GX3190 Datasheet, PDF (22/47 Pages) Semtech Corporation – Crosspoint Switch with Trace Equalization and Output De-emphasis

Table 4-2: HIGH_OP_V Swing Selection (Continued)
HIGH_OP_V = 0
HIGH_OP_V = 1
VCC_OUTx
Supply Voltage
(V)
Valid Output Swing
Selection
(mVppd)
Valid Output Swing
Selection
(mVppd)
Note
2.5
200, 400, 800
200, 400, 800, 1200
2
Notes:
1. For an 800mVppd output swing when the corresponding VCC_OUT1 or VCC_OUT2 is connected
to 1.2V, the output must be DC-coupled to a receiving device terminated to 1.2V.
2. When VCC_OUT1 or VCC_OUT2 is set to 2.5V, the HIGH_OP_V bit must be set to enable
1200mVppd swing selection.
Each of the 290 SDI output channels provide independently programmable
de-emphasis, to compensate from 0 to 47 inches (119 cm) of FR4 trace at 3Gb/s. The
selection of the amount of output de-emphasis is made using the corresponding
OUTPUT_DEEMPHASIS[287:0], MON0_OUTPUT_DEEMPHASIS or
MON1_OUTPUT_DEEMPHASIS bits, shown in Table 4-3.
Each output can be independently powered-down by the setting of the corresponding
bit: ACTIVE_POWER_DOWN[287:0], DYNAMIC_POWER_DOWN[287:0] together
with the assigned strobe, MON0_POWER_DOWN, or MON1_POWER_DOWN.
The polarity of the signal at each output can be independently inverted by setting the
corresponding bit: ACTIVE_SIGNAL_INVERT[287:0],
DYNAMIC_SIGNAL_INVERT[287:0] together with the assigned strobe,
MON0_SIGNAL_INVERT, or MON1_SIGNAL_INVERT.
Table 4-3: Serial Data Output
OUTPUT_SWING_SET[287:0],
MON0_OUTPUT_SWING_SET and
MON1_OUTPUT_SWING_SET
bits 2:0 (binary)
000
001
011
110
111
Output Swing
200mVppd
400mVppd
800mVppd
1200mVppd
Reserved. Do not use.
OUTPUT_DEEMPHASIS[287:0],
MON0_OUTPUT_DEEMPHASIS and
MON1_OUTPUT_DEEMPHASIS bits 5:3
(binary)
Level of De-emphasis
000
Off
100
12” (30 cm) nominal
101
24” (60 cm) nominal
110
36” (90 cm) nominal
111
48” (120 cm) nominal
GX3190 146 x 290 3.5Gb/s Crosspoint
Final Data Sheet Rev. 2
GENDOC-056076 March 2013
www.semtech.com
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