MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
10-1
Chapter 10
Memory Controller
The memory controller generates interface signals to support a glueless interface to external memory and
peripheral devices. It supports four regions, each with its own programmed attributes. The four regions are
controlled by four chip-select signals. Read and write strobes are also provided.
The memory controller operates in parallel with the external bus interface to support external cycles. When
an access to one of the memory regions is initiated, the memory controller takes ownership of the external
signals and controls the access until its termination. Refer to
Figure 10-1. Memory Controller Function within the USIU
10.1
Overview
The memory controller provides a glueless interface to external EPROM, static RAM (SRAM), Flash
(EEPROM), and other peripherals. The general-purpose chip-selects are available on lines CS0 through
CS3. CS0 also functions as the global (boot) chip-select for accessing the boot Flash EEPROM. The chip
select allows zero to 30 wait states.
is a block diagram of the MPC561/MPC563 memory controller.
Internal Bus
EBI Bus
Memory Controller
U-bus
Interface
External
Bus
Interface
Memory
Controller
ADDR[0:31]
DATA[0:31]
Control Bus
WE
[0:3]/
BE
[0:3]
OE
CS
[0:3]
Bus
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...