AM8530H AMD [Advanced Micro Devices], AM8530H Datasheet - Page 175

• Manufacturer Part Number: AM8530H
• Description: Serial Communications Controller
• Manufacturer: AMD [Advanced Micro Devices]

AMD
7.6
7.6.1
The changing data-processing environment has created attractive opportunities for dis-
tributed processing, encouraging both users and vendors to support the concept. Distrib-
uted processing provides either functional or geographical dispersion while integrating the
dispersed parts into a coherent system.
The main advantages of distributed processing power are:
a. Efficiency—
functions with equal efficiency.
b. Low Cost—
c. Control—
d. Unlimited Access—
e. Response Time—
7–26
PA16R4
PAT 002
68000 TO 8500 OR 9500 PERIPHERALS
ADVANCED MICRO DEVICES
CLOCK
/OE
A := A*/B + B *C + /AS
B := A*/C + /A*C + /AS
C := /A*/B*AS + B*C*AS
DLDS := LDS
RD = LDS*DLDS*RW*/INTA + /INTA*/A*/B*C*WO + INTA*/B*A + ACK * LDS
DESCRIPTION
THIS PAL DEVICE INTERFACESN 85XX TYPE PERIPHERALS TO THE 68000
MICRO PROCESSOR.
/WO = 0 IS ONE AND /WO = 1 IS TWO WAIT STATES.
ARE INSERTED DURING THE INTERRUPT ACKNOWLEDGE CYCLES.
RD OUTPUT GENERATED DURING INTA IS A FUNCTION OF THE INTERNAL
STATE MACHINE AND NOT A FUNCTION OF LDS.
SINCE THE FLIP–FLOP OUTPUTS ARE NOT USED DIRECTLY.
EDGE OF RD IS DELAYED IN ORDER TO GUARANTEE THE CS TO RD SETUP
TIME REQUIREMENTS.
Specialized machines perform their functions in an efficient manner. Large,
centralized systems are often multi-tasked and they do not necessarily perform all the
i. A less complex computer, or other forms of distributed intelligence, is required.
ii. It simplifies certain applications where only data accessing is required.
Users have control of most of the computing power in the system organization.
Distributed processing power allows the user greater access to the machine operating
system and hardware. In large, centralized systems, very few users are allowed to
access the mainframe’s operating system and hence cannot take full advantage of all
the computer’s power.
Local processing eliminates the relatively slow common-carrier lines in favor of high-
speed channels. Distributed processing can improve response time for certain
applications that can be partitioned for simultaneous execution in parallel on multiple,
/INTA
/CS
Am7960 AND Am8530H APPLICATION
Distributed Data Processing Overview
PAL DESIGN SPEC
JOE BRICH 9 SEPT 83
RW
/ACK
/LDS
/C
IT INSERTS 1 OR 2
Figure 7–16. PAL Equations
/WO
/B
/A
/AS
/DLDS
FCO FC1
/RD
WAIT STATES AS SELECTED BY
FC2 GND
/WR
OE CAN BE LEFT OPEN
VCC
SCC Application Notes
FOUR WAIT STATES
THE FALLING
ALSO THE