LMH0340_09 Datasheet, PDF (20/26 Pages) National Semiconductor (TI) – 3 Gbps, HD, SD, DVB-ASI SDI Serializer and Cable Driver with LVDS Interface

ADD
'h
11
12
13–1C
1D
1E-20
21
22
23
24
25
26
Name
Bits
Field
R/W Default Description
DVB_ASI Idle_A
When in DVB-ASI mode, idle characters are inserted into the datastream when there is no valid
data to transmit. The idle character default is K28.5 but if desired, that can be redefined via this
register pair.
7:0
r/w
BC'h
K28.5 Idle character used for DVB_ASI
DVB_ASI Idle_B DVB-ASI mode, idle character LSBs
7:2
Reserved
1:0
r/w
01'b
K28.5 Idle character used for DVB_ASI
Reserved
Device Type
Reading from this register will return an 8 bit value which indicates which product from the SER
family is being addressed
7:0
Device
r
xx1xxx00 for the LMH0340
xx1xxx01 for the LMH0040
xx1xxx10 for the LMH0070
xx0xxx01 for the LMH0050
Reserved
Mode
This register returns the mode that the device is operating in.
7:2
Reserved
1:0
r/w
11 = DVB ASI mode
01,10, 00 = SDI mode
DVB_ASI Override In normal operation, the DVB_ASI mode is selected via the external pin. By setting the 0 bit in
this register, the function of this pin is overridden, and the mode is set via register 21'h instead.
After setting this bit, a channel reset must be executed via reg 0x26h, bit 7
7:1
Reserved
0
r/w
0'b
1: contents of register 21h will override
the DVB_ASI pin
0: Pin control
Reserved
LVDS Clock Delay This register selects of the TXCLK delay adjust is enabled or bypassed.
Bypass
7
r/w
0'b
1: Bypasses TXCLK delay
0: Delay Enabled
6:0
Reserved
Reserved
Powerdown
Individual bits from this register can power down different parts of the SER – to place the part
into a low power standby mode, write a ‘0’ to this register.
7
channel reset
r/w
0'b
Used to reset the channel, needed
when changing between DVB_ASI
mode and normal operating mode via
SMBus
6:0
Powerdown
r/w
0x3Fh
for normal operation, write x011 1111b
to this register. For low power mode
write x100 0000b to the register.
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