8.2.2
8.2.3
8.2.4
8.2.5
8.2.6
8.2.7
8.2.8
8.2.9
8.2.10 Parity Control Register (PCR).............................................................................. 112
8.2.11 Notes on Register Access..................................................................................... 114
Address Space Subdivision................................................................................................ 115
8.3.1
Address Spaces and Areas.................................................................................... 115
8.3.2
Bus Width............................................................................................................. 117
8.3.3
Chip Select Signals (
CS0
–
CS7
)............................................................................ 117
8.3.4
Shadows................................................................................................................ 118
8.3.5
Area Description .................................................................................................. 120
Accessing External Memory Space................................................................................... 128
8.4.1
Basic Timing........................................................................................................ 128
8.4.2
Wait State Control................................................................................................ 129
8.4.3
Byte Access Control............................................................................................. 133
DRAM Interface Operation............................................................................................... 134
8.5.1
DRAM Adress Multiplexing............................................................................... 134
8.5.2
Basic Timing........................................................................................................ 136
8.5.3
Wait State Control................................................................................................ 138
8.5.4
Byte Access Control............................................................................................. 140
8.5.5
DRAM Burst Mode.............................................................................................. 142
8.5.6
Refresh Control.................................................................................................... 148
Address/Data Multiplexed I/O Space Access.................................................................... 151
8.6.1
Basic Timing........................................................................................................ 152
8.6.2
Wait State Control................................................................................................ 153
8.6.3
Byte Access Control............................................................................................. 153
Parity Check and Generation............................................................................................. 154
Warp Mode........................................................................................................................ 154
Wait State Control ............................................................................................................. 155
Bus Arbitration.................................................................................................................. 157
8.10.1 The Operation of Bus Arbitration ........................................................................ 158
8.10.2
BACK
Operation.................................................................................................. 159
Usage Notes....................................................................................................................... 161
8.11.1 Usage Notes on Manual Reset.............................................................................. 161
8.11.2 Usage Notes on Parity Data Pins DPH and DPL ................................................. 164
8.11.3 Maximum Number of States from
BREQ
Input to Bus Release ......................... 164
Wait State Control Register 1 (WCR1)................................................................
Wait State Control Register 2 (WCR2)................................................................ 101
Wait State Control Register 3 (WCR3)................................................................ 103
DRAM Area Control Register (DCR).................................................................. 104
Refresh Control Register (RCR).......................................................................... 107
Refresh Timer Control/Status Register (RTCSR)................................................ 108
Refresh Timer Counter (RTCNT)........................................................................ 110
Refresh Time Constant Register (RTCOR).......................................................... 112
98
8.3
8.4
8.5
8.6
8.7
8.8
8.9
8.10
8.11
Section 9 Direct Memory Access Controller (DMAC)
............................................ 169