M:/USB-BDI/USB-BDI/Firmware/MPC555-USB-BDI/include/syncdelay.h File Reference

This file contains only the SYNCDELAY MACRO. More...

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Defines
#define	SYNCDELAY   __asm nop; nop; nop; __endasm
#define	NOP   __asm nop; __endasm

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Detailed Description

This file contains only the SYNCDELAY MACRO.

Author:

Schlaepfer Stephan

Version:

1.0

Date:

18.1.2006

Magic delay required between access to certain xdata registers (TRM page 15-106). For our configuration, 48 MHz FX2 / 48 MHz IFCLK, we need three cycles. Each NOP is a single cycle....

From TRM page 15-105:

Under certain conditions, some read and write access to the FX2 registers must be separated by a "synchronization delay". The delay is necessary only under the following conditions:

• between a write to any register in the 0xE600 - 0xE6FF range and a write to one of the registers listed below.

• between a write to one of the registers listed below and a read from any register in the 0xE600 - 0xE6FF range.

Registers which require a synchronization delay:

FIFORESET FIFOPINPOLAR INPKTEND EPxBCH:L EPxFIFOPFH:L EPxAUTOINLENH:L EPxFIFOCFG EPxGPIFFLGSEL PINFLAGSAB PINFLAGSCD EPxFIFOIE EPxFIFOIRQ GPIFIE GPIFIRQ UDMACRCH:L GPIFADRH:L GPIFTRIG EPxGPIFTRIG OUTPKTEND REVCTL GPIFTCB3 GPIFTCB2 GPIFTCB1 GPIFTCB0

Definition in file syncdelay.h.

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Define Documentation

#define NOP   __asm nop; __endasm

1 times nop

Definition at line 63 of file syncdelay.h.

#define SYNCDELAY   __asm nop; nop; nop; __endasm

3 times nop

Definition at line 61 of file syncdelay.h.