MA28138
MARCH 1995
PRELIMINARY INFORMATION
DS3591-4.4
MA28138
OBDH REMOTE BUS INTERFACE
The MA28138 is an OBDH Remote Bus Interface (RBI)
that provides the facilities required by a modern packet OBDH
bus system but at the same time preserves compatibility with
existing RTU hardware and software. Designed under an ESA
contract, the RBI ASIC implements the ESA RBI-2 Remote
Bus Interface and 8-bit Broadcast Polling protocols for
transfers of data between the OBDH DBI bus and processor
memory.
Linked to the OBDH bus via a bus terminal (MA28139
OBT), the RBI executes central terminal instructions from the
Interrogation bus including mission configurable user
commands and status. The RBI handshakes all CTU
commands on the Response bus and traps DMA errors. The
RBI supports bi-directional data transfers on the Response
bus allowing the possibility of working without a Block Transfer
bus. The inclusion of a Block Transfer bus using this RBI in an
OBDH system will increase its throughput capacity by about a
factor of four.
I-BUS
RIRSYNC
RIRCLK
RIRDATA
RIRVAL
RRRCLK
RRRVAL
RRRDATA
RRRINIT
RRTDATA
RRTEN
SREQ
BIL(0:5)
UCC(0:6)
UCCS
USER
R-BUS
DBI
BT-BUS
RBRCLK
RBRDATA
RBRVAL
RBRINIT
RBTDATA
RBTEN
TA(0:5)
EXTFMT
EXTAEN
RBI
OSC
SYNCN
AD(0:15)
AS
DSN
RDPWN
MPION
INPOPN
DMADDN
RDYN
SYNDN
µP
BUS
ADDRESSING
FEATURES
s
s
s
s
s
s
s
s
Radiation Hard
Low Power Consumption
Single CMOS-SOS ASIC Implementation
Direct Connection to Processor Address/Data and Control
Busses
Programmable User-to-User Group Transfers
Can Support Bi-directional DMA Transfers without Block
Transfer Bus
Block Transfers Supported
Fully Compliant with ESA RBI-2 Protocol, ESTEC
WDI/CS/928
BROADCAST
POLL
RESET
GI(0:1)
PBP(0:4)
MRSTN
DMARN
DMAKN
DONE
TFRERR
BCP(1:4)
BCPVAL
DMA
BROADCAST
PULSES
Figure 1: Block Diagram
1
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
