Intel 386 - Manual (Page 475)

Intel386™ EX EMBEDDED MICROPROCESSOR USER’S MANUAL
15-14
Figure 15-8. RAS# Only Refresh Logic: Non-Paged Mode
15.6 PROGRAMMING CONSIDERATIONS
REFRESH# and CS6# share a package pin. To select the REFRESH# signal at this pin, set bit 6
in the PINCFG register:
_SetEXRegByte(PINCFG, (_GetEXRegByte(PINCFG) | 0x40));
15.6.1 Refresh Control Unit Example Code
The following code example contains software routines that initialize the refresh control unit and
retrieve the current value of the refresh interval timer. See Appendix C for the included header
files.
#include <conio.h>
#include “80386ex.h”
#include “ev386ex.h”
/*****************************************************************************
InitRCU:
Description:
Initializes the Refresh Control Unit
Intel386™ EX
Embedded Processor
Row
Address
Buffer
PLD
Lower Address
Row
Address
Non-paged
DRAM
Column
Address
Address
Upper Address
OE_ROW#
OE_COL#
RAS#
CAS#
BHE#
BLE#
A3265-02
Column
Address
Buffer
CS n#
REFRESH#
Note:
A single mux can be used in place of the row and column address buffers.