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AFS090 데이터시트(PDF) 168 Page - Microsemi Corporation

부품명 AFS090
상세설명  Fusion Family of Mixed Signal FPGAs
PDF  334 Pages
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제조업체  MICROSEMI [Microsemi Corporation]
홈페이지  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

AFS090 데이터시트(HTML) 168 Page - Microsemi Corporation

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Device Architecture
2- 15 2
R e v isio n 2
At the system level, the skew circuit can be used in applications where transmission activities on
bidirectional data lines need to be coordinated. This circuit, when selected, provides a timing margin that
can prevent bus contention and subsequent data loss or transmitter overstress due to transmitter-to-
transmitter current shorts. Figure 2-108 presents an example of the skew circuit implementation in a
bidirectional communication system. Figure 2-109 shows how bus contention is created, and Figure 2-
110 on page 2-153 shows how it can be avoided with the skew circuit.
Figure 2-108 • Example of Implementation of Skew Circuits in Bidirectional Transmission Systems Using
Fusion Devices
Figure 2-109 • Timing Diagram (bypasses skew circuit)
Transmitter 1: Fusion I/O
Transmitter 2: Generic I/O
ENABLE(t2)
EN(b1)
EN(b2)
EN(r1)
ENABLE(t1)
Bidirectional Data Bus
Transmitter
ENABLE/
DISABLE
Skew or
Bypass
Skew
Routing
Delay (t1)
Routing
Delay (t2)
EN (b1)
EN (b2)
ENABLE (r1)
Transmitter 1: ON
ENABLE (t2)
Transmitter 2: ON
ENABLE (t1)
Bus
Contention
Transmitter 1: OFF
Transmitter 1: OFF
Transmitter 2: OFF



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