VI SDRAM CONTROLLER BLOCK: SDRAM INTERFACE
B-VI-2-28
EPSON
S1C33L03 FUNCTION PART
SDRIS: Initial command sequence (D4) / SDRAM control register (0x39FFC1)
Select the SDRAM initialization sequence.
Write "1": 1. Precharge
→
2. Mode Register Set
→
3. Refresh
Write "0": 1. Precharge
→
2. Refresh
→
3. Mode Register Set
Read: Valid
In accordance with the specifications of the SDRAM, select a sequence to determine the order the commands are
sent to initialize the SDRAM. Initialization of the SDRAM is initiated by writing "1" to SDRINI (D6/0x39FFC1).
At cold start, SDRIS is set to "0" (1. Precharge
→
2. Refresh
→
3. Mode Register Set). At hot start, SDRIS retains
its status before being initialized.
SDRCLK: Keep SDRAM clock during self-refresh (D3) / SDRAM control register (0x39FFC1)
Select whether or not to stop the SDRAM clock during self-refresh.
Write "1": Kept outputting
Write "0": Stopped
Read: Valid
Writing "0" to SDRCLK causes the SDRAM clock output from the BCLK pin to stop and to remain off while the
SDRAM is self-refreshed. This helps to reduce the chip's current consumption. Note that when the bus is released,
the BCLK pin goes into a high-impedance state.
If SDRCLK = "1", the SDRAM clock is always output from the BCLK pin even while the SDRAM is self-
refreshed or the bus is released.
At cold start, SDRCLK is set to "1" (kept outputting). At hot start, SDRCLK retains its status before being
initialized.
SDRCA1–SDRCA0: SDRAM page size (D[6:5]) / SDRAM address configuration register (0x39FFC2)
Set the SDRAM page size (column addressing range).
Table 2.15 Setting Column Addressing Range (Page Size)
SDRCA1
SDRCA0
Column size
Column address (pin) used
0
0
256
SDA0–SDA7 (default)
0
1
512
SDA0–SDA8
1
0
1,024
SDA0–SDA9
1
1
–
–
The contents set here are applied to all of areas 7, 8, 13, and 14 that are set for SDRAM.
SDRCA can be read to obtain its set value.
At cold start, SDRCA is set to "0" (256). At hot start, SDRCA retain its status before being initialized.
SDRRA1–SDRRA0:
SDRAM row addressing range (D[3:2]) / SDRAM address configuration register (0x39FFC2)
Set the SDRAM row addressing range.
Table 2.16 Setting Row Addressing Range
SDRRA1
SDRRA0
Row size
Row address (pin) used
0
0
2K
SDA0–SDA10 (default)
0
1
4K
SDA0–SDA11
1
0
8K
SDA0–SDA12
1
1
–
–
The contents set here are applied to all of areas 7, 8, 13, and 14 that are set for SDRAM.
SDRRA can be read to obtain its set value.
At cold start, SDRRA is set to "0" (2K). At hot start, SDRRA retain its status before being initialized.
Summary of Contents for CMOS 32-Bit Single Chip Microcomputer S1C33L03
Page 4: ......
Page 14: ......
Page 15: ...S1C33L03 PRODUCT PART ...
Page 16: ......
Page 147: ...S1C33L03 FUNCTION PART ...
Page 148: ......
Page 149: ...S1C33L03 FUNCTION PART I OUTLINE ...
Page 150: ......
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 ...
Page 164: ......
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 ...
Page 264: ......
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 ...
Page 416: ......
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 ...
Page 436: ......
Page 438: ...V DMA BLOCK INTRODUCTION B V 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
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 ...
Page 494: ......
Page 531: ...S1C33L03 FUNCTION PART VII LCD CONTROLLER BLOCK ...
Page 532: ......
Page 579: ...S1C33L03 FUNCTION PART Appendix I O MAP ...
Page 580: ......