Datasheet

Table 1: Control Switch Functions (applies to both U1 and U2)
Silkscreen Connections Notes
S11 DISABLE 0 U1, U2 EN0* Up position disables channel 0 on both devices.
S8 DISABLE 1 U1 EN1* Up position disables channel 1 on U1.
J7 U2 EN1* Open position disables channel 1 on U2.
S10 Sel0
S9 Sel1
U1, U2 Sel0
U1, U2 Sel1
Configures both U1 and U2 functionality.
Up = 1 down = 0
See datasheet for function table.
S7 PEMX0
S6 PEMX1
U1, U2 PEM00-PEM10
U1, U2 PEM01-PEM11
Configures pre-emphasis feature on both devices and both
channels.
Up =1 Down = 0
See datasheet for function table.
Figure 1: U1 Block Diagram
Figure 2: U2 Block Diagram
Table 2: IEEE-1149.1 and IEEE-1149.6 (applies only to U2)
Silkscreen Function Notes
J1 1149.6 IEEE 1149.1 test bus
access to 1149.6 features
U1 is the first device in the scan chain; U2 is the last device in
the scan chain. TDO, TMS, TCK, /TRST (out) are from the test
system to the device/chain under test. TDI (in) is from the
device/chain under test to the test system.
S1 Short C1 Up position to short coupling capacitor.
S2 Short C2 Up position to short coupling capacitor.
S3 Open Down position to create open circuit.
S4 Open Down position to create open circuit at termination resistor.
S5 Open Termination Resistor Down position to create open circuit.