1.0 Product Description
CX28394/28395/28398
1.2 Pin Assignments
Quad/x16/Octal—T1/E1/J1 Framers
Table 1-6. Hardware Signal Definitions (8 of 9)
Pin Label
Signal Name
Device (1)
Joint Test Access Group (JTAG)
I/O
Definition
TCK
JTAG Clock
4, 5, 8
I
Clock input samples TDI on rising edge and outputs TDO
on falling edge.
TDI1, TDI2
JTAG Test Data
Input
5
I
Test data input per IEEE Std 1149.1-1990. Used for
loading all serial instructions and data into internal test
logic. Sampled on the rising edge of TCK. TDI can be left
unconnected if it is not being used because it is pulled up
internally. TDI1 is the test data input for framers 1 to 8,
TDI2 is the test data input for framers 9 to 16.
TDI
JTAG Test Data
Input
4, 8
I
I
Test data input per IEEE Std 1149.1-1990. Used for
loading all serial instructions and data into internal test
logic. Sampled on the rising edge of TCK. TDI can be left
unconnected if it is not being used because it is pulled up
internally.
TMS
JTAG Test mode
Select
4, 5, 8
Active low test mode select input per IEEE Std
1149.1-1990. Internally pulled-up input signal used to
control the test-logic state machine. Sampled on the
rising edge of TCK. TMS can be left unconnected if it is
not being used because it is pulled up internally.
TDO
JTAG Test Data
Output
4, 8
O
O
Test data output per IEEE Std 1149.1-1990. TDO is a
three-state output used for reading all serial
configuration and test data from internal test logic.
Updated on the falling edge of TCK.
TDO1, TDO2
JTAG Test Data
Output
5
Test data output per IEEE Std, 1149.1-1990. TDO is a
three-state output used for reading all serial
configuration and test data from internal test logic.
Updated on the falling edge of TCK. TDO1 is the test data
output for framers1 to 8, TDO2 is the test data output for
framers 9 to 16.
TRST*
JTAG Reset
4, 5, 8
I
Active low input to initialize Tap Controller.
Power Supply
VDD
VSS
VGG
Power
4, 5, 8
4, 5, 8
4, 5, 8
I
I
I
+3.3 Vdc ±5%.
Ground
0 Vdc.
High Voltage
Power
+3.3 Vdc ±5%. Connect to +5 Vdc ±5% to ensure 5 V
tolerance in applications which include 5 V logic driving
signals.
1-38
Conexant
100054E
CONEXANT [ CONEXANT SYSTEMS, INC ]
