LMH0341_09 Datasheet, PDF (19/28 Pages) National Semiconductor (TI) – 3 Gbps, HD, SD, DVB-ASI SDI Deserializer with Loopthrough and LVDS Interface

Register Descriptions
the following table provides details on the device's configura-
tion registers.
DES Register Detail Table
ADD 'h Name
Bits Field
R/W Default Description
00
device_identifica The seven MSBs of this register define the SMBus address for the device. The default value is 0x58h,
tion
but this may be overwritten. The LSB of this register must always be '0' Note that since the address
is shifted over by one bit, some systems may address the 058h as 'B0h
7:1 device_id
r/w
058h SMBus Device ID
0
reserved
0
01
reset
If a '1' is written into the LSB of register 0x01h then the device will do a soft reset, restoring it's internal
state to the same as at powerup with the exception of the contents of register 0x00h, which if modified
will remain unchanged
7:1 reserved
0
sw_rst
r/w
0'b Software Reset
02
GPIO_0
This register configures GPIO_0. 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 register
0001: signal detect 0
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
03
GPIO_1
This register configures GPIO_1. 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: POR
0001: GP_OUT[1]
0010:signal detect 1
0011:cdr_lock
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
19
www.national.com