MPC8540 datasheet(364/1302 Pages) FREESCALE

364 / 1302 page

MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

9-10

Freescale Semiconductor

DDR Memory Controller

9.4.1.1

Chip Select Memory Bounds (CSn_BNDS)

The chip select bounds registers (CSn_BNDS) shown in Figure 9-2 define the starting and ending

address of the memory space that corresponds to the individual chip selects. Note that the size

specified in CSn_BNDS should equal the size of physical DRAM. Also, note that EAn must be

greater than or equal to SAn. If the high-order 8 bits of an address are greater than or equal to SAn,

and they are less than or equal to EAn, then chip select n will be used.

Table 9-6 describes the CSn_BNDS register fields.

9.4.1.2

Chip Select Configuration (CSn_CONFIG)

The chip select configuration (CSn_CONFIG) registers shown in Figure 9-3 enable the DDR chip

selects and set the number of row and column bits used for each chip select. These registers should

be loaded with the correct number of row and column bits for each SDRAM. Because

CSn_CONFIG[ROW_BITS_CS_n,COL_BITS_CS_n] establish address multiplexing, the user

should take great care to set these values correctly.

15 16

23 24

R 0

0000000

SAn

0000

EAn

Reset

0000_0000_0000_0000_0000_0000_0000_0000

Offset

0x0_2000, 0x0_2008, 0x0_2010, 0x0_2018

Figure 9-2. Chip Select Bounds Registers (CSn_BNDS)

Table 9-6. CSn_BNDS Field Descriptions

Bits

Name

Description

0–7

—

Reserved

8–15

SAn

Starting address for chip select (bank) n. This value is compared against the 8 msbs of the address.

16–23

—

Reserved

24–31

EAn

Ending address for chip select (bank) n. This value is compared against the 8 msbs of the address.

20 21

23 24

28 29

CS_n _EN

00 000 00

AP_n_EN

0 000 000 000 0 0

ROW_BITS_CS_n

00 0 0 0

COL_BITS_CS_n

Reset

0000_0000_0000_0000_0000_0000_0000_0000

Offset

0x0_2080, 0x0_2084, 0x0_2088, 0x0_208C

Figure 9-3. Chip Select Configuration Register (CSn_CONFIG)

MPC8540 Datasheet(PDF) 364 Page - Freescale Semiconductor, Inc

MPC8540 Datasheet(HTML) 364 Page - Freescale Semiconductor, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL