XRT7302IQ80 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT7302IQ80' PDF : 77 Pages View PDF
XRT7302 2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
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REV. 1.1.0
PIN DESCRIPTION
PIN #
18
SIGNAL NAME
SClk/(RxOFF2)
19
SDI/(RxOFF1)
20
SDO/(E3_Ch1)
TYPE
I
I
I/O
DESCRIPTION
Microprocessor Serial Interface Clock Signal/"Channel 2 Receiver Shut
OFF" Input:
The exact role that this particular pin plays depends upon whether the
XRT7302 device is operating in the "Host" Mode or in the "Hardware" Mode.
Host Mode - Microprocessor Serial Interface Clock Signal:
This signal will be used to sample the data, on the SDI pin, on the rising edge.
Additionally, during "Read" operations, the Microprocessor Serial Interface will
update the SDO output on the falling edge of this signal.
Hardware Mode - Channel 2 Receiver Shut OFF input pin:
Setting this input pin "high" shuts off the Receive Section within Channel 2.
Conversely, setting this input pin "low" enables the Receive Section for full
operation.
Serial Data Input for the Microprocessor Serial Interface/Channel 1 -
Receiver Shut OFF Input pin:
The exact function of this input depends upon whether the XRT7302 device is
operating in the "Host" Mode or in the "Hardware" Mode.
Host Mode - Serial Data Input for the Microprocessor Serial Interface:
Whenever the user wishes to read or write data into the Command Registers,
over the Microprocessor Serial Interface; the user is expected to apply the
"Read/Write" bit, the Address Values (of the Command Registers) and Data
Value to be written (during "Write" Operations) to this pin.
This input will be sampled on the rising edge of the SClk pin (pin 18).
Hardware Mode - Channel 1 Receiver Shut OFF Input pin:
Setting this input pin "high" shuts off the Receive Section within Channel 1.
Conversely, setting this input pin "low" enables the Receive Section for full
operation.
Serial Data Output from the Microprocessor Serial Interface/E3_Mode
Select - Channel 1:
The exact functionality of this pin depends upon whether the XRT7302 device
is operating in the "Host" Mode or in the "Hardware" Mode.
Host Mode Operation - Serial Data Output for the Microprocessor Serial
Interface:
This pin will serially output the contents of the specified Command Register,
during "Read" Operations. The data, on this pin, will be updated on the falling
edge of the SClk input signal. This pin will be tri-stated upon completion of
data transfer.
Hardware Mode Operation - E3 Mode Select - Channel 1:
This input pin permits the user to configure Channel 1 (within the XRT7302
device) to operate in the E3 or STS/DS3 Modes. Setting this input pin to
"HIGH" configures Channel 1 to operate in the "E3" Mode. Setting this input
pin to "LOW" configures Channel 1 to operate in either the DS3 or STS-1
Modes (depending upon the state of the "STS-1/DS3_Ch1 input pin (pin 21).
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