CT2579 datasheet(17/41 Pages) AEROFLEX

17 / 41 page

APPLICATION NOTE #108

Released 9/98

REM *

REM *******************************************************************************************

REM********************************************************************************************

REM ************ INITIALIZATION ROUTINE

***********************************************

REM *******************************************************************************************

INIT: DEFINT A-Z

OUT 1, 400(h) "WRITE TO THIS ADDRESS TO SET CT2577 INTO RT MODE

INPUT MODE, XX(h) "READ PIN BCNRT FROM THE CT2577

0 = RT MODE

1 = BC MODE

DIM DATA(32)

"LOCATIONS 1-32 = 32 WORDS

REM ******************************************************************************************

REM ************ DETECT COMMAND ROUTINE ****************************************

REM ******************************************************************************************

DETECT: IF NCMDEMPTY = 1 THEN

CMDWORD = INPUT(OOh)

;READ FROM LOCATION 00

MEMPOINT = CMDWORD & 0000011111111111(b)

T/R_BIT = CMDWORD & 0000010000000000(b)

WORDCNT = CMDWORD & 0000000000011111(b)

MEMPOINT = MEMPOINT - 1

"OFFSET POINTER SO THAT FINAL POSITION

"IS AT LOCATION 00. FOR EXAMPLE, A ONE

"WORD TRANSFER SHOULD BE LOADED IN

"LOCATION 00 OF THAT SUBADDRESS.

END IF

IF WORDCNT = 00000(b) THEN

WORDCNT = 32 "ALL ZEROS IN WORD COUNT FIELD = 32 DATA WORDS

END IF

IF T/R_BIT = 0000000000000000(b) THEN

REDIM DATA()

;CLEARS ARRAY DATA()

; GOT TO ROUTINE TO READ OUT

; THE RECEIVED DATA FROM THE 1553 BUS

GOTO RECEIVE

END IF

IF T/R_BIT = 0000010000000000(b) THEN

REDIM DATA()

;CLEARS ARRAY DATA()

FOR J = 1 TO 32

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