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about.book Page 18 Monday, June 7, 1999 10:17 AM
PLD (U24) Equations (continued)
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Equations
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dtmf2oe = pcs5;
“Inverted pcs5# to create active high output enable for
“the DTMF on POTS channel 2
dtmf1oe = pcs4;
“Inverted pcs4# to create active high output enable for
“the DTMF on POTS channel 1
txda
= cctxda;
“Equals the Am186CC TXDA output when the DSLAC
“is NOT transmitting on the PCM bus. This is needed
“in case the HDLC TSA’s are configured in muxed mode
“and a POTS line is needed. The Am186CC TXDA
“output will be three-stated when the POTS interface is
“transmitting
rxda
= txdd;
“Equals the Am186CC TXDD output when PCM
“channel D is transmitting. This is used if the Am186CC
“is required to transmit data directly to the DSLAC.
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