Test mode – Cypress CY7B9911V User Manual
Page 4
CY7B9911V
3.3V RoboClock+™
Document Number: 38-07408 Rev. *D
Page 4 of 14
shows the typical outputs with FB connected to a zero skew output.
Test Mode
The TEST input is a three level input. In normal system
operation, this pin is connected to ground, allowing the
CY7B9911V to operate as described in
on page 3. For testing purposes, any of the three
level inputs can have a removable jumper to ground or be tied
LOW through a 100W resistor. This enables an external tester to
change the state of these pins.
If the TEST input is forced to its MID or HIGH state, the device
operates with its internal phase locked loop disconnected, and
input levels supplied to REF directly control all outputs. Relative
output-to-output functions are the same as in normal mode.
In contrast with normal operation (TEST tied LOW), all outputs
function based only on the connection of their own function
select inputs (xF0 and xF1) and the waveform characteristics of
the REF input.
Figure 1. The Typical Outputs with FB Connected to a Zero Skew Output
t
0
– 6t
U
t
0
– 5t
U
t
0
– 4t
U
t
0
– 3t
U
t
0
– 2t
U
t
0
– 1t
U
t
0
t
0
+1t
U
t
0
t
0
t
0
t
0
t
0
+2t
U
+3t
U
+4t
U
+5t
U
+6t
U
FB Input
REFInput
– 6t
U
– 4t
U
– 3t
U
– 2t
U
– 1t
U
0t
U
+1t
U
+2t
U
+3t
U
+4t
U
+6t
U
DIVIDED
INVERT
LM
LH
(N/A)
ML
(N/A)
MM
(N/A)
MH
(N/A)
HL
HM
LL/HH
HH
3Fx
4Fx
(N/A)
LL
LM
LH
ML
MM
MH
HL
HM
HH
(N/A)
(N/A)
(N/A)
1Fx
2Fx
Note
4. FB connected to an output selected for “zero” skew (that is, xF1 = xF0 = MID).