
16
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PRELIMINARY
E3 UNI FOR ATM
XRT7234
REV. P1.0.0
PIN DESCRIPTION
Pin
No.
100 Pin Package
Pin No. 160
PinPackage
Symbol
Type
Description
3
1
D15
I/O
MSB of Bi-Directional Data Bus (Microprocessor Interface Section):
This pin, along with pins D0–D14, function as the Microprocessor Interface
bi-directional data bus, and is intended to be interfaced to the “l(fā)ocal”
microprocessor. This pin is inactive if the Microprocessor Interface block
is configured to operate over an 8 bit data bus.
2
TAOS
O
“Transmit All Ones Signal” (TAOS) Command (for the XR-T7296 E3
Line Transmitter IC).
This output pin is intended to be connected to the TAOS input pin of the
XR-T7296 E3 Line Transmitter IC. The user can control the state of this
output pin by writing a ‘0’ or ‘1’ to Bit 4 (TAOS) of the Line Interface Drive
Register (Address = 84h). If the user commands this signal to toggle
“high” then itwill force the XR-T7296 E3 Line Transmitter IC to transmit
an “All Ones” pattern onto the line. Conversely, if the user commands
this output signal to toggle “l(fā)ow” then the XR-T7296 E3 Line Transmitter
IC will proceed to transmit data based upon the pattern that it receives
via the TxPOS and TxNEG output pins.
Writing a “1” to Bit 4 of the Line Interface Drive Register (Address = 84h)
will cause this output pin to toggle “high”. Writing a “0” to this bit-field will
cause this output pin to toggle “l(fā)ow”.
Note:
If the customer is not using the XR-T7296 E3 Line Transmitter IC,
then he/she can use this output pin for a variety of other purposes.
4
3
D14
I/O
Bi-directional Data bus (Microprocessor Interface Section):
This pin
is inactive if the Microprocessor Interface block is configured to operate
over an 8 bit data bus. (Please see description for D15)
5
4
D13
I/O
Bi-directional Data bus (Microprocessor Interface Section):
This pin
is inactive if the Microprocessor Interface block is configured to operate
over an 8 bit data bus. (Please see description for D15)
6
5
D12
I/O
Bi-directional Data bus (Microprocessor Interface Section):
This pin
is inactive if the Microprocessor Interface block is configured to operate
over an 8 bit data bus. (Please see description for D15)
6
DMO
I
“Drive Monitor Output” Input (from the XR-T7296 E3 Line Transmitter
IC).
This input pin is intended to be tied to the DMO output pin of the XR-T7296 E3
Line Transmitter IC. The user can determine the state of this input pin by
reading Bit 2 (DMO) within the Line Interface Scan Register (Address = 85h).
If this input signal is “high”, then it means that the drive monitor circuitry
(within the XR-T7296 E3 Line Transmitter IC) has not detected any bipolar
signals at the MTIP and MRING inputs within the last 128 ± 32 bit-periods. If
this input signal is “l(fā)ow”, then it means that bipolar signals are being
detected at the MTIP and MRING input pins of the XR-T7296 device.
Note:
If this customer is not using the XR-T7296 E3 Line Transmitter IC,
then he/she can use this input pin for a variety of other purposes.