GX4002 Datasheet, PDF (22/74 Pages) Gennum Corporation – Dynamic on-chip power management control

V1, V2 and Pre-emphasis are defined as follows:
V1 which represents the “peak”
V2 which represents DC or Steady State
Pre-emphasis [dB] = 20 x log(V1/V2)
The amount of pre-emphasis varies with CH1SDOSWING as shown in Table 3-5:
Table 3-5: Pre-Emphasis vs. Ch1 SDO Swing
CH1SDOSWING
0010 (200mV)
0101 (350mV)
1010 (600mV)
0010 (200mV)
0101 (350mV)
1010 (600mV)
0010 (200mV)
0101 (350mV)
1010 (600mV)
CH1SDOPECTRL
001
001
001
011
011
011
111
111
111
Pre-emphasis
2.3dB
1.8dB
1.0dB
4.7dB
3.8dB
3.1dB
6.2dB
5.5dB
3.4dB
The output can be configured to automatically mute if Ch1 LOS is detected through the
following registers. When muted, the output driver remains powered-up, and the output
common mode is maintained. The output driver can be configured to power-down
when muted by setting the CH1SDOPWRDNONMUTE bit:
Register Name
CH1SDO_REG3
Register
Address^d
79
Parameter Name
Bit
Position
Access
CH1SDOMUTE
5:5
RW
CH1SDOAUTOMUTEEN
6:6
RW
CH1SDOPWRDNONMUTE
7:7
RW
Reset Value^b
0
1
1
Valid
Range^d
Function
When HIGH, mutes driver and maintains
0-1
output common mode when not in auto
mute mode.
0-1
When HIGH, enables muting the driver
upon LOS. LOW disables muting.
When HIGH, enables power-down on mute
0-1
for output stage. LOW disables
power-down.
3.3.5 Channel 1 Output Polarity Invert
The channel 1 output polarity can be inverted through the following register:
Register Name
CH1PLL_REG5
Register
Address^d
24
Parameter Name
CH1PLLPOLINV
Bit
Position
0:0
Access
RW
Reset Value^b
0
Valid
Range^d
Function
0-1
When HIGH, inverts the Ch1 data path
polarity.
GX4002 2x2 14.025Gb/s Crosspoint Switch with Trace
Equalization and Output De-Emphasis
Data Sheet
55972 - 0
March 2012
22 of 74
Proprietary & Confidential