MA28139 Datasheet, PDF (4/34 Pages) Dynex Semiconductor – OBDH Bus Terminal

MA28139
OBDH
NOMINAL
BUS #1
REDUNDANT
BUS #2
I R BT I R BT
BUS
TIME
CT
LOSC OUT SIMUL MODE RESET TA0-5 TAV
CLOCK
DETECTOR
WATCHDOG
BUS 1/2
ACTIVE
RTU
KERNEL
NIDS1/2n,
RIDS1/2n
BAR1
I-BUS RX
BAT1
OPEN
2F
0v
RR1-4,
R-BUS TX
(RT MODE)
0v
NRE, RRE
I-BUS TX
(CT MODE)
NRDS1/2n
RRDS1/2n
BAR2
R-BUS RX
IUB
DATARRT
ENRRT
SYNC, CLK, DATA, VAL RIR
SEL
MOD
CLK
CIT
SYNC
INV
DATA
EN
RRT
DBI
CLK, DATA, VAL _RRR/CRR
INIT
BR1-4,
NBE, RBE
NBDS1/2n,
RBDS1/2n
BAT2
BT-BUS TX
BAR3
BT-BUS RX
MA28139 OBT
DATA _RBT/CBT
EN
CLK, DATA, VAL
INIT
RBR/
CBR
Figure 4: Architecture
Note: Switches in lower position - RT mode
Switches in upper position - CT mode
MODEM Modulation Waveforms are compliant with ESA document THB/Apo/KZ/1386/av. Waveforms indicating the
operation of BAT1, 2 and BAR1, 2, 3 in both the CT and RT modes are shown in Figures 5 to 8.
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