
The GX9533 has a versatile LOAD/CONFIGURE
architecture which simplifies IN/OUT switch configuration.
An output is normally connected to an input by a two stage
process:
Stage One: Loading The Configuration Into Latches
1. The output address is selected on the OA pins as
shown in Table 1.
2. The input address is selected on the IA pins as shown in
Table 2.
3. A LOAD pulse then transfers the output and input
addresses into the GX9533 LOAD latch.
The above three steps can be repeated up to eight times in
order to configure the latch for all eight outputs.
During step 3 above, if the LOADA pulse is also strobed,
the latch is configured to connect the selected input to the
ninth, auxiliary output.
TABLE 1: Output Address Selection
OA2
0A1
0A0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
OUTPUT PORT
0
1
2
3
4
5
6
7
TABLE 2: Input Source Address Selection
IA3
IA2
IA1
IA0
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
X
X
1
1
X
X
INPUT
PORT
0
1
2
3
4
5
6
7
EXP
Quiet
Mode
Note that a QUIET mode is available as shown in Table 2. In
QUIET mode, the outputs are latched in a DC state with
OUTX = 1 and OUTX = 0.
Stage Two: Configuring The Matrix
A CONFIGURE strobe is applied to transfer the contents of
the LOAD latch into the CONFIG latch. This action will
cause the data flow through the GX9533 to be switched to
the new configuration. Refer to Figure 6 for detailed timing
information.
Note that any single output can be asynchronously
switched by having LOAD (or LOADA if desired) held high
while CONFIG is strobed.
6
521 - 41 - 03
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