MC68030CRC25C Freescale Semiconductor, MC68030CRC25C Datasheet - Page 328

• Manufacturer Part Number: MC68030CRC25C
• Description: IC MPU 32BIT ENHANCED 128-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68030CRC25C

• Processor Type: M680x0 32-Bit
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 128-PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

L
9.5.1.10 LONG-FORMAT INVALID DESCRIPTOR. The long-format invalid descrip-
31
9.5.1.11 SHORT-FORMAT INDIRECT DESCRIPTOR. The short-format indirect de-
MOTOROLA
tor is used in pointer and page tables that contain long-format descriptors.
ceding section. The first long word contains the DT field in the lowest order
system. Figure 9-16 shows the format of the long-format invalid descriptor.
scriptor does not have a unique descriptor-type code. Rather, it resides in a
short-format descriptors and is neither a page descriptor nor an invalid de-
scriptor. The descriptor-type field contains either the code for a valid 4-byte
descriptor or for a valid 8-byte descriptor, depending upon the size of the
FIELD DEFINITIONS apply to the corresponding fields of this descriptor. Fig-
It is used in the same way as the short-format invalid descriptor in the pre-
bits. The second long word is an unused field, also available to the operating
page table (the bottom level of the address translation tree) that contains
referenced page descriptor. The field descriptions in 9.5.1.1 DESCRIPTOR
ure 9-17 shows the format of a short-format indirect descriptor.
0NusE0
Figure 9-17. Short-Format Indirect Descriptor
I
Figure 9-16. Long-Format Invalid Descriptor
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MC68030 USER'S MANUAL
2 ; 0 3;
DESCRIPTOR ADDRESS
0N0s,0
21 0
9-27
0
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