MPC8280 datasheet(209/1386 Pages) FREESCALE

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System Interface Unit (SIU)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

4-37

Table 4-13 describes IMMR fields.

4.3.2.8

System Protection Control Register (SYPCR)

The system protection control register, shown in Figure 4-30, controls the system monitors, software

watchdog period, and bus monitor timing. SYPCR can be read at any time but can be written only once

after system reset.

Table 4-13. IMMR Field Descriptions

Bits

Name

Description

0–13

ISB

Internal space base. Defines the base address of the internal memory space. The value of ISB

be configured at reset to one of 8 addresses; it can then be changed to any value by the

software. The default is 0, which maps to address 0x0000_0000.

ISB defines the 14 msbs of the memory map register base address. IMMR itself is mapped in the

internal memory space region. As soon as the ISB is written with a new base address, the IMMR

base address is relocated according to the ISB. ISB can be configured to one of 8 possible

addresses at reset to enable the configuration of multiple-MPC8280 systems.

The number of programmable bits in this field, and hence the resolution of the location of

internal space, depends on the internal memory space of a specific implementation. In the

MPC8280, all 14 bits can be programmed. See Chapter 3, “Memory Map,” for details on the

device’s internal memory map and Chapter 5, “Reset,” for the available default initial values.

14–15

—

Reserved, should be cleared.

16–23

PARTNUM

Part number. This read-only field is mask-programmed with a code corresponding to the part

number of the part on which the SIU is located. It is intended to help factory test and user code

which is sensitive to part changes. This changes when the part number changes. For example,

it would change if any new module is added or if the size of any memory module is changed. It

would not change if the part is changed to fix a bug in an existing module. The part number for

the MPC8280 is 0x0A.

24–31

MASKNUM Mask number. This read-only field is mask-programmed with a code corresponding to the mask

number of the part on which the SIU is located. It is intended to help factory test and user code

which is sensitive to part changes. It is programmed in a commonly changed layer and should

be changed for all mask set changes. The first revision of the MPC8280 has 0x00 in this field.

The value of this field is changed every revision of the device.

Field

SWTC

Reset

1111_1111_1111_1111

R/W

Addr

0x10004

Field

BMT

PBME LBME

—

SWE SWRI SWP

Reset

1111_1111

00_0

R/W

Addr

0x10006

Figure 4-30. System Protection Control Register (SYPCR)

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