MC68EN360AI25VL Freescale, MC68EN360AI25VL Datasheet - Page 517

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MC68EN360AI25VL

Manufacturer Part Number
MC68EN360AI25VL
Description
Manufacturer
Freescale
Datasheet

Specifications of MC68EN360AI25VL

Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
25MHz
Instruction Set Architecture
RISC
Operating Supply Voltage (max)
3.3V
Operating Supply Voltage (min)
2.7V
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
240
Package Type
FQFP
Lead Free Status / RoHS Status
Compliant

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To ensure that all stations gain an equal share of the bus, a priority mechanism is also imple-
mented in HDLC bus. Once an HDLC bus node has completed the transmission of a frame,
it waits for 10 consecutive one bits, rather than just 8, before beginning the next transmis-
sion. In this way, all nodes desiring to transmit will obtain the bus, before a node transmits
twice. Once a node detects that 10 consecutive ones have occurred on the bus, it may
attempt transmission and can reinstate its original priority of waiting for 8 ones.
7.10.18.2.2 More Performance. Since HDLC bus is used in a wired-OR configuration, the
limit of HDLC bus operation is determined by the rise time of the one bit.
Figure 7-57 shows a method to increase performance. The user supplies a clock that is high
for a shorter duration than it is low, which allows more rise time in the case of a one bit.
(OUTPUT)
(INPUT)
TCLK
TXD
CTS
(OUTPUT)
(INPUT)
TCLK
TXD
CTS
Figure 7-56. HDLC Bus Collision Detection
Figure 7-57. Non-Symmetrical Duty Cycle
Freescale Semiconductor, Inc.
For More Information On This Product,
MC68360 USER’S MANUAL
Go to: www.freescale.com
Serial Communication Controllers (SCCs)
CTS SAMPLED AT HALFWAY POINT.
COLLISION DETECTED WHEN
TXD = 1, BUT CTS = 0.
CTS sampled at three quarter point.
Collision detected when
TXD = 1, but CTS = 0.

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