601
Chapter 31 External Bus
10.DMA Access Operation
Signal (CL = 2)
The rise of the IOWR signal can be delayed one cycle by extending SDRAM read access one cycle when the
signal resulting from OR (negative - logic AND) operation of the CAS signal and the chip select signal for the
SDRAM area subject to transfer is input t
As the external wait signal is generated based on the CAS signal rise timing in this case, the data setup time from
the SDRAM data output to the I/O device can be reserved for one cycle, regardless of a page hit or miss in
SDRAM.
Set the external wait using the RYE0 and RYE1 bits in the DMAC I/O wait register such that the RDY function of
the DMA fly - by access channel to be used is enabled.
When the CAS latency is 3, SDRAM data output is delayed one cycle. Add one stage of FF by the MCLK to input
the signal delayed one cycle from the above diagram to the RDY pin.
SDRAM basic access
I/O hold
wait
External RDY wait
I/O basic cycle
MCLK
A31 to 0
CSn
SRAS
SCAS
WRn(SWE)
MCLKE
D31 to 0
DACKn
DEOPn
IOWR
DREQn
RDY
Basic mode
Bank
Address
Column
Address
Row
Address
Содержание FR Family FR60 Lite
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Страница 154: ...138 Chapter 8 Device State Transition 3 State Transition Diagram ...
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Страница 170: ...154 Chapter 9 Reset 10 Caution ...
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Страница 232: ...216 Chapter 14 PLL Interface 7 Caution ...
Страница 236: ...220 Chapter 15 CAN Clock Prescaler 3 Registers ...
Страница 288: ...272 Chapter 19 Timebase Timer 8 Caution ...
Страница 314: ...298 Chapter 22 Main Oscillation Stabilisation Timer 8 Caution ...
Страница 326: ...310 Chapter 23 Sub Oscillation Stabilisation Timer 8 Caution ...
Страница 348: ...332 Chapter 25 External Interrupt 8 Caution ...
Страница 398: ...382 Chapter 26 DMA Controller 6 DMA External Interface ...
Страница 402: ...386 Chapter 27 Delayed Interrupt 8 Caution ...
Страница 412: ...396 Chapter 28 Bit Search 8 Caution ...
Страница 521: ...505 Chapter 30 I O Ports 3 Port Register Settings ...
Страница 522: ...506 Chapter 30 I O Ports 3 Port Register Settings ...
Страница 549: ...533 Chapter 31 External Bus 2 External Bus Interface Registers is set to the high impedance state ...
Страница 574: ...558 Chapter 31 External Bus 4 Endian and Bus Access Byte Access ...
Страница 628: ...612 Chapter 31 External Bus 13 Notes on Using the External Bus Interface ...
Страница 706: ...690 Chapter 33 I2C Controller 4 Programming Flow Charts ...
Страница 748: ...732 Chapter 34 CAN Controller 4 CAN Application ...
Страница 762: ...746 Chapter 35 Free Run Timer 8 Caution ...
Страница 790: ...774 Chapter 37 Output Compare 8 Caution ...
Страница 838: ...822 Chapter 39 Programmable Pulse Generator 8 Caution ...
Страница 850: ...834 Chapter 40 Pulse Frequency Modulator 4 PFM Operation and Setting ...
Страница 886: ...870 Chapter 42 Sound Generator 3 Registers ...
Страница 900: ...884 Chapter 43 Stepper Motor Controller 4 Caution ...
Страница 939: ...923 Chapter 47 LCD Controller 3 Configuration Figure 3 2 Register List ...
Страница 943: ...927 Chapter 47 LCD Controller 4 Registers Correspondence between VRAM and Common Segment Pins ...
Страница 964: ...948 Chapter 48 Clock Monitor 8 Caution ...
Страница 994: ...978 Chapter 51 Low Voltage Reset Interrupt 3 Registers ...
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Страница 1008: ...992 Chapter 53 Fixed Mode Reset Vector BOOT ROM 5 Bootloader Update Strategy ...
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Страница 1032: ...1016 Chapter 55 Flash Security 4 Register ...
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