Analog Devices ADRV9001 User Manual page 125

Reference Manual
FREQUENCY HOPPING
ORx Operation
The ADRV9001 supports ORx operation in the FH modes. ORx in FH works like the normal TDD mode. During the actual Tx frame, set the
ORx enable signal (assign to a DGPIO pin) high to enable ORx. Before the end of the Tx frame, set ORx low to disable ORx. Note this
is required regardless of whether the next frame is Tx or Rx. Take the ORx setup and bring down time into consideration, as well as the
propagation delay of the profile.
restrictions.
Table 52. ORx Timing Parameters Time Required
Timing Parameter
t
OrxRiseToOn
t
OrxFallToOff
Table 53. ORx Timing Parameters Timing Restrictions
Timing Parameter
t
HopEdgeToORxRise
t
ORxFallToHopEdge
When using ORx in frequency hopping, consider the following parameters to determine the frame duration:
ORx enable rising edge time (t
►
ORx enable falling edge time (t
►
Propagation delay (t
►
propagationDelay
The total time the ORx is enabled should be at least (t
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Figure 122. FPGA Delay Method for Tx Only Hopping with Short Propagation Delay
Table 52 shows the required time to set up and bring down the ORx and
8
6
Timing Restriction
Must be greater than the transition time, or t
Allow enough time for the ORx disable to complete.
)
OrxRiseToOn
)
OrxFallToOff
)
OrxRiseToOn
Time Required (μs)
Narrowband
.
TxRiseToOn
+ t ), otherwise no valid data is received.
propagationDelay
ADRV9001
Table 53 shows the ORx timing
Wideband
9
5
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