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MIL-STD-1750A Resource Center

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Features & Specifications

Contents

• Languages
• Operating systems
• Target processors
• Basic data types
• Additional data types
• Address space
• Relocatable memory segments
• Core library routines
• Interrupt processing

Languages

• Pre-ANSI C with ANSI C prototype support

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Operating systems

• Linux
• Sun Solaris 1.X
• Sun Solaris 2.3 or higher

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Target processors

• National Semiconductor F9450
• Honeywell Generic VHSIC Spaceborne RH1750
• Honeywell PDU/SDU
• Performance Semiconductor PACE 1750A
• Marconi Electronic Devices MIL-STD-1750A.
• Fairchild SBC

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Basic data types

Data type	Description
char	unsigned 8-bit integer
short	signed 16-bit integer
long	signed 32-bit integer
int	same as "short"
float	32-bit MIL-STD-1750A floating-point value
double	48-bit MIL-STD-1750A floating-point value
enum	enumerated data type(s)
unsigned	same as "char"
unsigned	short unsigned 16-bit integer
unsigned	long unsigned 32-bit integer
unsigned	int same as "unsigned short"

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Additional data types

XTC-1750A also supports pointers, arrays, structures, and unions. These data types can be nested to three levels.

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Address space

• Storage unit: 16-bit word
• Addressing range: 64K words
• User-defined address states specify virtual address space, which is mapped into arbitrary blocks of physical memory
• Code and data mapped into the same 64K-word address space
• "C" used to access multiple address spaces through overlays

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Relocatable memory segments

Segment	Description	Mapping
IREL	Run-time initialization code	ROM
KREL	Constants (excluding in-line constants)	ROM
NREL	Normal user code	ROM
SREL	Global and static variables	RAM
ZREL	General-purpose segment	RAM or ROM

Notes on memory segments:

• The XTC-1750A compiler generates most 16-bit numeric constants in-line using 1750A instructions.
• The IREL segment contains code that copies constants from the KREL segment to variables located in the SREL segment; the XTC-1750A program start-up module calls the IREL code at start-up time.

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Core library routines

Note: Additional routines provided on request

General-purpose library routines
atof	atoi	atol	index	isalnum	isalpha
isascii	iscntrl	isdigit	iseol	islower	isodigit
isprint	ispunct	isspace	isupper	isxdigit	itoa
longjmp	rindex	setjmp	strcat	strchr	strcmp
strcpy	strcspn	strlen	strncat	strncmp	strncpy
strpbrk	strrchr	strspn	toascii	tolower	toupper

Math routines
abs	acos	acosh	acot	acoth	acsc
acsch	asec	asin	asinh	atan	atan2
atanh	cbrt	ceil	cos	cosh	cot
coth	csc	csch	dtor	exp	fabs
floor	frac	hypot	ipow	log	log10
pow	powe	powi	rand	rtod	sec
sech	sin	sinh	sqrt	srand	tan
tanh

Memory allocation routines
calloc	free	malloc	mflush	realloc

Standard I/O routines
fprintf	getc	getchar	getcnb	printf	putc
putchar	putcnb	scanf	sprintf

Port-Level I/O routines
inb	outb

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Interrupt processing

• Interrupt handlers are written in assembly language; "C" subroutines may be used

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