MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 1054

• 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

PCI Bus Interface
Figure 17-63
invariance.
Figure 17-64
Note that in all of these examples, the original addresses of the individual bytes within the scalars (as
created by the source) have been preserved.
17.5.2.1
All internal memory-mapped registers in the CCSR space use big endian byte ordering. However, the PCI
specification defines PCI configuration registers as little endian. All accesses to the PCI configuration port,
CFG_DATA, including the those targeting the internal PCI configuration registers, use the address
invariance policy as shown in
little-endian formatted data—either by using the lwbrx/stwbrx instructions or by manipulating the data
before writing to and after reading from CFG_DATA.
17-70
Address lsbs
Significance
Byte lane
Data
Address lsbs
Significance
Byte lane
Data
Byte Order for Configuration Transactions
shows an outbound transfer of an 8-byte scalar, 0x5455_1617_CDCE_2728, using address
shows an inbound transfer of a 2-byte scalar, 0x5837, using address invariance.
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
PCI Configuration Space
MSB
000
54
0
Figure 17-63. Address Invariant Byte Ordering—8 bytes Outbound
Figure 17-64. Address Invariant Byte Ordering—2 bytes Inbound
001
55
1
Big endian source bus
CFG_DATA
010
16
2
011
—
3
011
Figure
17
Little endian
3
source bus
010
—
Figure 17-65. CFG_DATA Byte Ordering
2
CD CE
100
4
MSB LSB
001
58
17-65. Therefore, software must access CFG_DATA with
1
Byte0
Byte3
101
MSB
5
000
37
0
110
27
6
LSB
111
28
7
Byte1
Byte2
MSB
111
28
7
MSB LSB
000
37
0
destination bus
Little endian destination bus
110
27
6
Big endian
001
58
1
101
CE CD
5
Byte2
Byte1
010
—
2
100
4
011
—
3
011
17
3
010
16
2
Freescale Semiconductor
Byte3
Byte0
LSB
001
55
1
LSB
000
54
0