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Chapter 31 External Bus
1.Overview of the External Bus Interface
Chapter 31 External Bus
The external bus interface controller controls the interfaces with the internal bus for chips and
with external memory and I/O devices.
This chapter explains each function of the external bus interface and its operation.
1. Overview of the External Bus Interface
1.1 Features
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The external bus interface has the following features:
• Addresses of up to 32 bits (4 GB space) can be output.
• Various kinds of external memory (8-bit/16-bit/32-bit modules) can be directly connected and multiple
access timings can be mixed and controlled.
• Asynchronous SRAM and asynchronous ROM/FLASH memory (multiple write strobe method or byte enable
method)
• Page mode ROM/FLASH memory (Page sizes 2, 4, and 8 can be used)
• Burst mode ROM/FLASH memory (such as MBM29BL160D/161D/162D)
• Address/data multiplex bus (8-bit/16-bit width only)
• SDRAM (FCRAM modules are also supported, including two - and four - bank types with CAS latency 1 to 8)
• Synchronous memory (such as ASIC built-in memory) (Synchronous SRAM cannot be directly connected)
• Eight independent banks (chip select areas) can be set, and chip select corresponding to each bank can be
output.
• The size of each area can be set in multiples of 64 KB (64 KB to 2 GB for each chip select area).
• An area can be set at any location in the logical address space (Boundaries may be limited depending on
the size of the area.)
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In each chip select area, the following functions can be set independently:
• Enabling and disabling of the chip select area (Disabled areas cannot be accessed)
• Setting of the access timing type to support various kinds of memory
• Detailed access timing setting (individual setting of the access type such as the wait cycle)
• Setting of the data bus width (8-bit/16-bit)
• Setting of the order of bytes (big or little endian) (Only big endian can be set for the CS0 area)
• Setting of write disable (read-only area)
• Enabling and disabling of fetches from the built-in cache
• Enabling and disabling of the prefetch function
• Maximum burst length setting (1, 2, 4, 8)
●
A different detailed timing can be set for each access timing type.
• For the same type of access timing, a different setting can be made in each chip select area.
• Auto-wait can be set to up to 15 cycles (asynchronous SRAM, ROM, Flash, and I/O area).
• The bus cycle can be extended by external RDY input (asynchronous SRAM, ROM, Flash, and I/O area).
• The first access wait and page wait can be set (burst, page mode, and ROM/FLASH area).
• Various kinds of idle/recovery cycles and setting delays can be inserted.
Summary of Contents for FR Family FR60 Lite
Page 2: ...FUJITSU LIMITED ...
Page 3: ...FR60 32 BIT MICROCONTROLLER MB91460 Series User s Manual ...
Page 15: ...xi ...
Page 16: ...xii ...
Page 38: ...22 Chapter 2 MB91460 Rev A Rev B Overview 4 Block Diagram ...
Page 128: ...112 Chapter 4 CPU Architecture 9 Addressing ...
Page 153: ...137 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 154: ...138 Chapter 8 Device State Transition 3 State Transition Diagram ...
Page 169: ...153 Chapter 9 Reset 10 Caution ...
Page 170: ...154 Chapter 9 Reset 10 Caution ...
Page 180: ...164 Chapter 10 Standby 7 Q A ...
Page 182: ...166 Chapter 10 Standby 8 Caution ...
Page 199: ...183 Chapter 12 Instruction Cache 2 Main body structure Figure 2 3 I Cache Address Map ...
Page 200: ...184 Chapter 12 Instruction Cache 2 Main body structure Figure 2 4 I Cacheable Area ...
Page 222: ...206 Chapter 13 Clock Control 8 Caution ...
Page 232: ...216 Chapter 14 PLL Interface 7 Caution ...
Page 236: ...220 Chapter 15 CAN Clock Prescaler 3 Registers ...
Page 288: ...272 Chapter 19 Timebase Timer 8 Caution ...
Page 314: ...298 Chapter 22 Main Oscillation Stabilisation Timer 8 Caution ...
Page 326: ...310 Chapter 23 Sub Oscillation Stabilisation Timer 8 Caution ...
Page 348: ...332 Chapter 25 External Interrupt 8 Caution ...
Page 398: ...382 Chapter 26 DMA Controller 6 DMA External Interface ...
Page 402: ...386 Chapter 27 Delayed Interrupt 8 Caution ...
Page 412: ...396 Chapter 28 Bit Search 8 Caution ...
Page 521: ...505 Chapter 30 I O Ports 3 Port Register Settings ...
Page 522: ...506 Chapter 30 I O Ports 3 Port Register Settings ...
Page 574: ...558 Chapter 31 External Bus 4 Endian and Bus Access Byte Access ...
Page 628: ...612 Chapter 31 External Bus 13 Notes on Using the External Bus Interface ...
Page 706: ...690 Chapter 33 I2C Controller 4 Programming Flow Charts ...
Page 748: ...732 Chapter 34 CAN Controller 4 CAN Application ...
Page 762: ...746 Chapter 35 Free Run Timer 8 Caution ...
Page 790: ...774 Chapter 37 Output Compare 8 Caution ...
Page 838: ...822 Chapter 39 Programmable Pulse Generator 8 Caution ...
Page 850: ...834 Chapter 40 Pulse Frequency Modulator 4 PFM Operation and Setting ...
Page 886: ...870 Chapter 42 Sound Generator 3 Registers ...
Page 900: ...884 Chapter 43 Stepper Motor Controller 4 Caution ...
Page 939: ...923 Chapter 47 LCD Controller 3 Configuration Figure 3 2 Register List ...
Page 943: ...927 Chapter 47 LCD Controller 4 Registers Correspondence between VRAM and Common Segment Pins ...
Page 964: ...948 Chapter 48 Clock Monitor 8 Caution ...
Page 994: ...978 Chapter 51 Low Voltage Reset Interrupt 3 Registers ...
Page 998: ...982 Chapter 52 Regulator Control 3 Registers ...
Page 1008: ...992 Chapter 53 Fixed Mode Reset Vector BOOT ROM 5 Bootloader Update Strategy ...
Page 1024: ...1008 Chapter 54 Flash Memory 8 Caution ...
Page 1032: ...1016 Chapter 55 Flash Security 4 Register ...
Page 1034: ...1018 Chapter 56 Electrical Specification ...
Page 1035: ...FR60 MB91460 Series Hardware Manual European Microcontroller Design Centre Author MBo ...
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