Midas RTE-V831-PC, User Manual

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RTE-V831-PC USER’S MANUAL (Rev. 2.00)
27
11. SOFTWARE
This chapter describes the initialization of the hardware of the RTE-V831-PC board, and explains how to
use peripheral devices.
11.1. INITIALIZATION
The boot routine initializes the bus controller built into the V831 for external memory or I/O access. The
wait control and DRAM timing values indicated below assume a bus clock of 33 MHz.
Register Internal I/O address Set value Size Remarks
BCTC C000-0010H 30H Byte
DBC C000-0012H 30H Byte
PWC0 C000-0014H 7470H Half-word
PWC1 C000-0016H 0000H Half-word SRAM: 0 wait state (CS6)
PIC C000-0018H 0000H Half-word
DRC C000-0020H 02H(82H) Byte EDO 60ns (hyper page mode)
RFC C000-0022H 900EH Half-word Approx. 15
m
s
For detailed information about the registers, refer to the manual provided with the V831 CPU.
11.2. LIBRARIES
Libraries are required for programming using the C compiler for I/O accesses and other purposes.
However, the methods of writing these libraries and passing their parameters described below are
specific to the GHS-C. So, modifications may be required, for example, when another compiler is used.
/ * I/O library * /
/ * GHS V800 compiler parameter passing * /
/ * a r g 0 : r 6 , a r g 1 : r 7 , a r g 2 : r 8 , r e t u r n : r 1 0 * /
i n b ( i n t a d d r ) / *
Byte (8 bits) input
* /
{
__
a s m (
“
i n . b 0 [ r 6 ] , r 1 0
”
) ;
}
i n h ( i n t a d d r ) / * Half-word (16 bits) input * /
{
__
a s m (
“
i n . h 0 [ r 6 ] , r 1 0
”
) ;
}
i n w ( i n t a d d r ) / *
Word (32 bits) input
* /
{
__
a s m (
“
i n . w 0 [ r 6 ] , r 1 0
”
) ;
}
o u t b ( i n t a d d r , i n t d a t a ) / *
Byte (8 bits) output
* /
{
__
a s m (
“
o u t . b r 7 , 0 [ r 6 ]
”
) ;
}
o u t h ( i n t a d d r , i n t d a t a ) / *
Half-word (16 bits) output
* /
{
__
a s m ( “ o u t . h r 7 , 0 [ r 6 ] ” ) ;
}
o u t w ( i n t a d d r , i n t d a t a ) / * Word (32 bits) output * /
{
__
a s m (
“
o u t . w r 7 , 0 [ r 6 ]
”
) ;
}