iv
8.2.2 Wait State Control Register 1 (WCR1)................................................................. 109
8.2.3 Wait State Control Register 2 (WCR2)................................................................. 111
8.2.4 Wait State Control Register 3 (WCR3)................................................................. 113
8.2.5 DRAM Area Control Register (DCR) .................................................................. 114
8.2.6 Refresh Control Register (RCR) ........................................................................... 117
8.2.7 Refresh Timer Control/Status Register (RTCSR)................................................. 118
8.2.8 Refresh Timer Counter (RTCNT)......................................................................... 120
8.2.9 Refresh Time Constant Register (RTCOR) .......................................................... 120
8.2.10 Parity Control Register (PCR) .............................................................................. 121
8.2.11 Notes on Register Access...................................................................................... 123
8.3 Address Space Subdivision................................................................................................ 124
8.3.1 Address Spaces and Areas .................................................................................... 124
8.3.2 Bus Width.............................................................................................................. 126
8.3.3 Chip Select Signals (CS0–CS7)............................................................................ 126
8.3.4 Shadows ................................................................................................................ 127
8.3.5 Area Descriptions.................................................................................................. 129
8.4 Accessing External Memory Space.................................................................................... 136
8.4.1 Basic Timing ......................................................................................................... 136
8.4.2 Wait State Control................................................................................................. 138
8.4.3 Byte Access Control.............................................................................................. 141
8.5 DRAM Interface Operation................................................................................................ 142
8.5.1 DRAM Address Multiplexing............................................................................... 142
8.5.2 Basic Timing ......................................................................................................... 144
8.5.3 Wait State Control................................................................................................. 146
8.5.4 Byte Access Control.............................................................................................. 148
8.5.5 DRAM Burst Mode............................................................................................... 150
8.5.6 Refresh Control ..................................................................................................... 155
8.6 Address/Data Multiplexed I/O Space Access .................................................................... 159
8.6.1 Basic Timing ......................................................................................................... 159
8.6.2 Wait State Control................................................................................................. 160
8.6.3 Byte Access Control.............................................................................................. 160
8.7 Parity Check and Generation.............................................................................................. 161
8.8 Warp Mode......................................................................................................................... 162
8.9 Wait State Control.............................................................................................................. 163
8.10 Bus Arbitration................................................................................................................... 166
8.10.1 Operation of Bus Arbitration ................................................................................ 167
8.10.2 BACK Operation................................................................................................... 168
8.11 Usage Notes........................................................................................................................ 169
8.11.1 Usage Notes on Manual Reset .............................................................................. 169
8.11.2 Usage Notes on Parity Data Pins DPH and DPL.................................................. 172
8.11.3 Maximum Number of States from BREQ Input to Bus Release.......................... 172
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