HI-8282A-10 Просмотр технического описания (PDF) - Holt Integrated Circuits

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HI-8282A-10

ARINC 429 Serial Transmitter and Dual Receiver

Holt Integrated Circuits 

HI-8282A

FUNCTIONAL DESCRIPTION (cont.)

REPEATER OPERATION

Repeater mode of operation allows a data word received by the

HI-8282 to be placed directly into the Transmit FIFO for

transmission. After a 32-bit word has been shifted into the

receiver shift register, the D/R flag goes low. A logic "0" is placed

on the SEL line and EN is strobed. This is the same procedure as

for normal receiver operation, placing the lower byte (16) of the

data word on the data bus. By strobing PL1 at the same time as

EN, the byte is also transferred into the Transmit FIFO. SEL is

then taken high and EN is strobed again to place the upper data

word byte onto the data bus. By strobing PL2 at the same time as

EN, the second data word byte is also transferred to the Transmit

FIFO. The data word is now ready for transmission, according to

the parity programmed into the Control Word register.

In normal (non-repeater) operation, either byte of the received

data word may be read first by using the SEL input. During

repeater operation however, data word lower byte must always be

read first. While the data is being read, it is loading concurrently

into the Transmit FIFO, which always loads lower byte first.

TIMING DIAGRAMS

DATA RATE - EXAMPLE PATTERN

429DO

429DO

ARINC BIT

DATA

NULL

BIT 30

DATA

NULL

BIT 31

DATA

NULL

BIT 32

WORD GAP

BIT 1

NEXT WORD

DATA BUS

CWSTR

LOADING CONTROL WORD

VALID

tCWSET

tCWHLD

tCWSTR

ARINC DATA

BIT 31

DATA READY FLAG D/R

BYTE SELECT SEL

ENABLE BYTE ON BUS EN

DATA BUS

BIT 32

RECEIVER OPERATON

tD/R

DON'T CARE

tSELEN

tD/REN

tENDATA

tENSEL

DON'T CARE

tEND/R

tEN

tSELEN

DON'T CARE

tENSEL

BYTE 1 VALID

tENEN

tDATAEN

tENDATA

BYTE 2 VALID

tDATAEN

HOLT INTEGRATED CIRCUITS

6

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