MA28139 Datasheet, PDF (14/34 Pages) Dynex Semiconductor – OBDH Bus Terminal

MA28139
Bit Position
RIRSYNC
RIRCLK
RIRDATA
1
RIRVAL
BCP(1:4)
BCPVAL
Bit Position
RIRSYNC
RIRCLK
RIRDATA
RIRVAL
BCP(1:4)
BCPVAL
1 = BCP(4) or TA(0)
Note 1: Bit 6 of the Interrogation will be interpreted as BCP(4) if (EXTFMT = 0);
if (EXTFMT = 1), the BCP (4) output will be 0 and bit 6 will be interpreted as TA(0).
Note 2: (RIRVAL = 0) (presumably because of bad Interrogation length or received Litton coding errors detected by the
modem), bad received parity in bit 31 of the Interrogation or wrong Interrogation length will both cause the
Interrogation to be rejected and will set BCPVAL = 0.
Figure 12: BroadCast Pulse and BCP Validity Waveforms
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