Renesas H8S Series Hardware Manual page 16

6.4.5 Wait Control ................................................................................................................................................136
6.5 DRAM Interface....................................................................................................................................................... 138
6.5.1 Overview ..................................................................................................................................................... 138
6.5.2 Setting DRAM Space ..................................................................................................................................138
6.5.3 Address Multiplexing ..................................................................................................................................138
6.5.4 Data Bus ......................................................................................................................................................138
6.5.5 Pins Used for DRAM Interface ................................................................................................................... 139
6.5.6 Basic Timing ............................................................................................................................................... 140
6.5.7 Precharge State Control............................................................................................................................... 141
6.5.8 Wait Control ................................................................................................................................................141
6.5.9 Byte Access Control ....................................................................................................................................143
6.5.10 Burst Operation ........................................................................................................................................... 144
6.5.11 Refresh Control ........................................................................................................................................... 147
6.6 DMAC Single Address Mode and DRAM Interface................................................................................................149
6.6.1 When DDS = 1 ............................................................................................................................................149
6.6.2 When DDS = 0 ............................................................................................................................................150
6.7 Burst ROM Interface ................................................................................................................................................150
6.7.1 Overview ..................................................................................................................................................... 150
6.7.2 Basic Timing ............................................................................................................................................... 151
6.7.3 Wait Control ................................................................................................................................................152
6.8 Idle Cycle..................................................................................................................................................................153
6.8.1 Operation ..................................................................................................................................................... 153
6.8.2 Usage Notes................................................................................................................................................. 155
6.8.3 Pin States in Idle Cycle ............................................................................................................................... 157
6.9 Write Data Buffer Function ......................................................................................................................................158
6.10 Bus Release............................................................................................................................................................... 159
6.10.1 Overview ..................................................................................................................................................... 159
6.10.2 Operation ..................................................................................................................................................... 159
6.10.3 Pin States in External Bus Released State................................................................................................... 160
6.10.4 Transition Timing........................................................................................................................................161
6.10.5 Usage Note ..................................................................................................................................................161
6.11 Bus Arbitration ......................................................................................................................................................... 162
6.11.1 Overview ..................................................................................................................................................... 162
6.11.2 Operation ..................................................................................................................................................... 162
6.11.3 Bus Transfer Timing ................................................................................................................................... 163
6.11.4 External Bus Release Usage Note ............................................................................................................... 163
6.12 Resets and the Bus Controller................................................................................................................................... 164
Section 7 DMA Controller................................................................................................................165
7.1 Overview................................................................................................................................................................... 165
7.1.1 Features ....................................................................................................................................................... 165
7.1.2 Block Diagram............................................................................................................................................. 166
7.1.3 Overview of Functions ................................................................................................................................167
7.1.4 Pin Configuration ........................................................................................................................................169
7.1.5 Register Configuration ................................................................................................................................170
7.2 Register Descriptions (1) (Short Address Mode) ..................................................................................................... 171
7.2.1 Memory Address Registers (MAR)............................................................................................................. 172
7.2.2 I/O Address Register (IOAR)......................................................................................................................172
7.2.3 Execute Transfer Count Register (ETCR)................................................................................................... 173
7.2.4 DMA Control Register (DMACR)..............................................................................................................174
7.2.5 DMA Band Control Register (DMABCR)..................................................................................................177
7.3 Register Descriptions (2) (Full Address Mode) ....................................................................................................... 181
Rev.6.00 Oct.28.2004 page xii of xxiv
REJ09B0138-0600H