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Si5040
Table 13. Si5040 Pin Descriptions (Continued)
Pin
2
Name
RX_LOL
Type*
DO
Level
LVTTL
Description
Receiver Loss of Lock (Active High).
This output is asserted when the receiver path is in the loss-
of-lock state. If enabled in the receiver Interrupt Mask register,
this event may cause an interrupt. This pin is reflected as bit 4
in Register 9. The latched version of this pin is in Register 5,
bit 4.
In the absence of an external reference, the lock detect
circuitry uses a data quality measure to determine when
frequency lock has been lost with the incoming data stream.
This pin may also be programmed as a 622 MHz clock output
that is synchronous to the data applied at the transmitter data
(TD) input.
3
RX_LOS
DO
LVTTL
Receiver Loss of Signal (Active High).
The RX_LOS output is asserted when a loss-of-signal condi-
tion occurs for Analog LOS, Digital Count LOS, or Signal
Quality Monitor LOS.
22,21
30,29
TD+
TD–
TXDOUT+
TXDOUT–
AI
AO
Differential CML Transmitter Data Input.
High-speed XFI-compliant transmitter data input.
Differential CML Transmitter Data Output.
Data present at the TD input is retimed and output on the
TXDOUT pins.
Transmit range of operation is 9.8304 Gbps to 11.3 Gbps.
Serial Port
24
SCK
DI
LVTTL
Serial Clock.
Clock input for SPI-like and I 2 C interface.
25
SD
DIO
LVTTL
Serial Data.
or
Open Drain
Serial bidirectional data interface pin for the SPI-like or I 2 C
serial interface. This pin may be programmed as LVTTL or
open drain (by default) in Register 2. When in LVTTL mode,
the pin is initially in a high-impedance state.
9
SPSEL
DI
LVTTL
SPI-like or I 2 C Bus Select.
In a logic low state, this input selects I 2 C mode of operation. In
a logic high state, SPI-like mode of operation is selected. This
input has a weak internal pullup.
26
SS
DI
LVTTL
Chip Select.
Chip select pin for SPI-like interface, active low. This input has
a weak internal pullup. Note that this pin defines the I 2 C when
the serial interface is in I 2 C mode. See "10.1. I2C Interface" on
page 35 for details.
*Note: TYPE: P = Power; AI = Analog Input; AO = Analog Output; DI = Digital Input; DO = Digital Output; DIO = Digital
Input/Output.
Rev. 1.3
101
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