XESS XStend, Руководство пользователя

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NET AD6 LOC=P36;
NET AD7 LOC=P35;
NET A0 LOC=P1; # LOWER BYTE OF ADDRESS
NET A1 LOC=P2;
NET A2 LOC=P3;
NET A3 LOC=P75;
NET A4 LOC=P79;
NET A5 LOC=P82;
NET A6 LOC=P83;
NET A7 LOC=P84;
NET A8 LOC=P58; # UPPER BYTE OF ADDRESS
NET A9 LOC=P56;
NET A10 LOC=P54;
NET A11 LOC=P55;
NET A12 LOC=P53;
NET A13 LOC=P57;
NET A14 LOC=P61;
NET A15 LOC=P34;
NET WR_ LOC=P63; # ACTIVE-LOW WRITE-ENABLE FOR ALL RAMS
NET OE_ LOC=P62; # ACTIVE-LOW OUTPUT-ENABLE FOR ALL RAMS
NET CE_ LOC=P65; # ACTIVE-LOW CHIP-ENABLE FOR XS95 RAM
NET LCE_ LOC=P6; # ACTIVE-LOW CHIP-ENABLE FOR LEFT XSTEND RAM
NET RCE_ LOC=P7; # ACTIVE-LOW CHIP-ENABLE FOR RIGHT XSTEND RAM
2.7 Stereo Codec
The XStend Board has a stereo codec that accepts two analog input channels from jack J9,
digitizes the analog values, and sends the digital values to the XS Board as a serial bit stream.
The codec also accepts a serial bit stream from the XS Board and converts it into two analog
output signals which exit the XStend Board through jack J10.
The codec is configured by placing shunts on the following jumpers:
Table 3: Jumper settings for XStend codec.
Jumper Setting
J11 Placing a shunt on this jumper disables the codec by
holding it in the reset state.
J13, J15 Placing shunts across two of the three pins of these
jumpers selects the digital de-emphasis for different
sampling rates:
0 0 De-emphasis for 32 KHz
0 1 De-emphasis for 44.1 KHz
1 0 De-emphasis for 48 KHz
1 1 De-emphasis off