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8x300 design guide - Al Kossow's Bitsavers - Trailing-Edge

8x300 design guide - Al Kossow's Bitsavers - Trailing-Edge

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PRELIMINARY<br />

BIPOLAR LSI DIVISION<br />

CHANNEl 0<br />

DBA<br />

DAB<br />

0 0<br />

FUNCTION<br />

Data transmission<br />

inhibited<br />

CHANEL1<br />

0 1<br />

Ai-Bi<br />

CHANNEL 2<br />

1 0<br />

Ai-Bi<br />

i Aj Bi<br />

Ai-Bi -<br />

CHANEL3<br />

CHANNEl 4<br />

i = Channel 0, 1,2,3,4,5,6, or 7<br />

Aj - Bi = Data transmission from Ai to Bi<br />

Aj - Bj = Data transmission from Bi to Ai<br />

AS<br />

CHANNElS<br />

BS<br />

TRUTH TABLE FOR INTERNAL<br />

LATCHES<br />

CHANNELS<br />

LATCHES<br />

L1 L2<br />

DIRECTION OF DATA<br />

CHANNEl 7<br />

1 1 Monitoring state<br />

1 0 Ai to Bi<br />

0 1 Bj to Ai<br />

0 0 No transmissjon<br />

Figure 1. Logic Diagram of 8X41 Asynchronous Bidirectional Bus Extender<br />

and Repeater<br />

INPUT /OUTPUT TRUTH TABLE<br />

EXTERNAL CONTROLS INPUT SIGNALS OUTPUT DRIVER SIGNALS<br />

DAB DBA AI BI ADI BDI<br />

H H L L H H<br />

H H L H H L<br />

H H H L L H<br />

H H H H H H<br />

H L L L H L<br />

H L L H H L<br />

H L H L H H<br />

H L H H H H<br />

L H L L L H<br />

L H L H H H<br />

L H H L L H NOTES<br />

L H H H H H Ai = External signal BDi = Output B driver<br />

L L X X H H ADi = Output A driver X = Don't care<br />

Bi = External signal<br />

4 9!!110liC9

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