at91sam9260-cj ATMEL Corporation, at91sam9260-cj Datasheet - Page 209

• Manufacturer Part Number: at91sam9260-cj
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

22.3.1.2
Table 22-5.
Table 22-6.
Table 22-7.
Notes:
22.4
22.4.1
6221G–ATARM–31-Jan-08
27
27
27
26
26
26
Bk[1:0]
1. M0 is the byte address inside a 16-bit half-word.
2. Bk[1] = BA1, Bk[0] = BA0.
Product Dependencies
25
25
25
SDRAM Device Initialization
Bk[1:0]
Bk[1:0]
16-bit Memory Data Bus Width
24
24
24
SDRAM Configuration Mapping: 2K Rows, 256/512/1024/2048 Columns
SDRAM Configuration Mapping: 4K Rows, 256/512/1024/2048 Columns
SDRAM Configuration Mapping: 8K Rows, 256/512/1024/2048 Columns
Bk[1:0]
Bk[1:0]
Bk[1:0]
23
23
23
Bk[1:0]
Bk[1:0]
Bk[1:0]
22
22
22
Bk[1:0]
Bk[1:0]
The initialization sequence is generated by software. The SDRAM devices are initialized by the
following sequence:
21
21
21
Bk[1:0]
1. SDRAM features must be set in the configuration register: asynchronous timings (TRC,
2. For mobile SDRAM, temperature-compensated self refresh (TCSR), drive strength
3. The SDRAM memory type must be set in the Memory Device Register.
4. A minimum pause of 200 µs is provided to precede any signal toggle.
5.
20
20
20
TRAS, etc.), number of columns, rows, CAS latency, and the data bus width.
(DS) and partial array self refresh (PASR) must be set in the Low Power Register.
(1)
1 in the Mode Register and perform a write access to any SDRAM address.
A NOP command is issued to the SDRAM devices. The application must set Mode to
19
19
19
Row[12:0]
Row[11:0]
18
18
18
Row[10:0]
Row[12:0]
Row[11:0]
17
17
17
Row[10:0]
Row[12:0]
Row[11:0]
16
16
16
Row[10:0]
Row[12:0]
Row[11:0]
15
15
15
CPU Address Line
CPU Address Line
CPU Address Line
Row[10:0]
14
14
14
13
13
13
12
12
12
11
11
11
10
10
10
9
9
9
8
8
8
7
7
7
Column[10:0]
Column[10:0]
Column[10:0]
Column[9:0]
Column[9:0]
Column[9:0]
6
6
6
Column[8:0]
Column[8:0]
Column[8:0]
AT91SAM9260
Column[7:0]
Column[7:0]
Column[7:0]
5
5
5
4
4
4
3
3
3
2
2
2
1
1
1
M0
M0
M0
M0
M0
M0
M0
M0
M0
M0
M0
M0
209
0
0
0