GX4002 Datasheet, PDF (28/74 Pages) Gennum Corporation – Dynamic on-chip power management control

160
140
120
100
80
60
40
20
0
0
Hys = 0
50
Hys = 9
0dB
Hys = 15
3dB
6dB
100
150
200
250
300
CH0LOSTHNEG
Figure 3-10: Ch0 LOS Assert Threshold – Typical
Hys = 0
160
Hys = 9
140
120
100
80
60
40
20
0
0
50
100
150
200
CH0LOSTHNEG
Figure 3-11: Ch0 LOS De-Assert Threshold – Typical
The LOS threshold will have a slight dependence on data rate.
3.5.1.2 Manual LOS Assert
The on-chip LOS circuit can be bypassed, and LOS asserted, through the host interface.
This operation is initiated when CH0LOSSOFTASSERTEN is HIGH. The state of
CH0LOSSOFTASSERT then controls the LOS register CH0PLLLOS and external
indication through Ch0FAULT.
Register Name
CH0_REG12
Register
Address^d
61
Parameter Name
CH0LOSSOFTASSERT
CH0LOSSOFTASSERTEN
Bit
Position
Access
3:3
RW
4:4
RW
Reset Value^b
0
0
Valid
Range^d
Function
When HIGH, asserts LOS.
0-1
CH0LOSSOFTASSERTEN must be HIGH to use
this bit.
0-1
When HIGH, LOS is controlled by
CH0LOSSOFTASSERT.
GX4002 2x2 14.025Gb/s Crosspoint Switch with Trace
Equalization and Output De-Emphasis
Data Sheet
55972 - 0
March 2012
28 of 74
Proprietary & Confidential