MC68020RC25E Freescale Semiconductor, MC68020RC25E Datasheet - Page 120

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MC68020RC25E

Manufacturer Part Number
MC68020RC25E
Description
IC MICROPROC 32-BIT 25MHZ 114PGA
Manufacturer
Freescale Semiconductor
Datasheet

Specifications of MC68020RC25E

Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
114-PGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Other names
Q1165253

Available stocks

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Part Number:
MC68020RC25E
Manufacturer:
MOT
Quantity:
28
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
Freescale Semiconductor, Inc.
STATE1
GT
STATE 2
R
For More Information On This Product,
GT
Go to: www.freescale.com
R
M68020 USER’S MANUAL
R
STATE 3
STATE 6
STATE 0
GT
GT
GT
R
R
R
X
R
X
STATE 4
STATE 5
GT
GT
R
5- 73

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