II CORE BLOCK: BCU (Bus Control Unit)
B-II-4-28
EPSON
S1C33L03 FUNCTION PART
DRAM Read/Write Cycles
The following shows the basic bus cycles of DRAM.
The DRAM interface does not accept wait cycles inserted via the #WAIT pin.
DRAM random read cycle
Example: RAS: 1 cycle; CAS: 2 cycles; Precharge: 1 cycle
BCLK
A[11:0]
#RASx
#HCAS/
#LCAS
#RD
D[15:0]
;;;;;;;
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;;;;;;;;;;;;;
;;;;;;;;;;;;;
;;;;
;;;;
ROW
COL
data
RAS cycle
CAS cycle
Precharge
cycle
Figure 4.29 DRAM Random Read Cycle
DRAM read cycle (fast page mode)
Example: RAS: 1 cycle; CAS: 2 cycles; Precharge: 1 cycle
BCLK
A[11:0]
#RASx
#HCAS/
#LCAS
#RD
D[15:0]
;;;;;;;
;;;;;;;
;;;;;;;;;;;;;
;;;;;;;;;;;;;
;;;;;;;;;
;;;;;;;;;
ROW
COL #1
COL #2
data
;;;;
;;;;
data
RAS cycle
CAS cycle #1
CAS cycle #2
Precharge
cycle
Figure 4.30 DRAM Read Cycle (fast page mode)
DRAM read cycle (EDO page mode)
Example: RAS: 1 cycle; CAS: 2 cycles; Precharge: 1 cycle
BCLK
A[11:0]
#RASx
#HCAS/
#LCAS
#RD
D[15:0]
;;;;;;;
;;;;;;;
;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;
;;;;;;;;;
;;;;;;;;;
ROW
COL #1
COL #2
data
;;
;;
data
RAS cycle
CAS cycle #1
CAS cycle #2
Precharge
cycle
Figure 4.31 DRAM Read Cycle (EDO page mode)
The read timing in EDO page-mode lags 0.5 cycles behind that in fast page mode.
Summary of Contents for CMOS 32-Bit Single Chip Microcomputer S1C33L03
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Page 15: ...S1C33L03 PRODUCT PART ...
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Page 149: ...S1C33L03 FUNCTION PART I OUTLINE ...
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Page 152: ...I OUTLINE INTRODUCTION B I 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 162: ...I OUTLINE LIST OF PINS B I 3 8 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 163: ...S1C33L03 FUNCTION PART II CORE BLOCK ...
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Page 166: ...II CORE BLOCK INTRODUCTION B II 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 172: ...II CORE BLOCK CPU AND OPERATING MODE B II 2 6 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 176: ...II CORE BLOCK INITIAL RESET B II 3 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 224: ...II CORE BLOCK BCU Bus Control Unit B II 4 48 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 262: ...II CORE BLOCK DBG Debug Unit B II 7 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 263: ...S1C33L03 FUNCTION PART III PERIPHERAL BLOCK ...
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Page 266: ...III PERIPHERAL BLOCK INTRODUCTION B III 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 322: ...III PERIPHERAL BLOCK WATCHDOG TIMER B III 5 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 415: ...S1C33L03 FUNCTION PART IV ANALOG BLOCK ...
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Page 434: ...IV ANALOG BLOCK A D CONVERTER B IV 2 16 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 435: ...S1C33L03 FUNCTION PART V DMA BLOCK ...
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Page 492: ...V DMA BLOCK IDMA Intelligent DMA B V 3 18 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Page 493: ...S1C33L03 FUNCTION PART VI SDRAM CONTROLLER BLOCK ...
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Page 531: ...S1C33L03 FUNCTION PART VII LCD CONTROLLER BLOCK ...
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Page 579: ...S1C33L03 FUNCTION PART Appendix I O MAP ...
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