AM1707_1008 Datasheet, PDF (65/199 Pages) Texas Instruments – ARM Microprocessor

AM1707
www.ti.com
SPRS637A – FEBRUARY 2010 – REVISED APRIL 2010
Table 6-18. EMIFA Supported SDRAM Configurations⁽¹⁾
SDRAM
Memory
Data Bus
Width
(bits)
16
8
Number of EMIFB Data
Memories Bus Size
1
16
1
16
1
16
1
16
1
16
1
16
1
16
1
16
1
16
1
16
1
16
1
16
2
16
2
16
2
16
2
16
2
16
2
16
2
16
2
16
2
16
2
16
2
16
2
16
Rows
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
13
Columns
8
8
8
9
9
9
10
10
10
11
11
11
8
8
8
9
9
9
10
10
10
11
11
11
Banks
1
2
4
1
2
4
1
2
4
1
2
4
1
2
4
1
2
4
1
2
4
1
2
4
Total Memory
(Mbits)
32
64
128
64
128
256
128
256
512
256
512
1024
32
64
128
64
128
256
128
256
512
256
512
1024
Total Memory
(Mbytes)
4
8
16
8
16
32
16
32
64
32
64
128
4
8
16
8
16
32
16
32
64
32
64
128
Memory
Density
(Mbits)
32
64
128
64
128
256
128
256
512
256
512
1024
16
32
64
32
64
128
64
128
256
128
256
512
(1) The shaded cells indicate configurations that are possible on the EMIFA interface but as of this writing SDRAM memories capable of
supporting these densities are not available in the market.
6.11.3 EMIFA SDRAM Loading Limitations
EMIFA supports SDRAM up to 100 MHz with up to two SDRAM or asynchronous memory loads.
Additional loads will limit the SDRAM operation to lower speeds and the maximum speed should be
confirmed by board simulation using IBIS models.
6.11.4 EMIFA Connection Examples
Figure 6-12 illustrates an example of how SDRAM, NOR, and NAND flash devices might be connected to
EMIFA of the device simultaneously. The SDRAM chip select must be EMA_CS[0]. Note that the NOR
flash is connected to EMA_CS[2] and the NAND flash is connected to EMA_CS[3] in this example. Note
that any type of asynchronous memory may be connected to EMA_CS[5:2].
The on-chip bootloader makes some assumptions on which chip select the contains the boot image, and
this depends on the boot mode. For NOR boot mode; the on-chip bootloader requires that the image be
stored in NOR flash on EMA_CS[2]. For NAND boot mode, the bootloader requires that the boot image is
stored in NAND flash on EMA_CS[3]. It is always possible to have the image span multiple chip selects,
but this must be supported by second stage boot code stored in the external flash.
Copyright © 2010, Texas Instruments Incorporated
Peripheral Information and Electrical Specifications
65
Submit Documentation Feedback
Product Folder Link(s): AM1707