L-Bus to U-Bus Interface (L2U)
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
11-3
Figure 11-1. L2U Bus Interface Block Diagram
11.4
Modes Of Operation
The L2U module can operate in the following modes:
•
Normal mode
•
Reset operation
•
Peripheral mode
•
Factory test mode
11.4.1
Normal Mode
In normal mode (master or slave) the L2U module acts as a bidirectional protocol translator.
•
In master mode the RCPU is fully operational, and there is no external master access to the U-bus.
•
Slave mode enables an external master to access any internal bus slave while the RCPU is fully
operational. The L2U transfers load/store accesses from the RCPU to the U-bus and the read/write
accesses by the U-bus master to the L-bus.
In addition to the bus protocol translation, the L2U supports other functions such as show cycles, data
memory protection, and MPC500 reservation protocol.
E-Bus
MPC500
Core
L-Bus
U-Bus
+
FP
USIU
Burst Buffer
Controller
DMPU
Reservation
Control
Address
Decode
U-Bus
Interface
L-Bus
Interface
UIMB
Interface
L-Bus to U-Bus Interface
IMB3
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...