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System Control register......................................................... 63
System Status register ..........................................................68
Software Service register....................................................... 70
Timer Control registers................................ .........................70
Timer Status registers...........................................................73
PORTA Configuration register.................................................. 74
PORTC Configuration register.................................................. 77
Interrupts.... ............................................................................ 80
Interrupt controller registers ..................................................81
Chapter 7: Memory Controller Module................................. 85
About the MEM module ................................................................86
MEM module hardware initialization.................................................86
Pin configuration.................................................................86
MEM module configuration................................... .........................88
Setting the chip select address range ........................................88
Memory Module Configuration register....................................... 90
Chip Select Base Address register............................................. 93
Chip Select Option Register A .................................................97
Chip Select Option Register B.................................................101
Static memory (SRAM) controller ...................................................102
Single cycle read/write........................................................103
Burst cycles......................................................................104
NS7520 DRAM address multiplexing.................................................105
Using the internal multiplexer................................................105
Using the external multiplexer............................................... 108
DRAM refresh...........................................................................109
FP/EDO DRAM controller .............................................................109
Single cycle read/write........................................................110
FP/EDO DRAM burst cycles...... ..............................................111
SDRAM ...................................................................................111
NS7520 SDRAM interconnect ..................................................112
SDRAM A10/AP support ........................................................116
Command definitions...........................................................117
Memory timing fields — SDRAM............................................. ..118
BSIZE configuration.............................................................118
SDRAM Mode register...........................................................119