Sdram Layout Notes; Sdram Memory Types Supported By Pxa27X Processor - Intel PXA27 Series Design Manual

System Memory Interface
6.5.1.3

SDRAM Layout Notes

For recommendations on trace lengths, size, and routing guidelines, refer to:
•
Part II: Section 6.4, "Memory Controller Layout Notes"
For AC timing information, refer to Intel
Thermal Specification and Intel
Specification
6.5.1.3.1 SDRAM Memory Types Support
See Table 6-6
PXA27x processor.
Table 6-6. SDRAM Memory Types Supported by PXA27x Processor
SDRAM
Bank Bits x
Configu-
Chip Row bits x
ration
Size Column
(Words x
Bits)
16 Mbit 1 M x 16 1 x 11 x 8
16 Mbit 2 M x 8 1 x 11 x 9
16 Mbit 4 M x 4 1 x 11 x 10
64 Mbit 2 M x 32 2 x 11 x 8
1 x 13 x 8
64 Mbit 4 M x 16
2 x 12 x 8
1 x 13 x 9
64 Mbit 8 M x 8
2 x 12 x 9
1 x 13 x 10
64 Mbit 16 M x 4
2 x 12 x 10
128 Mbit 8 M x 16 2 x 12 x 9
128 Mbit 16 M x 8 2 x 12 x 10
128 Mbit 32 M x 4 2 x 12 x 11
16 M x
256 Mbit 2 x 13 x 9
16
256 Mbit 32 M x 8 2 x 13 x 10
32 M x
512 Mbit 2 x 13 x 10
16
II:6-12
®
PXA27x Processor Family Electrical, Mechanical, and Thermal
for the list of SDRAM memory types and densities that are supported by the
Partition Size
(Mbyte/Partition)
Bits
16-bit 32-bit
Bus Bus
2 Mbyte 4 Mbyte
4 Mbyte 8 Mbyte
8 Mbyte 16 Mbyte
N/A 8 Mbyte
8 Mbyte 16 Mbyte
16 Mbyte 32 Mbyte
32 Mbyte 64 Mbyte
16 Mbyte 32 Mbyte
32 Mbyte 64 Mbyte
64 Mbyte N/A
32 Mbyte 64 Mbyte
64 Mbyte N/A
64 Mbyte N/A
®
PXA270 Processor Electrical, Mechanical, and
Number Chips/ Total Number
Partition of Chips
16-bit 32-bit 16-bit
Bus bus Bus
1 2 4
2 4 8
4 8 16
N/A 1 N/A
1 2 4
2 4 8
4 8 16
1 2 4
2 4 8
4 8 16
1 2 4
2 4 8
1 2 4
®
Intel PXA27x Processor Design Guide
Maximum
Memory
(4 Partitions)
32-bit 16-bit 32-bit
Bus Bus Bus
8 8 Mbyte 16 Mbyte
16 16 Mbyte 32 Mbyte
32 32 Mbyte 64 Mbyte
4 N/A 32 Mbyte
8 32 Mbyte 64 Mbyte
128
16 64 Mbyte
Mbyte
128 256
32
Mbyte Mbyte
128
8 64 Mbyte
Mbyte
128 256
16
Mbyte Mbyte
256
32 N/A
Mbyte
128 256
8
Mbyte Mbyte
256
16 N/A
Mbyte
256
8 N/A
Mbyte