MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 632

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Local Bus Controller
14.3.1.2
The ORn registers define the sizes of memory banks and access attributes. The ORn attribute bits support
the following three modes of operation as defined by BRn[MSEL].
The ORn registers are interpreted differently depending on which of the three machine types is selected
for that bank.
14.3.1.2.1
The address mask fields of the option registers (ORn[XAM,AM]) mask up to 19 corresponding
BRn[BA,XBA] fields. The 15 lsbs of the 34-bit internal address do not participate in bank address
matching in selecting a bank for access. Masking address bits independently allows external devices of
different size address ranges to be used. Address mask bits can be set or cleared in any order in the field,
allowing a resource to reside in more than one area of the address map.
sizes from 32 Kbytes to 4 Gbytes. Note that the use of the ORn[XAM] fields provides 34-bits of internal
addressing which allows aliasing across 32-bit external banks.
14-12
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•
•
GPCM mode
UPM mode
SDRAM mode
0000_0000_0000_0000_0
1000_0000_0000_0000_0
1100_0000_0000_0000_0
1110_0000_0000_0000_0
1111_0000_0000_0000_0
1111_1000_0000_0000_0
1111_1100_0000_0000_0
1111_1110_0000_0000_0
1111_1111_0000_0000_0
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
Address Mask
Option Registers (OR0–OR7)
Address Mask
Table 14-5. Memory Bank Sizes in Relation to Address Mask
Memory Bank Size
512 Mbytes
256 Mbytes
128 Mbytes
64 Mbytes
32 Mbytes
16 Mbytes
4 Gbytes
2 Gbytes
1 Gbyte
1111_1111_1000_0000_0
1111_1111_1100_0000_0
1111_1111_1110_0000_0
1111_1111_1111_0000_0
1111_1111_1111_1000_0
1111_1111_1111_1100_0
1111_1111_1111_1110_0
1111_1111_1111_1111_0
1111_1111_1111_1111_1
Address Mask
Table 14-5
Memory Bank Size
shows memory bank
512 Kbytes
256 Kbytes
128 Kbytes
Freescale Semiconductor
64 Kbytes
32 Kbytes
8 Mbytes
4 Mbytes
2 Mbytes
1 Mbyte