Peripheral Bridge (PBRIDGE_A, PBRIDGE_B)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
5-11
5.4
Functional Description
The PBRIDGE serves as an interface between a system bus and the peripheral (slave) bus. It functions as
a protocol translator. Support is provided for generating a pair of 32-bit peripheral accesses when targeted
by a 64-bit system bus access. No other bus-sizing access support is provided.
Accesses that fall within the address space of the PBRIDGE are decoded to provide individual module
selects for peripheral devices on the slave bus interface.
5.4.1
Access Support
Aligned 64-bit accesses, aligned word and halfword accesses, as well as byte accesses are supported for
32-bit peripherals. Peripheral registers must not be misaligned, although no explicit checking is performed
by the PBRIDGE.
NOTE
Data accesses that cross a 32-bit boundary are not supported.
5.4.2
Peripheral Write Buffering
The PBRIDGE provides programmable write buffering capability to buffer write accesses in the
PBRIDGE for later completion, while terminating the system bus access early. This provides improved
performance in systems where frequent writes to a slow peripheral occur.
PBRIDGE_B_OPACR0
PBRIDGE_ 0x0040
0
eQADC
0b0100
1-4
—
0b0100
5
DSPI B
0b0100
6
DSPI C
0b0100
7
DSPI D
0b0100
PBRIDGE_B_OPACR1
PBRIDGE_ 0x0044
0-3
—
0b0100
4
eSCI A
0b0100
5
eSCI B
0b0100
6-7
—
0b0100
PBRIDGE_B_OPACR2
PBRIDGE_ 0x0048
0
FlexCAN A
0b0100
1
FlexCAN B
0b0100
2
FlexCAN C
0b0100
3-7
—
0b0100
PBRIDGE_B_OPACR3
PBRIDGE_ 0x004C
0
—
0b0100
1-6
—
0b0100
7
BAM
0b0100
Table 5-6. PACR and OPACR Access Control Registers and Peripheral Mapping (continued)
Register
Register Address
Peripheral
Access Field #
Peripheral Type
Access Field
Default Value
Содержание MPC5565
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