2 32-bit sdram, Not used a12, a15) – Rainbow Electronics AT91CAP9S250A User Manual
Page 158
158
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
21.6.2
32-bit SDRAM
21.6.2.1
Hardware Configuration
21.6.2.2
Software Configuration
The following configuration has to be performed:
• Assign the EBI CS1 to the SDRAM controller by setting the bit EBI_CS1A in the EBI Chip
Select Assignment Register located in the bus matrix memory space.
• Initialize the SDRAM Controller depending on the SDRAM device and system bus
frequency.
The Data Bus Width is to be programmed to 32 bits. The data lines D[16..31] are multiplexed
with PIO lines and thus the dedicated PIOs must be programmed in peripheral mode in the
PIO controller.
The SDRAM initialization sequence is described in the “SDR-SDRAM device initialisation” part
of the DDRSDR-SDRAM controller.
D13
D18
D12
D22
D8
D7
D3
D28
D11
D26
D21
D2
D14
D4
D24
D0
D23
D27
D1
D19
D10
D31
D17
D25
D29
D16
D9
D20
D5
D30
D15
D6
A5
A16
A2
A11
A7
A4
A9
A14
A8
A1
A5
A2
A17
A13
A6
A3
A3
A10
A16
A10
A13
A8
A17
A6
A4
A14
A9
A7
A11
A0
RAS
CAS
SDA10
SDWE
SDCKE
SDCK
NBS3
NBS1
SDDRCS
D[0..31]
A[0..17]
RAS
CAS
SDWE
SDCKE
SDCK
SDA10
3V3
3V3
(NBS0)
(NBS2)
(Not used A12, A15)
C11 100NF
C11 100NF
C12 100NF
C12 100NF
C2
100NF
C2
100NF
C8
100NF
C8
100NF
C9
100NF
C9
100NF
C7
100NF
C7
100NF
C5
100NF
C5
100NF
U1
U1
A0
23
A1
24
A2
25
A3
26
A4
29
A5
30
A6
31
A7
32
A8
33
A9
34
A10
22
BA0
20
A12
36
DQ0
2
DQ1
4
DQ2
5
DQ3
7
DQ4
8
DQ5
10
DQ6
11
DQ7
13
DQ8
42
DQ9
44
DQ10
45
DQ11
47
DQ12
48
DQ13
50
DQ14
51
DQ15
53
VDD
1
VSS
28
VSS
41
VDDQ
3
VDD
27
N.C
40
CLK
38
CKE
37
DQML
15
DQMH
39
CAS
17
RAS
18
WE
16
CS
19
VDDQ
9
VDDQ
43
VDDQ
49
VSSQ
6
VSSQ
12
VSSQ
46
VSSQ
52
VDD
14
VSS
54
A11
35
BA1
21
C6
100NF
C6
100NF
C10 100NF
C10 100NF
U2
U2
A0
23
A1
24
A2
25
A3
26
A4
29
A5
30
A6
31
A7
32
A8
33
A9
34
A10
22
BA0
20
A12
36
DQ0
2
DQ1
4
DQ2
5
DQ3
7
DQ4
8
DQ5
10
DQ6
11
DQ7
13
DQ8
42
DQ9
44
DQ10
45
DQ11
47
DQ12
48
DQ13
50
DQ14
51
DQ15
53
VDD
1
VSS
28
VSS
41
VDDQ
3
VDD
27
N.C
40
CLK
38
CKE
37
DQML
15
DQMH
39
CAS
17
RAS
18
WE
16
CS
19
VDDQ
9
VDDQ
43
VDDQ
49
VSSQ
6
VSSQ
12
VSSQ
46
VSSQ
52
VDD
14
VSS
54
A11
35
BA1
21
C4
100NF
C4
100NF
C3
100NF
C3
100NF
C1
100NF
C1
100NF
C13 100NF
C13 100NF
C14 100NF
C14 100NF