Datasheet

DS3112
30 of 133
Signal Name: T3E3MS
Signal Description: T3/E3 Mode Select Input
Signal Type: Input
This signal determines whether the DS3112 will operate in either the T3 mode or the E3 mode. It acts as a
global control bit for the entire DS3112. This signal should be set into the proper state before a hardware
reset is issued via the RST signal. This input is coupled with the G.747E input to create a special test
mode whereby all the outputs are tri-stated (
Table 2-3).
0 = T3 Mode
1 = E3 Mode
Signal Name: G.747E
Signal Description: G.747 Mode Enable Input
Signal Type: Input
This signal determines whether the DS3112 will operate in either the T3 mode or the G.747 mode. It acts
as a global control bit for the entire DS3112. This signal should be set into the proper state before a
hardware reset is issued via the RST signal. This input is coupled with the T3E3MS input to create a
special test mode whereby all the outputs are tri-stated (
Table 2-3).
0 = T3 Mode
1 = G.747 Mode
Table 2-3. Mode Select Decode
T3E3MS G.747E MODE SELECTED
0 0 T3 or M13 Operation
0 1 G.747 Operation
1 0 E3 or E13 Operation
1 1
Special Test Mode that tri-states all outputs. JTRST must be driven
low for tri-state operation without power-up. Refer to note for
JTRST signal.
Signal Name: TEST
Signal Description: Factory Test Input
Signal Type: Input (with internal 10kΩ pullup)
This input should be left open circuited by the user.
Signal Name: V
SS
Signal Description: Digital Ground Reference
Signal Type: N/A
All V
SS
signals should be tied together.
Signal Name: V
DD
Signal Description: Digital Positive Supply
Signal Type: N/A
3.3V (±5%). All V
DD
signals should be tied together.