32
Agere Systems Inc.
TMXF28155 Supermapper
155/51 Mbits/s SONET/SDH x28/x21 DS1/E1
Data Sheet
June 2002
3 Pin Information
(continued)
3.3.10 Test Pins
These pins are for factory test purposes only and must be connected as stated below for normal operation. They
are used to establish special configurations for testing, inserting test data, etc. For normal operation, they should
be left unconnected; each is equipped with a pull-up or pull-down to the inactive (normal operation) state.
Table 16. Test Pins
Table 17. CDR Power
Pin
N5
Symbol
SCAN_EN
Type
—
I/O
I
Description
Pull-down
I
Pull-down
I
Pull up
I
Pull-down
I
Pull-down
I
Pull-down
Test Only.
Scan enable (active-high).
M5
SCAN_MODE
—
Test Only.
Serial scan input for testing (active-high).
P5
IDDQ
—
Test Only.
I
DD
Q input (active-high).
AE14
BYPASS
—
Test Only.
Enables functional bypassing of the clock synthe-
sis with a test clock (active-high).
Test Only.
Controls bypass of 32 PLL-generated phases with
32 low-speed phases, generated by test logic (active-high).
Test Only.
Enables external test control of 155 MHz clock
phase selection through ETOGGLE and EXDNUP inputs
(active-high).
Test Only.
Moves 155 MHz clock selection one phase per
positive pulse > 20 ns. Active + pulse.
Test Only.
Direction of phase changes.
0 = down.
1 = up.
Test Only.
Enables CDR test mode.
AF14
TSTPHASE
—
AD14
ECSEL
—
AC15
ETOGGLE
—
I
Pull-down
I
Pull-down
AE15
EXDNUP
—
AF15
TSTMODE
—
I
Pull-down
I
Pull-down
O
AD15
TSTSFTLD
—
Test Only.
Enables CDR test mode shift register.
AE16,
AC16
TSTMUX[1:0]
—
Test Only.
CDR test mode output.
Pin
AC9
AB12
Symbol
VDDA_CDR
VSSA_CDR
Type
—
—
I/O
I
I
Description
Analog Power.
Isolated analog power supply V
DD
for CDR.
Analog Ground.
Isolated analog power supply V
SS
for CDR.
Table 18. LVDS Control Pins
Pin
AF12
AE12
AC11
AD12
Symbol
RESHI
RESLO
REF10
REF14
Type
—
I/O
I
Description
Resistor 1, 2.
A 100
1% resistor should be connected between
these two pins as a reference for the LVDS input buffer termination.
—
—
I
I
Voltage Reference 1.
1.0 V reference voltage input.
Voltage Reference 2.
1.4 V reference voltage input.