LMH0341_09 Datasheet, PDF (20/28 Pages) National Semiconductor (TI) – 3 Gbps, HD, SD, DVB-ASI SDI Deserializer with Loopthrough and LVDS Interface

ADD 'h Name
Bits Field
R/W Default Description
04
GPIO_2
This register configures GPIO_2. Note, if this pin is to be used as an input, then the output must be
Configuration TRI-STATE (bit[0]=’0’) and if used as an output, then the input buffer must be disabled (bit[1]=’0’).
7:4 GPIO_0_mode r/w
[3:0]
0000'b
0000: GPout [2]register
0001:Always ON clock
0010: LVDS TX CLK
0011:CDR_CLK
all others: reserved
3:2 GPIO_0_ren
r/w
01'b 00: pullup and pulldown disabled
[1:0]
01: pulldown enabled
10: pullup enabled
11: Reserved
1
GPIO_0_sleep r/w
z
0'b 0: input buffer disabled
1: input buffer enabled
0
GPout0 enable r/w
1'b 0: output TRI-STATE
1: output enabled
05
GP Input
If any of the GPIO pins are configured as inputs, then reading from this register provides the values
on those input pins
7:3 Reserved
2
r
Input data on GPIO 2
1
r
Input data on GPIO 1
0
r
Input data on GPIO 0
06
GP Output
If the GPIO ins are configured as General Purpose output pins, then writing to this register has the
effect of transferring the bits in this register to the output buffers of the GPIO pins.
7:3 Reserved
2
r/w
Output data on GPIO 2
1
r/w
Output data on GPIO 1
0
r/w
Output data on GPIO 0
07–0C Reserved
0D
DVB_ASI Idle_A When in DVB_ASI mode, idle characters are inserted into the datastream when there is no valid data
to transmit. This character is recognized by the receiver. The default character is K28.5 but if desired
that can be redefined via this register pair
7:0
r/w
83 Data [7:0]
0E
DVB_ASI Idle_B DVB_ASI idle character MSBs
7:2 Reserved
1:0
r/w
2
Data[9:8]
0F–1C Reserved
1D
Variant
Reading from this register will return an 8 bit value which indicates which variant of the DES is being
addressed
7:6 Reserved
r
5
Loop through
enable
r
pin value This bit returns the state of the loop-through enable,
and defaults to the same as the state of the
Loopthru_EN pin
4:3 mode
r
pin value Returns a two bit pattern which indicates the state that
the device is in
00,01,10: Standard Video Mode
11: DVB_ASI Mode
2
Reserved
1:0 Variant
r
returns the part type:
00: LMH0341
01: LMH0041/LMH0051
10:LMH0071
11:Reserved
1E-1F Reserved
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