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External Memory Controller
External Address Pin, A[14:0]
AHB Address To Row Address
AHB Address To Column Address
External Address Pin, A[14:0]
AHB Address To Row Address
AHB Address To Column Address
External Address Pin, A[14:0]
AHB Address To Row Address
AHB Address To Column Address
External Address Pin, A[14:0]
AHB Address To Row Address
AHB Address To Column Address
External Address Pin, A[14:0]
AHB Address To Row Address
AHB Address To Column Address
External Address Pin, A[14:0]
AHB Address To Row Address
AHB Address To Column Address
External Address Pin, A[14:0]
AHB Address To Row Address
AHB Address To Column Address
External Address Pin, A[14:0]
AHB Address To Row Address
AHB Address To Column Address
External Address Pin, A[14:0]
AHB Address To Row Address
AHB Address To Column Address
External Address Pin, A[14:0]
AHB Address To Row Address
AHB Address To Column Address
NOTE: **The EMC always transfers 32 bits of data in each transaction. For chip selects with a 16-bit wide
7-26
Table 7-8. 16-bit Wide Data Bus Address Mapping, SDRAM (BRC)
16-BIT WIDE DEVICE 16M SDRAM (1M × 16, BRC)
16-BIT WIDE DEVICE 16M SDRAM (2M × 8, BRC)
21/BA1
21/BA1
16-BIT WIDE DEVICE 64M SDRAM (4M × 16, BRC)
21/BA1
21/BA1
16-BIT WIDE DEVICE 64M SDRAM (8M × 8, BRC)
23/BA1
16-BIT WIDE DEVICE 128M SDRAM (8M × 16, BRC)
23/BA1
23/BA1
16-BIT WIDE DEVICE 128M SDRAM (16M × 8, BRC)
23/BA1
23/BA1
16-BIT WIDE DEVICE 256M SDRAM (16M × 16, BRC)
23/BA1
23/BA1
16-BIT WIDE DEVICE 256M SDRAM (32M × 8, BRC)
25/BA1
25/BA1
16-BIT WIDE DEVICE 512M SDRAM (32M × 16, BRC)
25/BA1
25/BA1
16-BIT WIDE DEVICE 512M SDRAM (64M × 8, BRC)
26/BA1
26/BA1
data bus, the EMC performs two transfers: 1) a column transfer with the lowest bit set to 0, and 2) a
column transfer with the lowest bit set to 1.
14
13
12
11
10
—
20/BA0
—
—
19
—
20
—
—
AP
14
13
12
11
10
—
—
—
20
—
—
—
AP
14
13
12
11
10
22/BA0
—
20
19
22/BA0
—
—
AP
14
13
12
11
10
22/BA0
—
21
20
23
22/BA0
—
—
AP
14
13
12
11
10
22/BA0
—
21
20
22/BA0
—
—
AP
14
13
12
11
10
24/BA0
—
22
21
24/BA0
—
—
AP
14
13
12
11
10
24/BA0
22
21
20
24/BA0
—
—
AP
14
13
12
11
10
24/BA0
23
22
21
24/BA0
—
—
AP
14
13
12
11
10
24/BA0
23
22
21
24/BA0
—
—
AP
14
13
12
11
10
25/BA0
24
23
22
25/BA0
—
11
AP
Version 1.0
LH79524/LH79525 User's Guide
9
8
7
6
5
4
18
17
16
15
14
13
12
–
–
8
7
6
5
9
8
7
6
5
4
19
18
17
16
15
14
13
–
9
8
7
6
5
9
8
7
6
5
4
18
17
16
15
14
13
12
—
—
8
7
6
5
9
8
7
6
5
4
19
18
17
16
15
14
13
—
9
8
7
6
5
9
8
7
6
5
4
19
18
17
16
15
14
13
—
9
8
7
6
5
9
8
7
6
5
4
20
19
18
17
16
15
14
10
9
8
7
6
5
9
8
7
6
5
4
19
18
17
16
15
14
13
—
9
8
7
6
5
9
8
7
6
5
4
20
19
18
17
16
15
14
10
9
8
7
6
5
9
8
7
6
5
4
20
19
18
17
16
15
14
10
9
8
7
6
5
9
8
7
6
5
4
21
20
19
18
17
16
15
10
9
8
7
6
5
3
2
1
0
11
10
9
4
3
2
**
3
2
1
0
12
11
10
4
3
2
**
3
2
1
0
11
10
9
4
3
2
**
3
2
1
0
12
11
10
4
3
2
**
3
2
1
0
12
11
10
4
3
2
**
3
2
1
0
13
12
11
4
3
2
**
3
2
1
0
12
11
10
4
3
2
**
3
2
1
0
13
12
11
4
3
2
**
3
2
1
0
13
12
11
4
3
2
**
3
2
1
0
14
13
12
4
3
2
**
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