Datasheet

active serial stream X
PDB
(DES)
RIN
(Diff.)
LOCK
CLKOUT*
(DES)
PASS
OFF
OFF
Active ActiveLocking
Z
L
H
L
H
Z
H
Z Z Z
Z Z Z
Z Z
CONDITIONS: * RFB = L, and OSS_SEL = L
DO[23:0],
CO1,CO2,CO3
C0 or C1 Error
In Bit Stream
(Loss of LOCK)
DS92LV2421, DS92LV2422
SNLS321B –MAY 2010–REVISED APRIL 2013 www.ti.com
Des — Oscillator Output — Optional
The Des provides an optional clock output when the input clock (serial stream) has been lost. This is based on
an internal oscillator. The frequency of the oscillator may be selected. This feature may be controlled by the
external pin or by register. See Table 9 and Table 10.
Table 8. OSS_SEL and PDB Configuration — Des Outputs
INPUTS OUTPUTS
Serial PDB OSS_SEL CLKOUT DO[23:0], LOCK PASS
Input CO1, CO2,
CO3
X L L Z Z Z Z
X L H L L L H
Static H L Z Z L H
Static H H L L L H
Active H X Active Active H H
Table 9. OSC (Oscillator) Mode — Des Output
INPUTS OUTPUTS
Embedded CLK CLKOUT DO[23:0]/CO1/CO2 LOCK PASS
/CO3
See
(1)
OSC L L H
Output
Present Toggling Active H H
(1) Absent and OSC_SEL ≠ 000
Figure 23. Des Outputs with Output State Select Low (OSS_SEL = L)
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