MC68030RC50C Freescale Semiconductor, MC68030RC50C Datasheet - Page 329

• Manufacturer Part Number: MC68030RC50C
• Description: IC MPU 32BIT ENHANCED 128-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68030RC50C

• Processor Type: M680x0 32-Bit
• Speed: 50MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 128-PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

9
I
9.5.2 General Table Search
9-28
9.5.1.12 LONG-FORMAT INDIRECT DESCRIPTOR. The long-format indirect de-
31
When the ATC does not contain a descriptor for the logical address of a
translation tables in memory and obtains the physical address and status
the end of a successful table search, stores the address mapping in the ATC
translated address is transferred to the bus controller (provided no exceptions
were encountered).
The table search begins by selecting the translation tree, using function code
to enable the supervisor root pointer, and FC2 is set for supervisor-level
scriptor has all the attributes of the short-format indirect descriptor described
table that contains long-format descriptors and that it has two unused fields.
The field descriptions in 9.5.1.1 DESCRIPTOR FIELD DEFINITIONS apply to
corresponding fields of this descriptor. Figure 9-18 shows the format of a
information for the page corresponding to the logical address. When a table
search is required, the CPU suspends instruction execution activity and, at
and retries the access. The access then results in a match (it hits) and the
bit FC2 and the SRE bit of the TC register, as shown in Table 9-2. SRE is set
accesses. The translation tree with its root defined by the SRP register is
selected only when SRE and FC2 are both set. Otherwise, the translation table
with its root defined by the CRP register is selected. A simplified flowchart
of the table search procedure is shown in Figure 9-19.
in the preceding section. The only differences are that it is used in a page
long-format indirect descriptor.
processor access and a translation is required, the MC68030 searches the
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Figure 9-18. Long-Format Indirect Descriptor
MC68030 USER'S MANUAL
2 1 O 31
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MOTOROLA
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