II CORE BLOCK: BCU (Bus Control Unit)
S1C33L03 FUNCTION PART
EPSON
B-II-4-3
A-1
B-II
BCU
Combination of System Bus Control Signals
The bus control signal pins that have two or more functions have their functionality determined when an interface
method is selected by a program. The BCU contains an ordinary external system interface (two interface method
are supported) and a DRAM interface.
Table 4.3 Interface Selection
Interface type
Interface method
Control bit
External system interface
A0 system (default)
SBUSST(D3/0x4812E) = "0"
#BSL system
SBUSST(D3/0x4812E) = "1"
DRAM interface
2CAS system (fixed)
None
SBUSST is initialized to "0" at cold start.
When the IC is hot-started, these bits retain their status before the chip was reset.
Table 4.4 shows combinations of control signals classified by each interface method.
Table 4.4 Combinations of Bus Control Signals
External system interface
DRAM interface
A0 system
#BSL system
2CAS system
A0
#BSL (little endian) /
#BSH (big endian)
∗
1
–
#WRL
#WR
#WE
#WRH
#BSH (little endian) /
#BSL (big endian)
∗
1
–
–
–
#HCAS
–
–
#LCAS
#CEx
#CEx
#RASx
∗
2
∗
1 In the #BSL system, the A0 and #WRH pin functions change according to the endian selected (little endian
or big endian).
∗2
When using DRAM, the #CE output pins in areas 7–8 (areas 13–14) function as the #RAS1–2 (#RAS3–4)
pins.
Summary of Contents for CMOS 32-Bit Single Chip Microcomputer S1C33L03
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Page 163: ...S1C33L03 FUNCTION PART II CORE BLOCK ...
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Page 176: ...II CORE BLOCK INITIAL RESET B II 3 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
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Page 263: ...S1C33L03 FUNCTION PART III PERIPHERAL BLOCK ...
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Page 493: ...S1C33L03 FUNCTION PART VI SDRAM CONTROLLER BLOCK ...
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