II CORE BLOCK: BCU (Bus Control Unit)
B-II-4-44
EPSON
S1C33L03 FUNCTION PART
CRAS: Successive RAS mode (D8) / DRAM timing set-up register (0x48130)
Set the successive RAS mode.
Write "1": Successive RAS mode
Write "0": Normal mode
Read: Valid
In systems using DRAM, the successive RAS mode is entered by writing "1" to CRAS. In this mode, read/write
operations can be performed in page mode even when DRAM accesses do not occur back-to-back.
When using the successive RAS mode, be sure to use #DRD for the read signal and #DWE for the write signal for
low-byte.
When CRAS = "0", random read/write cycles are used for non-successive DRAM accesses.
The contents set here are applied to all of areas 14, 13, 8, and 7 that are set for DRAM.
At cold start, CRAS is set to "0" (normal mode). At hot start, CRAS retains its status before being initialized.
RPRC1–RPRC0: Number of RAS precharge cycles (D[7:6]) / DRAM timing set-up register (0x48130)
Select the number of precharge cycles during a DRAM access.
Table 4.29 Number of RAS Precharge Cycles
RPRC1
RPRC0
Number of cycles
1
1
4 cycles
1
0
3 cycles
0
1
2 cycles
0
0
1 cycle
The contents set here are applied to all of areas 14, 13, 8, and 7 that are set for DRAM.
At cold start, RPRC is set to "0" (1 cycle). At hot start, RPRC retains its status before being initialized.
CASC1–CASC0: Number of CAS cycles (D[4:3]) / DRAM timing set-up register (0x48130)
Select the number of CAS cycles during a DRAM access.
Table 4.30 Number of CAS Cycles
CASC1
CASC0
Number of cycles
1
1
4 cycles
1
0
3 cycles
0
1
2 cycles
0
0
1 cycle
The contents set here are applied to all of areas 14, 13, 8, and 7 that are set for DRAM.
At cold start, CASC is set to "0" (1 cycle). At hot start, CASC retains its status before being initialized.
RASC1–RASC0: Number of RAS cycles (D[1:0]) / DRAM timing set-up register (0x48130)
Select the number of RAS cycles during a DRAM access.
Table 4.31 Number of RAS Cycles
RASC1
RASC0
Number of cycles
1
1
4 cycles
1
0
3 cycles
0
1
2 cycles
0
0
1 cycle
The contents set here are applied to all of areas 14, 13, 8, and 7 that are set for DRAM.
At cold start, RASC is set to "0" (1 cycle). At hot start, RASC retains its status before being initialized.
Summary of Contents for CMOS 32-Bit Single Chip Microcomputer S1C33L03
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