mcf5272 Freescale Semiconductor, Inc, mcf5272 Datasheet - Page 108

• Manufacturer Part Number: mcf5272
• Description: Mcf5272 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

Local Memory Registers
4.2 Local Memory Registers
Table 4-1 lists the local memory registers. Note the following:
4.3 SRAM Overview
The SRAM module has the following features:
4.3.1 SRAM Operation
The SRAM module provides a general-purpose memory block the ColdFire core can access
in a single cycle. The location of the memory block can be set to any 4-Kbyte address
boundary within the 4-Gbyte address space. The memory is ideal for storing critical code
or data structures or for use as the system stack. Because the SRAM module is physically
connected to the processor's high-speed local bus, it can quickly service core-initiated
accesses or memory-referencing commands from the debug module.
Section 4.1, “Interactions between Local Memory Modules,” describes priorities when an
access address hits multiple local memory resources.
4.3.2 SRAM Programming Model
The MCF5272 implements the SRAM base address register (RAMBAR), shown in
Figure 4-1 and described in the following section.
4-2
• Addresses not assigned to the register and undefined register bits are reserved. Write
• The reset value column indicates the register initial value at reset. Uninitialized
• 4-Kbyte SRAM, organized as 1K x 32 bits
• Single-cycle access
• Physically located on the ColdFire core's high-speed local bus
• Byte, word, longword address capabilities
• Programmable memory mapping
Address (using MOVEC)
accesses to these bits have no effect; read accesses return zeros.
fields may contain random values after reset.
0xC04
0x002
0x004
0x005
0xC00
Table 4-1. Memory Map of Instruction Cache Registers
ROMBAR
RAMBAR
Name
CACR
ACR0
ACR1
MCF5272 User’s Manual
Width
32
32
32
32
32
Cache control register
Access control register 0
Access control register 1
ROM base address register
SRAM base address register Uninitialized (except V = 0)
Description
Uninitialized (except V = 0)
Reset Value
0x0000
0x0000
0x0000
MOTOROLA