5962F9466310VXA View Datasheet(PDF) - Aeroflex UTMC
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5962F9466310VXA Datasheet PDF : 177 Pages
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1.2.1 Multiple Message Processing
The SBC architecture allows the chaining of multiple MIL-
STD-1553 commands into major and minor frames depending
on the application. This feature allows the host to structure
message frames that perform independent tasks such as periodic
data transfer, service requests, and bus diagnostics (initiate
BIT). The SBC uses a simple opcode scheme to control the
command block flow.
1.2.2 Message Scheduling
The SBC allows host entry of data to control the time between
messages. This feature is useful when the BC has to perform
periodic message transactions with multiple remote terminals.
1.2.3 Polling
The host instructs the SBC to interrogate the status word
response of remote terminals to determine if any SBC action is
required. The SBC can detect the assertion of status word bits
and generate interrupts or branch to a new message frame.
Polling is useful if the application requires control of message
frame flow as a function of remote terminal response.
1.2.4 Automatic Retry
The SBC can automatically retry a message on busy, message
error, or other status word bit response. If enabled, the SBC can
retry up to four times, per command block, on the primary bus
or alternate bus.
1.3 Monitor Terminal Features
The SµMMIT Monitor Terminal (SMT) is a full-featured MIL-
STD-1553B bus monitor designed to monitor all or selected
remote terminals on the bus. Requiring little host intervention,
the SMT will monitor selected remote terminals until a pre-
defined message count is reached. Generation of an interrupt
alerts the host that SMT service is required.
1.3.1 Message Information
Each message transaction generates a Message Information
Word. This information helps determine message validity and
remote terminal health. The Message Information Word is
stored in external memory along with message data words.
1.4 Remote Terminal/Monitor Terminal Feature
For those applications that require the SMT to transfer or receive
information, the SµMMIT is configured as both a remote
terminal (SRT) and monitor (SMT). This feature allows the
SMT to communicate on the bus as a RT, and monitor bus
activity. Configuration as both SMT and SRT precludes the
SMT from monitoring its own remote terminal address.
1.5 Protocol Definition
For maximum flexibility, the SµΜΜIT has been designed to
operate in many different systems which use various protocols.
Specifically, two of the protocols that the SµMMIT may
interface are MIL-STD-1553A and MIL-STD-1553B. To meet
these protocols, the SµΜΜIT may be configured through an
external pin or through control register bits.
1.6 SµMMIT LXE/DXE & XTE Transceivers
Internal monolithic transceivers are complete transmitter and
receiver pairs for MIL-STD-1553A and 1553B applications.
The receiver section accepts biphase-modulated Manchester II
bipolar data from MIL-STD-1553 data bus and produces TTL-
level signal data at its internal RXOUT and RXOUT outputs.
The transmitter section accepts biphase TTL-level signal data
at its internal TXIN and TXIN inputs and produces MIL-STD-
1553 data signals. The transmitter’s output voltage is typically
10VP-P,LL for the SµMMIT XTE5 & DXE and 42VP-P,LL for
the SµMMIT XTE15, XTE12 & LXE.
1.7 SµMMIT XTE Memory
The SµMMIT XTE contains 512 Kbits of internal memory for
message processing. Internal logic generates a RDY signal for
the subsystem interface. The internal memory is memory
mapped.
SµMMIT FAMILY - 2
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