MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
9-1
Chapter 9
External Bus Interface
The MPC561/MPC563 external bus is a synchronous, burstable bus. Signals driven on this bus must
adhere to the setup and hold time relative to the bus clock’s rising edge. The bus has the ability to support
multiple masters. The MPC561/MPC563 external bus interface architecture supports byte, half-word, and
word operands allowing access to 8-, 16-, and 32-bit data ports through the use of synchronous cycles
controlled by the size outputs (TSIZ0, TSIZ1). For accesses to 16- and 8-bit ports, the slave must be
controlled by the memory controller. For more information, refer to
9.1
Features
The external bus interface features are listed below:
•
32-bit address bus with transfer size indication (only 24 available on pins)
•
32-bit data bus
•
Bus arbitration logic on-chip with external master support
•
Chip-select and wait state generation to support peripheral or static memory devices through the
memory controller
•
Supports various memory (SRAM, EEPROM) types: synchronous and asynchronous, burstable
and non-burstable
•
Supports non-wrap bursts with up to four data beats
•
Flash ROM programming support
•
Implements the PowerPC ISAarchitecture
•
Easy to interface to slave devices
•
Bus is synchronous (all signals are referenced to rising edge of bus clock)
•
Bus can operate at the same frequency as the internal RCPU core of MPC561/MPC563 or half the
frequency.
9.2
Bus Transfer Signals
The bus transfers information between the MPC561/MPC563 and external memory of a peripheral device.
External devices can accept or provide 8, 16, and 32 data bits in parallel and must follow the handshake
protocol described in this section. The maximum number of bits accepted or provided during a bus transfer
is defined as the port width.
The MPC561/MPC563 has non-multiplexed address and data buses. Control signals indicate the
beginning and type of the cycle, as well as the address space and size of the transfer. The selected device
Summary of Contents for MPC561
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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...