Information
System Configuration
MPC8308 PowerQUICC II Pro Processor Reference Manual, Rev. 1
Freescale Semiconductor 5-15
5.1.11 Accessing Internal Memory from External Masters
In addition to being accessible by the e300 processor, the IMMR memory window is accessible from
external interfaces. This allows external masters on the I/O ports to configure the device.
External masters do not need to know the location of the IMMR memory in the local address map. Rather,
they access this region of the local memory map through a window defined by a register in the interface’s
programming model that is accessible to the external master from its external memory map.
5.2 System Configuration
The following sections describe some general information and configuration options that affect system
behavior and performance.
5.2.1 System Configuration Register Memory Map
Table 5-18 shows the memory map for the system configuration registers.
Table 5-18. System Configuration Register Memory Map
Local Memory
Offset (Hex)
Register Access Reset Section/Page
System Configuration—Block Base Address 0x0_0000
0x00100 System general purpose register low (SGPRL) R/W 0x0000_0000 5.2.2.1/5-16
0x00104 System general purpose register high (SGPRH) R/W 0x0000_0000 5.2.2.2/5-16
0x00108 System part and revision ID register (SPRIDR) R 8101_01nn 5.2.2.3/5-17
0x0010C Reserved — — —
0x00110 System priority configuration register (SPCR) R/W 0x0000_0000 5.2.2.4/5-17
0x00114 System I/O configuration register low (SICRL) R/W 0x0000_0000
1
1
Bit #25 depends on the RCW.
5.2.2.5/5-19
0x00118 System I/O configuration register high (SICRH) R/W
0x0014_5000
2
2
Bit #30 depend on RCW.
5.2.2.6/5-22
0x0011C–0x00124 Reserved — — —
0x00128 DDR control driver register (DDRCDR) R/W 0x0000_0000 5.2.2.9/5-26
0x0012C DDR debug status register (DDRDSR) R 0x3300_0000 5.2.2.10/5-28
0x00140 PCI Express control register 1 (PECR1) R/W 0x0000_0000 5.2.2.11/55-28
0x00144 eSDHC control regiser (SDHCCR) R/W 0x0000_0000 5.2.2.12/55-30
0x00148 RTC control register (RTCCR) R/W 0x0000_0000 5.2.2.13/55-32
0x00160–0x001FC Reserved — — —