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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