MC68030RC50C Freescale Semiconductor, MC68030RC50C Datasheet - Page 376

• 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: -

M O T O R O L A
tine. They use physical addresses.
With physical m e m o r y allocation provided for, the operating system must
address translation tables. Typically, this type of routine allocates pieces of
certain sizes. GetReal is the allocation routine; ReturnReal is the return rou-
be able to manage virtual m e m o r y for all tasks. To do this, the system must
be aware of the virtual m e m o r y map. It must k n o w the total a m o u n t of virtual
m e m o r y space, h o w much is allocated, and which areas are available to be
assigned to tasks. The virtual m e m o r y map looks like this:
Virtual addresses for this virtual m e m o r y are subdivided:
I
x -- Ignored (3 bits)
u -- Upper level index (5 bits), maps 32 long-table entries
31
(-- Lower level index (11 bitsJ, maps 2048 short-page entries
x x x u
LOW MEMORY
uuuu
528M
16M
2M
3M
1M
M C 6 8 0 3 0 USER'S M A N U A L
0
IIII
IIII
USER PROGRAM/DATA/STACK
(LOGICAL = PHYSICAL)
DIRECT MAPPED
HARDWARE I/0
OS KERNEL
UNUSED
(496M)
IIio
oooo
oooo
0 0 0 0
9-75
0
I
9