QT2022/32 - Data Sheet: DS3051
Table 3: QT2022/32 Ball Assignment & Signal Description (Continued)
Ball
Signal Name
Dir.
Type
Description
E5
TDCC_CLK
O
CMOS open drain
(see note1)
QT2032:
Gapped clock used for timing TDCC input.
Please see Section 7.3.8, “Transport Overhead Serial Interface,” on
page 48
QT2022:
Unused. Connect to GND.
D7
F3
TDO
LASI
O
O
CMOS open drain
(see note1)
Test data output (scan out when SCAN instruction written to TAP).)
CMOS open drain
Link Alarm Status Interrupt (LASI)
logic low = Interrupt asserted
logic high =No alarm interrupt asserted
See “Link Alarm Status Interrupt Pin (LASI)” on page 62.
C12
D9
TXENABLE
(XFPTXDIS)
O
O
CMOS open drain
With XFP=0, Active high laser driver enable as per XENPAK MSA
(see “Laser Driver Enable Pin (TXENABLE)” on page 69)
With XFP=1, drives TX_DIS input of XFP module
LOSOUTB
(XFPPDN)
CMOS (see note1)
open drain
With XFP=0, low level indicates when the input signal applied at RXIP/N is
below a threshold which can be adjusted via the resistor connected to the
ITH_LOS pin
With XFP=1, drives P_DOWN/RST input of XFP module
Bidirectional CMOS IO (note: all CMOS I/O are 3.3V tolerant & outputs are open drain)
D10
EEPROM_SCL
EEPROM_SDA
MDIO
I/O
CMOS (see note1)
bidirectional open
drain
EEPROM serial interface clock.
can be tristated via MDIO register 1.C024h.0 This is a bidirectional pin to
allow an external device to take control of the EEPROM I2C interface.
With XFP=1, drives the XFP module I2C interface.
hysteresis
D11
I/O
CMOS (see note1)
bidirectional open
drain
EEPROM interface serial address/data.
With XFP=1, drives the XFP module I2C interface.
hysteresis
G4
H4
I/O
I/O
CMOS
bidirectional open
drain
MDIO Interface serial data signal
External pullup to 1.2V required. Please see Section 9.5 on page 74 for
details.
TXON
(XFPMODDESEL
)
CMOS bidirectional
open drain with 50kΩ
pullup to 1.2V
With XFP=0, low power mode control input
0 = low power mode (only the MDIO, EEPROM and DOM functions are
active with an external reference clock applied at EREFCLKP/N)
1 = normal operating mode, default
(output in XFP mode)
With XFP=1, output to drive the MOD_DESEL input of an XFP module
Miscellaneous
E4 LED1
I/O
CMOS input or 10mA
open drain output
LED driver and General Purpose I/O:
Can be configured as a LED driver output or as a GPIO via MDIO register
bits 1.D006h.2:0. The default configuration is as a LED driver.
As an input, its state is displayed in MDIO register bit 1.D006h.5; as an
output it can be driven by MDIO register bits 1.D006h.2:0 or other internal
status signals
(see Section 8.6 on page 70)
18
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