QT2022/32 - Data Sheet: DS3051
Table 3: QT2022/32 Ball Assignment & Signal Description (Continued)
Ball
Signal Name
Dir.
Type
Description
K1
K2
VCXOIP
VCXOIN
I
CML
QT2032:
Input clock from VCXO when an external VCXO is used for the fiber side
TXPLL reference clock input in WAN-mode;
155.52MHz or 622.08MHz selected by VCXOSEL622 pin;
AC coupled with on chip 50Ω terminations to 1.2V.
QT2022:
Unused. Leave unconnected.
N10
N11
RXIP
RXIN
I
I
I
I
I
CML
CML
CML
CML
CML
10Gb/s receive data in, 100Ω differential impedance.
A8
B8
TxXAUI0P
TxXAUI0N
Transmit 3.125Gb/s data to QT2022/32 from XAUI interface - lane 0
Transmit 3.125 Gb/s data to QT2022/32 from XAUI interface - lane 1
Transmit 3.125 Gb/s data to QT2022/32 from XAUI interface - lane 2
Transmit 3.125 Gb/s data to QT2022/32 from XAUI interface - lane 3
A6
B6
TxXAUI1P
TxXAUI1N
A4
B4
TxXAUI2P
TxXAUI2N
A2
B2
TxXAUI3P
TxXAUI3N
DC Monitor Points
D1
TxXMONCVP
O
O
analog
analog
Monitor test point for the transmit XAUI interface (DC signal).
Used for monitoring only. Leave unconnected.
D2
TxXMONCVN
Monitor points for the transmit XAUI interface (DC signal)
Used for monitoring only. Leave unconnected.
Connection Points for External Components
M13
M14
L12
RXICXP
analog
analog
analog
Connection point for external 100nF cap to ground
Connection point for external 100nF cap to ground
For test purposes only.
RXICXN
PHASE_OFFSET
N13
F14
F13
ITH_LOS
RxXLEVEL
XBIAS
analog
analog
analog
analog
Internal fiber receive path loss of signal (LOS) detector threshold adjust.
See Section 8.7.1 on page 72 for details.
connection point for external resistor to set receive XAUI drivers’ output
level.
XAUI bias current control
6.49 kΩ resistor to GND.
P14
P13
RXFP
RXFN
Receive charge pump filter connection points
see “External Components” on page 209 for external component
connections
N14
P4
RXIPMP
analog
Receive charge pump current control
6.49 kΩ resistor to GND
TXLEVEL
analog
analog
external resistor used to control 10.3125 Gb/s output data amplitude.
L4
M4
TXFP
TXFN
Transmit loop filter - see “External Components” on page 209 for external
components
14
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