MA28151 datasheet(1/22 Pages) DYNEX

Part #	MA28151

Description	Radiation hard Programmable Communication Interface

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Manufacturer	DYNEX [Dynex Semiconductor]

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MA28151

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Figure 1: MA28151 Block Diagram

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 1⁄2 or

2 Stop Bits

s All Inputs and Outputs are TTL Compatible

s Compatible with the MAS281 (MIL-STD-1750A)

Microprocessor

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.

MA28151

Radiation hard Programmable

Communication Interface

Replaces Jone 1999 version, DS3574-4.0

DS3574-5.0 January 2000

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