PM4314 QDSX
DATA SHEET
PMC-950857
ISSUE 5
QUAD T1/E1 LINE INTERFACE DEVICE
Pin Name
Type
Input
Pin
No.
Function
TDD[4]
TDD[3]
TDD[2]
TDD[1]
68
Transmit Data (TDD[4:1]). When in single-rail
mode, these inputs are the NRZ data signals to
be transmitted. These inputs can be configured
to be active high or active low. These inputs can
be sampled on either the rising or falling edges of
the corresponding TCLKI[4:1].
71
74
77
TDP[4]
TDP[3]
TDP[2]
TDP[1]
TDN[4]
TDN[3]
TDN[2]
TDN[1]
Input
Input
Transmit Positive Data (TDP[4:1]). When in dual-
rail mode, these inputs are the NRZ positive data
signals to be transmitted. These inputs can be
sampled on either the rising or falling edges of
the corresponding TCLKI[4:1].
67
70
73
76
Transmit Negative Data (TDN[4:1]). When in
dual-rail mode, these inputs are the NRZ
negative data signals to be transmitted. These
inputs can be sampled on either the rising or
falling edges of the corresponding TCLKI[4:1].
These input pins are ignored if the device is
configured for single-rail (unipolar) transmit mode.
TCLKI[4]
TCLKI[3]
TCLKI[2]
TCLKI[1]
RXTIP[4]
RXTIP[3]
RXTIP[2]
RXTIP[1]
Input
Input
69
Transmit Clock (TCLKI[4:1]). This clock should be
1.544 MHz for DS1 or 2.048 MHz for E1 data
streams and is used to sample the corresponding
TDP/TDD[4:1] and TDN[4:1] signals.
72
75
78
64
Receive Bipolar Tip (RXTIP[4:1]). The
RXTIP[4:1] inputs are the receive analog positive
pulses. They must be connected to the positive
lead of the transformer secondary through a
passive attenuation network.
39
103
128
63
RXRING[4] I/O
RXRING[3]
Receive Bipolar Ring (RXRING[4:1]). The
RXRING[4:1] bidirectional pins provide DC bias
to an external isolation transformer. They must
be connected to the negative lead of the
transformer secondary and to a decoupling
capacitor to RAVS[4:1].
40
RXRING[2]
104
127
RXRING[1]
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
20
PMC [ PMC-SIERRA, INC ]
