GX4002 Datasheet, PDF (35/74 Pages) Gennum Corporation – Dynamic on-chip power management control

SDO0
External
Loopback
SDI1
Recovered
Clock
HEye Monitor
Ch0 CDR (10G/14G)
Retimed
Data
Input
Data
LBCH0INEN = 0
0
1
Peak
Detector
VEye
Monitor
Ch0 EQ
SDI0
fclk/8 (14G)
fclk/4 (10G)
Ch0 Driver
Peak
Detector
VEye
Monitor
Ch1 LA
0
LBCH0OUTEN = 1 _{LBCH0OUTPRBSGEN}
1
0
0 =1
PRBSGENCLKSEL = 1
1
1
1
CH0PLLPOLINV
0
Ch0Clk
PRBS 7
Generator
PRBS 7
Checker
Ch1Clk
1
0 _{CH1PLLBYPASS = 0}
CH1PLLPOLINV
1
0
0
1
LBCH1OUTEN = 0
Ch1 Drv
1
0
LBCH1INEN = 0
Input
Data
Retimed
Data
Ch1 CDR (10G/14G)
HEye Monitor
Recovered
Clock
PRBSCHKCLKSEL = 0
High-speed Data
High-speed Clock
Low-speed Reference
PRBS Out
SDO1
Figure 3-18: PRBS Generator on Ch0 Output and PRBS Check Monitoring Ch1 Input
The following registers enable and configure the PRBS generator and checker:
Register Name
Register
Address^d
TOP_REG3
3
TOP_REG6
6
LOOPBK_REG1
7
LOOPBK_REG2
8
LOOPBK_REG3
9
PWRDN_REG2
161
Parameter Name
PRBSGENSTART
PRBSCHKCLEARERR
PRBSCHKSTATUS
LBCH1INPRBSGEN
LBCH1OUTPRBSGEN
LBCH0INPRBSGEN
LBCH0OUTPRBSGEN
PRBSGENCLKSEL
PRBSCHKCLKSEL
PDPRBSGEN
PDPRBSCHK
Bit
Position
Access
0:0
RW
1:1
RW
0:0
RO
1:1
RW
6:6
RW
1:1
RW
6:6
RW
0:0
RW
1:1
RW
1:1
RW
2:2
RW
Reset Value^b
0
0
0
0
0
0
0
0
0
1
1
Valid
Range^d
Function
0-1
When pulsed HIGH and LOW, starts off the
PRBS generator.
0-1
When HIGH, clears the latched error flag
from checker.
0-1
When HIGH, checker detected an error.
0-1
Selects PRBS generator output into Ch1
CDR.
0-1
Selects PRBS generator output into Ch1
Driver.
0-1
Selects PRBS generator output into Ch0
CDR.
0-1
Selects PRBS generator output into Ch0
Driver.
0-1
When HIGH, selects Ch0 recovered clock.
LOW selects Ch1 clock.
0-1
When HIGH, selects Ch0 recovered clock.
LOW selects Ch1 clock.
0-1
When HIGH, power-down the PRBS
generator and associated buffers.
0-1
When HIGH, power-down the PRBS
generator and associated checkers.
GX4002 2x2 14.025Gb/s Crosspoint Switch with Trace
Equalization and Output De-Emphasis
Data Sheet
55972 - 0
March 2012
35 of 74
Proprietary & Confidential