2 memory base address register (rambar), 2 memory base address register (rambar) -4 – Freescale Semiconductor ColdFire MCF52210 User Manual
Page 180
System Control Module (SCM)
MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
12-4
Freescale Semiconductor
NOTE
Accessing reserved IPSBAR memory space could result in an unterminated
bus cycle that causes the core to hang. Only a hard reset allows the core to
recover from this state. Therefore, all bus accesses to IPSBAR space should
fall within a module’s memory map space.
If an address hits in overlapping memory regions, the following priority is used to determine what memory
is accessed:
1. IPSBAR
2. RAMBAR
NOTE
This is the list of memory access priorities when viewed from the processor
core.
See
for descriptions of the bits in IPSBAR.
12.5.2
Memory Base Address Register (RAMBAR)
The device supports dual-ported local SRAM memory. This processor-local memory can be accessed
directly by the core and/or other system bus masters. Because this memory provides single-cycle accesses
at processor speed, it is ideal for applications where double-buffer schemes can be used to maximize
system-level performance. For example, a DMA channel in a typical double-buffer application (also
IPSBAR
Offset: 0x0000 (IPSBAR)
Access: read/write
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
BA31 BA30
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
V
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Figure 12-1. IPS Base Address Register (IPSBAR)
Table 12-3. IPSBAR Field Description
Field
Description
31–30
BA
Base address. Defines the base address of the 1-Gbyte internal peripheral space. This is the starting address for the
IPS registers when the valid bit is set.
29–1
Reserved, should be cleared.
0
V
Valid. Enables/disables the IPS Base address region. V is set at reset.
0 IPS Base address is not valid.
1 IPS Base address is valid.