LMH0340SQE Datasheet, PDF (14/30 Pages) Texas Instruments – 3 Gbps, HD, SD, DVB-ASI SDI Serializer and Cable Driver With LVDS Interface

LMH0040, LMH0050
LMH0070, LMH0340
SNLS271I – APRIL 2007 – REVISED APRIL 2013
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FPGA
Host
3V3
SMBus
SMBus
SMBus
Device
Device
Device
3V3
3V3
3V3
Figure 11. SMBus Configuration 3 — Host to multiple devices with multiple SMBus Interfaces
GENERAL PURPOSE I/O PINS GPIO[2:0]
The SER has three pins which can be configured to provide direct access to certain register values via a
dedicated pin. For example if a particular application required fast action to the condition of the serializer losing
it’s input clock, the TXCLK detect status bit could be routed directly to an external pin where it might generate an
interrupt for the host processor. GPIO pins can be configured to be in TRI-STATE® (High Impedance) mode, the
buffers can be disabled, and when used as inputs can be configured with a pullup resistor, a pulldown resistor or
no input pin biasing at all. When the GPIO pins are being used as inputs, there is the ability to have an internal
pullup or pull down resistor. This is selected via the GPIO Configuration registers.
Each of the GPIO pins has a register to control it. For each of these registers, the upper 4 bits are used to define
what function is desired of the GPIO pin with options being slightly different for each of the three GPIO pins. The
pins can be used to monitor the status of various internal states of the SER device, to serve as an input from
some external stimulus, and for output to control some external function.
GPIO_0 FUNCTIONS
Allow for the output of a signal programmed by the SMBus
Allow the monitoring of an external signal via the SMBus
Monitor Status of TXCLK signal
Monitor Status of TXCLKDetect
Monitor Power On Reset
GPIO_1 FUNCTIONS
Monitor Power On Reset
Allow for the output of a signal programmed by the SMBus
Allow the monitoring of an external signal via the SMBus
Monitor LOS for data bit 0
Monitor LOS for data bit 1
Monitor LOS for data bit 2
Monitor LOS for data bit 3
Monitor LOS for data bit 4
GPIO_2 FUNCTIONS
Allow for the output of a signal programmed by the SMBus
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