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NET AD6
NET AD7
NET A0
NET A1
NET A2
NET A3
NET A4
NET A5
NET A6
NET A7
NET A8
NET A9
NET A10
NET A11
NET A12
NET A13
NET A14
NET A15
NET WR_
NET OE_
NET CE_
NET LCE_
NET RCE_
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:
Jumper
J11
J13, J15
0
0
1
1
LOC=P36;
LOC=P35;
LOC=P1;
# LOWER BYTE OF ADDRESS
LOC=P2;
LOC=P3;
LOC=P75;
LOC=P79;
LOC=P82;
LOC=P83;
LOC=P84;
LOC=P58;
# UPPER BYTE OF ADDRESS
LOC=P56;
LOC=P54;
LOC=P55;
LOC=P53;
LOC=P57;
LOC=P61;
LOC=P34;
LOC=P63;
# ACTIVE-LOW WRITE-ENABLE FOR ALL RAMS
LOC=P62;
# ACTIVE-LOW OUTPUT-ENABLE FOR ALL RAMS
LOC=P65;
# ACTIVE-LOW CHIP-ENABLE FOR XS95 RAM
LOC=P6;
# ACTIVE-LOW CHIP-ENABLE FOR LEFT XSTEND RAM
LOC=P7;
# ACTIVE-LOW CHIP-ENABLE FOR RIGHT XSTEND RAM
Table 3: Jumper settings for XStend codec.
Setting
Placing a shunt on this jumper disables the codec by
holding it in the reset state.
Placing shunts across two of the three pins of these
jumpers selects the digital de-emphasis for different
sampling rates:
0
De-emphasis for 32 KHz
1
De-emphasis for 44.1 KHz
0
De-emphasis for 48 KHz
1
De-emphasis off
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