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MC6829 Datasheet

MEMORY MANAGEMENT UNIT

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@ MOTOROLA
MC6829
Advance Infor:rnation
MEMORY MANAGEMENT UNIT
The principle function of the MC6829 Memory Management Unit
(MMUI is to expand the address space of the MC6809 from 64K bytes to
a maximum of 2 Megabytes. Each MMU is capable of handling four dif-
ferent concurrent tasks including DMA. The MMU can also protect the
address space of one task from modification by another task. Memory
address space expansion is accomplished by applying the upper five ad-
dress lines of the processor (A 11-A151 along with the contents of a 5-bit
task register to an internal high-speed mapping RAM. The MMU output
consists of ten physical address lines (PA 11-PA201 which, when com-
bined with the eleven lower address lines of the processor (AO-A101,
forms a physical address space of 2 Megabytes. Each task is assigned
memory in increments of 2K bytes up to a total of 64K bytes. In this
manner, the address spaces of different tasks can be kept separate from
one another. The resulting simplification of the address space program-
ming model will increase the software reliability of a complex multi-
process system.
• Expands Memory Address Space from 64K to 2 Megabytes
• Each MMU is Capable of Handling Four Separate Tasks
• Up to Eight M MUs can be Used in a System
• Provides Task Isolation and Write Protection
• Provides Efficient Memory Allocation; 1024 Pages of 2K Bytes Each
• Designed for Efficient Use with DMA
• Fast, Automatic On-Chip Task Switching
• Allows Inter-Process Communication Through Shared Resources
• Simplifies Programming Model of Address Space
• Increases System Software Reliability
• MC6809/MC6800 Bus Compatible
• Single 5-Volt Power Supply
All-A15
BLOCK DIAGRAM
Mapping RAM
Task 0 Registers
Task 1 Registers
Task 2 Registers
Task 3 Registers
PAll-PAlO
BA
BS
m
~ RESET
This document contains information on a new product. Specifications and information herein
are subject to change without notice.
HMOS
(HIGH DENSITY N-CHANNEL, SILICON-GATEI
MEMORY MANAGEMENT UNIT
(MMU)
CASE 71'
PIN ASSIGNMENT
VSS
A15
A14
A13
A12
All
Ai'.
RS6
RS5
RS4
RS3
RS2
RSl
RSO
KVA
0
E
BA
BS 19
RESET 20
PAll
PA12
PA13
PA14
PA15
PA16
PA17
PAlS
PA19
PA20
07
06
05
04
03
02
01
00
VCC
R/W


Motorola Electronic Components Datasheet

MC6829 Datasheet

MEMORY MANAGEMENT UNIT

No Preview Available !

MC6829
MAXIMUM RATINGS
Characteristics
Supply Voltage
Input Voltage
Operating Temperature Range
MC6829, MC68A29, MC68B29
MC6829C, MC68A29C, MC68B29C
Storage Temperature Range
THERMAL CHARACTERISTICS
Thermal Resistance
Plastic
Cerdip
Ceramic
Symbol
Vcc
Yin
TA
Tsta
Value
-0.3to+7.0
-0.3 to + 7.0
TL to TH
o to 70
-40 to +85
-55to+150
Unit
V
V
'c
'c
This device contains circuitry to protect the in-
puts against damage due to high static voltages
or electric fields; however, it is advised that nor-
mal precautions be taken to avoid application of
any voltage higher than maximum rated voltages
to this high-impedance circuit. Reliability of
operation'is enhanced if unused inputs are tied to
an appropriate logic voltage level (e.g., either
VSS or VCCI.
Symbol
8JA
Value
100
60
50
Rating
'C/W
POWER CONSIDERATIONS
The average chip-junction temperature, TJ, in °c can be obtained from:
TJ = TA + IPD-8JAI
Where:
(1)
TA '" Ambient Temperature, °c
8JA=Package Th"ermal Resistance, Junction-to-Ambient, °C/W
PD'" PINT+ PPORT
PINT=lccxVCC, Watts - Chip Internal Power
PPORT- Port Power Dissipation, Watts - User Determined
For most applications PPORT<C PINT and can be neglected. PPORT may become significant if the device is configured to
drive Darlington bases or sink LED loads.
An approximate relationship betwElen PD and TJ lif PPORT is neglected) is:
PD=K+ITJ+273°C)
(2)
Solving equations 1 and 2 for K gives:
K = PD-ITA + 273°C) + 8JA-PD2
(3)
Where K is a constant pertaining to the particular part. K can be determined from equation 3 by measuring PD lat equilibrium)
for a known TA. Using this value of K the values of PD and TJ can be obtained by solving equations (1) and (2) iteratively for any
value of TA.
DC ELECTRICAL CHARACTERISTICS IVcC=5.0 Vdc ±5%, VSS=O,'TA=TL to TH unless otherwise noted I
Characteristic
Symbol
Min
Typ
Max
Input High Voltage
Input Low Voltage
Input Leakage Current IVin = 0 to 5.25 VI
All Inputs VIH VSS+2.0
-
VCC
All Inputs VIL VSS-0.3
-
VSS+0.8
VCC= Max
lin
-
1.0 2.5
Hi-Z IOff Statellnput Current IVin - 0.4 to 2.4 VI
00-07 liZ
2.0 10
Output High Voltage
IILoad= -205 /tA, VCC= Mini
IILoad= -145 /tA, VCC= Mini
00-07
PAll-PA20
VOH
VSS + 2.4
VSS + 2.4
-
-
-
-
Output Low Voltage
IILoad=2.0 mA, VCC= Mini
Internal Power Dissipation (Measured at TA - QOC)
Input Capacitance IVin-O, TA-25'C, f-l.5 MHzl
All Outputs
All Inputs
VOL
PINT
Cin
-
-
- VSS+0.5
- 800
lU.U 12.U
Output Capacitance IVin-O, TA -25'C, 1-1.5 MHzl
All Outputs Cout
12.0
Unit
V
V
/tA
/t A
V
V
mW
p~
pF


Part Number MC6829
Description MEMORY MANAGEMENT UNIT
Maker Motorola
Total Page 16 Pages
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