II CORE BLOCK: BCU (Bus Control Unit)
S1C33L03 FUNCTION PART
EPSON
B-II-4-19
A-1
B-II
BCU
Bus Cycles in External System Interface
The following shows a sample SRAM connection the basic bus cycles.
A[9:1]
D[15:0]
#RD
#WRH
#WRL
#CE
S1C33
(1) A0 system (little endian/big endian)
A[8:0]
I/O[15:0]
#RD
#WRH
#WRL
#CE
SRAM
A[9:1]
D[15:0]
A0
#WRH
#WRL
#CE
#RD
S1C33
(2) #BSL system (little endian)
A[8:0]
I/O[15:0]
#LB
#UB
#WE
#OS
#OE
SRAM
A[9:1]
D[15:0]
A0
#WRH
#WRL
#CE
#RD
S1C33
(3) #BSL system (big endian)
A[8:0]
I/O[15:0]
#LB
#UB
#WE
#OS
#OE
SRAM
Figure 4.18 Sample DRAM Connection
SRAM Read Cycles
Basic read cycle with no wait mode
BCLK
A[23:0]
#CExx
D[15:0]
#RD
#WAIT
;;;
;;;
;;
;;
addr
data
C1
Figure 4.19 Basic Read Cycle with No Wait
Read cycle with wait mode
Example: When the BCU has no internal wait mode and 2 wait cycles via #WAIT pin are inserted
;;;;;;
;;;;;;
;;;;;
;;;;;
;;;;;
;;;;;
;;;;;
;;;;;
BCLK
A[23:0]
#CExx
D[15:0]
#RD
#WAIT
C1
CW
CW
;;;
;;;
;;;;;;;;;;;;;;
;;;;;;;;;;;;;;
addr
data
Figure 4.20 Read Cycle with Wait
The #WAIT signal is sampled at the falling edge of the transition of BCLK (bus clock) and when it is
sampled on an inactive (high level), the read cycle is terminated.
Note: Insertion of wait cycles via the #WAIT pin is possible only when the device for bus conditions is set
for SRAM, and SWAITE (D0) / Bus control register (0x4812E) is enabled for waiting.
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 147: ...S1C33L03 FUNCTION PART ...
Page 148: ......
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 418: ...IV ANALOG BLOCK INTRODUCTION B IV 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
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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