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Dynex - Radiation hard Programmable Communication Interface

Numéro de référence MA28151
Description Radiation hard Programmable Communication Interface
Fabricant Dynex 
Logo Dynex 





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MA28151 fiche technique
Replaces Jone 1999 version, DS3574-4.0
MAM2A821815511
Radiation hard Programmable
Communication Interface
DS3574-5.0 January 2000
The MA28151 is based on the industry standard 8251A
Universal Synchronous Asynchronous Receiver/Transmitter
(USART), modified for data communications with the MAS281
microprocessor.
The MA28151 is used as a peripheral device and is
programmed by the CPU to operate using virtually any serial
data transmission technique presently in use (including IBM
“bi-sync”). The USART accepts data characters from the CPU
in parallel format and then converts them into a continuous
serial data stream for transmission.
Simultaneously, it can receive serial data streams and
convert them into parallel data characters for the CPU. The
USART signals the CPU whenever it receives a character for
transmission or whenever it receives a character for the CPU.
The CPU can read the complete status of the USART at any
time, including data transmission errors and control signals
such as SYNDET and TxEMPTY.
FEATURES
s Radiation Hard to 1MRad(Si)
s Latch Up Free, High SEU Immunity
s Silicon-on-Sapphire Technology
s Synchronous 5 - 8 Bit Characters; Internal or External
Character Synchronisation; Automatic Sync Insertion
s Asynchronous 5 - 8 Bit Characters; Clock Rate - 1, 16 or
64 Times Baud Rate; Break Character Generation, 1 12 or
2 Stop Bits
s All Inputs and Outputs are TTL Compatible
s Compatible with the MAS281 (MIL-STD-1750A)
Microprocessor
Figure 1: MA28151 Block Diagram
The MA28151 is based on the industry standard 8251A
USART, modified for use with the MAS281 processor,
incorporating the following features:
1. MA28151 has double-buffered data paths with separate l/O
registers for control status, data in and data out, which
considerably simplifies control programming and minimizes
CPU overhead.
2. In synchronous operations, the Receiver detects and
handles “break” automatically, relieving the CPU of this task.
3. A refined Rx initialisation prevents the Receiver from
starting when in the “break” state, preventing unwanted
interrupts from the disconnected USART.
4. At the conclusion of a transmission, the TxD line will always
return to the marking state unless SBRK is programmed.
5. Tx Enable logic enhancement prevents a Tx Disable
command from prematurely halting transmission of the
previously written data before completion. The logic also
prevents the transmitter from turning off in the middle of a
word.
6. When external Sync Detect is programmed, Internal Sync
Detect is disabled and an External Sync Detect status is
provided via a flip-flop, which clears itself upon a status read.
7. The possibility of a false sync detect is minimized in two
ways: by ensuring that if double character sync is
programmed, the characters will be continuously detected and
by clearing the Rx register to all 1’s whenever Enter-Hunt
command is issued in Sync mode.
8. When the MA28151 is not selected, the RDWN and DSN
lines do not affect the internal operation of the device.
9. The MA28151 Status can be read at any time but the status
update will be inhibited during status read.
10. The MA28151 is free from extraneous glitches, providing
higher speed and better operating margins.
11. Synchronous Baud rate is from DC to 64K.
12. Asynchronous Baud rate is from DC to 19.2K.
1/22

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