Commands #1, #2, and #3 control the 25 output pin levels of the DAFC board. These
transmissions may be interspersed with the PLL-16 format in systems that require both
clock locking and AFC, for example, a dual- receiver magnetron system using a digitally
synthesized COHO. All 25-bits of pin information are transferred synchronously to the
output pins only when CMD=3 is received. This makes sure that momentary invalid patterns
are not produced upon arrival of CMD=1 or CMD=2 when the output bits are changing.
Digital AFC Pinmap Commands
The CMD=1, CMD=2, CMD=3 digital AFC pinmap commands are the recommended
replacement to the original AFC-16 format.
If you only need 12-bits of linear AFC, map the AFC range to the -2048 ... +2047 numeric
span, and select binary coding format (See 5.2.1 Mb — Burst Pulse and AFC (page 93)).
The 12-bit data with CMD=3 then holds the required values.
To get a full 16-bit value, use a -32768 ... +32767 span and extract the full word from CMD=2
and CMD=3. Other combinations of bit formats and number of bits (up to 25) are also
possible.
CMD=4 also controls some IFDR internal features.
Table 27 Digital AFC Pinmap Commands
Command Data Value Description
CMD=1 Data<0>
DAFC output pin 25
Data<6>
Fault input is active high
Data<11:7>
Which pin to use for fault input (0:None)
CMD=2 Data<11:0>
DAFC output pins 24 through 13
CMD=3 Data<11:0>
DAFC output pins 12 through 1
RVP900 User Guide M211322EN-J
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