AFS090 datasheet(168/334 Pages) MICROSEMI

168 / 334 page

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 2: OFF

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