![](http://datasheet.mmic.net.cn/Exar-Corporation/XRT83SH38IB-F_datasheet_100155/XRT83SH38IB-F_19.png)
XRT83SH38
16
REV. 1.0.7
8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
SERIAL PORT AND JTAG
SIGNAL NAME
BGA
LEAD #
TYPE
DESCRIPTION
SER_PAR
P18
I
Serial/Parallel Select Input (Host Mode Only)
This pin is used in the Host mode to select between the parallel microprocessor
or serial interface. By default, the Host mode operates in the parallel micropro-
cessor mode. To configure the device for a serial interface, this pin must be
pulled "HIgh".
NOTE: Internally pulled “Low” with a 50k
resistor.
SCLK
T13
I
Serial Clock Input (Host Mode Only)
If Pin SER_PAR is pulled "High", this input pin is used the timing reference for
the serial microprocessor interface. See the Microprocessor Section of this
datasheet for details.
SDI
C10
I
Serial Data Input (Host Mode Only)
If Pin SER_PAR is pulled "High", this input pin from the serial interface is used
to input the serial data for Read and Write operations. See the Microprocessor
Section of this datasheet for details.
SDO
R7
O
Serial Data Output (Host Mode Only)
If Pin SER_PAR is pulled "High", this output pin from the serial interface is used
to read back the regsiter contents. See the Microprocessor Section of this
datasheet for details.
JTAGtip
JTAGring
E18
B18
Analog JTAG Positive Pin
Analog JTAG Negative Pin
TDO
B1
Test Data Out
This pin is used as the output data pin for the boundary scan chain.
TDI
R1
Test Data In
This pin is used as the input data pin for the boundary scan chain.
TCK
N1
Test Clock Input
This pin is used as the input clock source for the boundary scan chain.
TMS
E1
Test Mode Select
This pin is used as the input mode select for the boundary scan chain.
NC
A1
A18
N18
P18
V1
V18
****
No Connect Pins