Specifications

126 www.xilinx.com Embedded System Tools Guide (EDK 6.2i)

1-800-255-7778 UG111 (v1.4) January 30, 2004

Chapter 7: Library Generator

XMDSTUB Peripherals (MicroBlaze Specific)

These are peripherals that are used specifically for debug with the xmdstub program (For

more information about the debug program xmdstub, refer to Chapter 13, “Xilinx

Microprocessor Debugger (XMD)”). The attribute XMDSTUB_PERIPHERAL is used for

denoting the debug peripheral instance. LibGen uses this attribute to generate the debug

program xmdstub.

STDIN and STDOUT Peripherals

Peripherals that handle I/O need drivers to access data. Two files inbyte.c and

outbyte.c are automatically generated with calls to the driver I/O functions for STDIN

and STDOUT peripherals. The driver I/O functions are specified in the MDD as the

parameters INBYTE and OUTBYTE. These inbyte and outbyte functions are used by C

library functions such as scanf and printf. The peripheral instance should be specified as

STDIN or STDOUT in the MSS file. The STDIN/STDOUT parameters are attributes of the

standalone OS. The inbyte and outbyte functions are generated only when the STDIN and

STDOUT attributes are specified in MSS file for the standalone OS. Each OS is responsible

for handling the STDIN/STDOUT functionality.