MPC8280 datasheet(436/1386 Pages) FREESCALE

436 / 1386 page

Memory Controller

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

11-16

Freescale Semiconductor

Table 11-5. OR

x Field Descriptions (SDRAM Mode)

Bits

Name

Description

0–11

SDAM

SDRAM address mask. Provides masking for corresponding BR

x bits. By masking address bits

independently, SDRAM devices of different size address ranges can be used. Clearing bits

masks the corresponding address bit. Setting bits causes the corresponding address bit to be

compared with the address pins. Address mask bits can be set or cleared in any order, allowing

a resource to reside in more than one area of the address map. SDAM can be read or written at

any time.

0000_0000_0000

4Gbytes

1000_0000_0000

2 Gbytes

1100_0000_0000

1 Gbyte

1110_0000_0000

512 Mbytes

1111_0000_0000

256 Mbytes

1111_1000_0000

128 Mbytes

1111_1100_0000

64 Mbytes

1111_1110_0000

32 Mbytes

1111_1111_0000

16 Mbytes

1111_1111_1000

8 Mbytes

1111_1111_1100

4 Mbytes

1111_1111_1110

2 Mbytes

1111_1111_1111

1 Mbyte

Note: If xSDMR[PBI] = 0, the maximum size of the memory bank should not exceed 128 Mbytes.

12–16

LSDAM

Lower SDRAM address mask. Clearing LSDAM implements a minimum size of 1 Mbyte.

SDRAM Page Information

17–18

BPD

Banks per device. Sets the number of internal banks per SDRAM device.

00 2 internal banks per device

01 4 internal banks per device

10 8 internal banks per device (not valid for 128-Mbyte SDRAMs)

11 Reserved

Note: For 128-Mbyte SDRAMs, BPD must be 00 or 01.

19–22

ROWST

Row start address bit. Sets the demultiplexed row start address bit. The value of ROWST

depends on SDMR[PBI].

For xSDMR[PBI] = 0:

0010 A7

0100 A8

0110 A9

1000 A10

1010 A11

1100 A12

1110 A13

Other values are reserved

For xSDMR[PBI] = 1:

0000 A0

0001 A1

...

1100 A12

1101–1111 Reserved

23–25

NUMR

Number of row address lines. Sets the number of row address lines in the SDRAM device.

000 9 row address lines

001 10 row address lines

010 11 row address lines

011 12 row address lines

100 13 row address lines

101 14 row address lines

110 15 row address lines

111 16 row address lines

MPC8280 Datasheet(PDF) 436 Page - Freescale Semiconductor, Inc

MPC8280 Datasheet(HTML) 436 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