GX3290 Datasheet, PDF (21/47 Pages) Semtech Corporation – 290 x 290 3.5Gb/s Crosspoint Switch

Table 4-1: Serial Data Input (Continued)
EQ_BOOST[287:0],
EXT_PG0_EQ_BOOST and
EXT_PG1_EQ_BOOST bits 1:0
(binary)
11
EQ_TERMINATION[287:0],
EXT_PG0_EQ_TERMINATION
and
EXT_PG1_EQ_TERMINATION
bits 3:3
0
1
EQ_POWERDOWN[287:0],
EXT_PG0_EQ_POWERDOWN
and
EXT_PG1_EQ_POWERDOWN
bits 4:4
0
1
Boost Applied (@ nominal 1.5GHz)
12dB boost
35” (89 cm) to 47”
(119 cm) trace
Input Termination Common Mode Point Switch to
VCC_IN_1, VCC_IN_2
Open (see Figure 3-1)
Closed (see Figure 3-1)
Equalizer Power
On
Off
4.2 Serial Data Output
Each of the GX3290 SDI outputs have two on-chip 50Ω single-ended terminations, and
can be programmed to output differential amplitudes of 200mVppd, 400mVppd or
800mVppd when the corresponding VCC_OUT1 or VCC_OUT2 is connected to either
1.2V or 1.8V, or 200mVppd, 400mVppd, 800mVppd, or 1200mVppd when the
corresponding VCC_OUT1 or VCC_OUT2 is connected to 2.5V. The selection of the
output swing is made using the corresponding OUTPUT_SWING_SET[287:0],
MON0_OUTPUT_SWING_SET or MON1_OUTPUT_SWING_SET bits, shown in
Table 4-3.
If the HIGH_OP_V bit is set when either the VCC_OUT1 or VCC_OUT2 supplies are 1.2V
or 1.8V, the 800mVppd swing setting is no longer valid for that output bank. Swing
settings for an output bank connected to a 2.5V supply are unaffected.
Table 4-2: HIGH_OP_V Swing Selection
HIGH_OP_V = 0
VCC_OUTx
Supply Voltage
(V)
1.2
1.8
Valid Output Swing
Selection
(mVppd)
200, 400, 800
200, 400, 800
HIGH_OP_V = 1
Valid Output Swing
Selection
(mVppd)
200, 400
200, 400
Note
1
—
GX3290 290 x 290 3.5Gb/s Crosspoint
Final Data Sheet Rev. 2
GENDOC-053317 March 2013
www.semtech.com
21 of 47
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