MC68EC020FG25 Freescale Semiconductor, MC68EC020FG25 Datasheet - Page 120
MC68EC020FG25
Manufacturer Part Number
MC68EC020FG25
Description
IC MPU 32 BIT 25MHZ 100-QFP
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68EC020AA16.pdf
(306 pages)
Specifications of MC68EC020FG25
Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
100-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Features
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5.7.2.3 BUS ARBITRATION CONTROL (MC68EC020). The bus arbitration control unit in
the MC68EC020 is implemented with a finite state machine. As discussed previously, all
asynchronous inputs to the MC68EC020 are internally synchronized in a maximum of two
cycles of the processor clock.
As shown in Figure 5-48, the input signal labeled R is an internally synchronized version
of the BR signal. The BG output is labeled G, and the internal high-impedance control
signal is labeled T. If T is true, the address, data, and control buses are placed in the high-
impedance state after the next rising edge following the negation of AS and RMC. All
signals are shown in positive logic (active high), regardless of their true active voltage
level.
MOTOROLA
Figure 5-48. MC68EC020 Bus Arbitration State Diagram
R—BUS REQUEST
G—BUS GRANT
T —THREE-STATE CONTROL TO BUS CONTROL LOGIC
X—DON'T CARE
X
STATE1
GT
STATE 2
R
GT
R
M68020 USER’S MANUAL
R
STATE 3
STATE 6
STATE 0
GT
GT
R
GT
R
R
X
R
X
STATE 5
STATE 4
GT
GT
R
5- 73
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