HI-3282B 查看數據表（PDF） - Holt Integrated Circuits

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HI-3282B

ARINC 429 Serial Transmitter and Dual Receiver

Holt Integrated Circuits 

HI-3282, HI-3282B

FUNCTIONAL DESCRIPTION (cont.)

REPEATER OPERATION

The repeater mode of operation allows a data word that has been

received by the HI-3282 to be placed directly into its FIFO for

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

shift register, the D/R flag will go low. A logic "0" is placed on the SEL

line and EN is strobed. This is the same procedure as for normal

receiver operation and it places the lower byte (16) of the data word

on the data bus. By strobing PL1 at the same time as EN, the byte

will also be placed into the transmitter FIFO. SEL is then taken high

and EN is strobed again to place the upper byte of the data word on

the data bus. By strobing PL2 at the same time as EN, the second

byte will also be placed into the FIFO. The data word is now ready to

be transmitted according to the parity programmed into the control

word register.

In normal operation, either byte of a received data word may be read

from the receiver latches first by use of SEL input. During repeater

operation however, the lower byte of the data word must be read

first. This is necessary because, as the data is being read, it is also

being loaded into the FIFO and the transmitter FIFO is always

loaded with the lower byte of the data word 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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