r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 492

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

Section 12 DDR-SDRAM Interface (DDRIF)
12.4.4
Initial value:
Initial value:
Initial value:
Initial value:
Rev. 1.00 Oct. 01, 2007 Page 426 of 1956
REJ09B0256-0100
Bit
1
0
R/W:
R/W:
R/W:
R/W:
Bit:
Bit:
Bit:
Bit:
DDR-SDRAM Row Attribute Register (SDR)
Bit Name
SRCD
SRP
63
47
31
15
R
R
R
R
0
0
0
0
62
46
30
14
R
R
R
R
0
0
0
0
Initial
Value
0
0
61
45
29
13
R
R
R
R
0
0
0
0
60
44
28
12
R
R
R
R
0
0
0
0
R/W
R/W
R/W
R/W
59
43
27
11
R
R
R
0
0
0
0
R/W
58
42
26
10
R
R
R
0
0
0
0
SPLIT
Description
Number of Cycles between RAS and CAS Commands
Specifies the number of cycles from RAS (ACT)
command issuance to CAS (READ/READA,
WRITE/WRITEA) command issuance (Trcd).
0: 3 cycles
1: 4 cycles
Number of Cycles between PRE and ACT Commands
Specifies the number of cycles from PRE command
issuance to ACT command issuance (Trp).
0: 3 cycles
1: 4 cycles
R/W
57
41
25
R
R
R
0
0
0
9
0
R/W
56
40
24
R
R
R
0
0
0
8
1
55
39
23
R
R
R
R
0
0
0
7
0
54
38
22
R
R
R
R
0
0
0
6
0
53
37
21
R
R
R
R
0
0
0
5
0
52
36
20
R
R
R
R
0
0
0
4
0
51
35
19
R
R
R
R
0
0
0
3
0
50
34
18
R
R
R
R
0
0
0
2
0
49
33
17
R
R
R
R
0
0
0
1
0
47
32
16
R
R
R
R
0
0
0
0
0