AM1707_1008 Datasheet, PDF (76/199 Pages) Texas Instruments – ARM Microprocessor

AM1707
SPRS637A – FEBRUARY 2010 – REVISED APRIL 2010
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6.12.1 Interfacing to SDRAM
The EMIFB supports a glueless interface to SDRAM devices with the following characteristics:
• Pre-charge bit is A[10]
• Supports 8, 9, 10 or 11 column address bits
• Supports up to 13 row address bits
• Supports 1, 2 or 4 internal banks
Table 6-24 shows the supported SDRAM configurations for EMIFB.
Table 6-24. EMIFB Supported SDRAM Configurations⁽¹⁾
SDRAM
Memory
Data Bus
Width
(bits)
Number of EMIFB Data
Memories Bus Size
Rows
Columns
Banks
Total Memory
(Mbits)
Total Memory
(Mbytes)
Memory
Density
(Mbits)
1
32
13
8
1
64
8
64
1
32
13
8
2
128
16
128
1
32
13
8
4
256
32
256
1
32
13
9
1
128
16
128
1
32
13
9
2
256
32
256
1
32
13
9
4
32
1
32
13
10
1
512
64
512
256
32
256
1
32
13
10
2
512
64
512
1
32
13
10
4
1024
128
1024
1
32
13
11
1
512
64
512
1
32
13
11
2
1024
128
1024
1
32
13
11
4
2048
256
2048
2
32
13
8
1
64
8
32
2
32
13
8
2
128
16
64
2
32
13
8
4
256
32
128
2
32
13
9
1
128
16
64
2
32
13
9
2
256
32
128
2
32
13
9
4
16
2
32
13
10
1
512
64
256
256
32
128
2
32
13
10
2
512
64
256
2
32
13
10
4
1024
128
512
2
32
13
11
1
512
64
256
2
32
13
11
2
1024
128
512
2
32
13
11
4
2048
256
1024
(1) The shaded cells indicate configurations that are possible on the EMIFB interface but as of this writing SDRAM memories capable of
supporting these densities are not available in the market.
Figure 6-21 shows an interface between the EMIFB and a 2M × 16 × 4 bank SDRAM device. In addition,
Figure 6-22 shows an interface between the EMIFB and a 2M × 32 × 4 bank SDRAM device and
Figure 6-23 shows an interface between the EMIFB and two 4M × 16 × 4 bank SDRAM devices. Refer to
Table 6-25 , as an example that shows additional list of commonly-supported SDRAM devices and the
required connections for the address pins. Note that in Table 6-25, page size/column size (not indicated in
the table) is varied to get the required addressability range.
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Peripheral Information and Electrical Specifications
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