lmh0041sqx National Semiconductor Corporation, lmh0041sqx Datasheet - Page 18

• Manufacturer Part Number: lmh0041sqx
• Description: 3g, Hd, Sd, Dvb-asi Sdi Deserializer With Loopthrough And Lvds Interface
• Manufacturer: National Semiconductor Corporation

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Register Descriptions
the following table provides details on the device's configura-
tion registers.
DES Register Detail Table
ADD 'h Name
00
01
02
03
device_identifica
tion
reset
GPIO_0
Configuration
GPIO_1
Configuration
Bits
The seven MSBs of this register define the SMBus address for the device. The default value is 0x58h,
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
0
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
0
This register configures GPIO_0. Note, if this pin is to be used as an input, then the output must be
TRI-STATE (bit[0]=’0’) and if used as an output, then the input buffer must be disabled (bit[1]=’0’).
7:4
3:2
1
0
This register configures GPIO_1. Note, if this pin is to be used as an input, then the output must be
TRI-STATE (bit[0]=’0’) and if used as an output, then the input buffer must be disabled (bit[1]=’0’).
7:4
3:2
1
0
Field
device_id
reserved
reserved
sw_rst
GPIO_0_mode
[3:0]
GPIO_0_ren
[1:0]
GPIO_0_sleep
z
GPout0 enable
GPIO_0_mode
[3:0]
GPIO_0_ren
[1:0]
GPIO_0_sleep
z
GPout0 enable
R/W
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
18
Default
0000'b
0000'b
058h
01'b
01'b
0'b
0'b
1'b
0'b
1'b
0
Description
SMBus Device ID
Software Reset
0000: GPout register
0001: signal detect 0
all others: reserved
00: pullup and pulldown disabled
01: pulldown enabled
10: pullup enabled
11: Reserved
0: input buffer disabled
1: input buffer enabled
0: output TRI-STATE
1: output enabled
0000: POR
0001: GP_OUT[1]
0010:signal detect 1
0011:cdr_lock
all others: reserved
00: pullup and pulldown disabled
01: pulldown enabled
10: pullup enabled
11: Reserved
0: input buffer disabled
1: input buffer enabled
0: output TRI-STATE
1: output enabled