VI SDRAM CONTROLLER BLOCK: SDRAM INTERFACE
S1C33L03 FUNCTION PART
EPSON
B-VI-2-9
A-1
B-VI
SDRAM
Selecting initialization sequence
The SDRAM command sequence that is run immediately after SDRAM power-up can be selected to suit the
specifications of the SDRAM used. For this setting, use the SDRIS (D4)/SDRAM control register
(0x39FFC1).
SDRIS = "0": 1. Precharge
→
2. Refresh
→
3. Mode Register Set
SDRIS = "1": 1. Precharge
→
2. Mode Register Set
→
3. Refresh
If no problems are incurred in either setting, SDRIS = "1" is recommended.
Burst length
The burst length can be selected using the SDRBL[1:0] (D[3:2])/SDRAM mode set-up register (0x39FFC3).
Table 2.9 Setting Burst Length
SDRBL1
SDRBL0
Burst length (word)
0
0
1
0
1
2
1
0
4
1
1
8 (default)
Notes:
• Burst transfers are effective only when reading data from SDRAM. When writing to SDRAM,
data are always written in a single operation, not in bursts, no matter what burst length is
selected.
• The SDRAM controller is designed in such a way that when one cycle of burst read is finished,
it automatically issues the READ command to continue with transfers. Therefore, unless
SDRBL[1:0] = "00", the speed at which SDRAM is accessed does not vary with the burst length
involved.
Setting CAS latency
The CAS latency is defined by the number of clock cycles before data is output from SDRAM after issuing
the READ command and this SDRAM controller supports only 2 clocks of CAS latency. Set the SDRCL[1:0]
(D[6:5])/SDRAM mode set-up register (0x39FFC3) to "10" (CAS latency = 2) before accessing the SDRAM.
BCLK
Command
SDCKE
#SDCEx
#SDRAS
#SDCAS
#SDWE
SDBA[1:0]
SDA[12:0]
DQ[15:0]
ACTV
NOP
NOP
NOP
READ
BA
BA
ROW
COL
DATA
t
RCD
CAS latency = 2
Figure 2.5 CAS Latency
Содержание CMOS 32-Bit Single Chip Microcomputer S1C33L03
Страница 4: ......
Страница 14: ......
Страница 15: ...S1C33L03 PRODUCT PART ...
Страница 16: ......
Страница 147: ...S1C33L03 FUNCTION PART ...
Страница 148: ......
Страница 149: ...S1C33L03 FUNCTION PART I OUTLINE ...
Страница 150: ......
Страница 152: ...I OUTLINE INTRODUCTION B I 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 162: ...I OUTLINE LIST OF PINS B I 3 8 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 163: ...S1C33L03 FUNCTION PART II CORE BLOCK ...
Страница 164: ......
Страница 166: ...II CORE BLOCK INTRODUCTION B II 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 172: ...II CORE BLOCK CPU AND OPERATING MODE B II 2 6 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 176: ...II CORE BLOCK INITIAL RESET B II 3 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 224: ...II CORE BLOCK BCU Bus Control Unit B II 4 48 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 250: ...II CORE BLOCK ITC Interrupt Controller B II 5 26 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 262: ...II CORE BLOCK DBG Debug Unit B II 7 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 263: ...S1C33L03 FUNCTION PART III PERIPHERAL BLOCK ...
Страница 264: ......
Страница 266: ...III PERIPHERAL BLOCK INTRODUCTION B III 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 292: ...III PERIPHERAL BLOCK 8 BIT PROGRAMMABLE TIMERS B III 3 18 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 318: ...III PERIPHERAL BLOCK 16 BIT PROGRAMMABLE TIMERS B III 4 26 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 322: ...III PERIPHERAL BLOCK WATCHDOG TIMER B III 5 4 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 414: ...III PERIPHERAL BLOCK INPUT OUTPUT PORTS B III 9 26 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 415: ...S1C33L03 FUNCTION PART IV ANALOG BLOCK ...
Страница 416: ......
Страница 418: ...IV ANALOG BLOCK INTRODUCTION B IV 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 434: ...IV ANALOG BLOCK A D CONVERTER B IV 2 16 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 435: ...S1C33L03 FUNCTION PART V DMA BLOCK ...
Страница 436: ......
Страница 438: ...V DMA BLOCK INTRODUCTION B V 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 492: ...V DMA BLOCK IDMA Intelligent DMA B V 3 18 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 493: ...S1C33L03 FUNCTION PART VI SDRAM CONTROLLER BLOCK ...
Страница 494: ......
Страница 496: ...VI SDRAM CONTROLLER BLOCK INTRODUCTION B VI 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 531: ...S1C33L03 FUNCTION PART VII LCD CONTROLLER BLOCK ...
Страница 532: ......
Страница 534: ...VII LCD CONTROLLER BLOCK INTRODUCTION B VII 1 2 EPSON S1C33L03 FUNCTION PART THIS PAGE IS BLANK ...
Страница 579: ...S1C33L03 FUNCTION PART Appendix I O MAP ...
Страница 580: ......