GDC21D003 Datasheet, PDF (66/77 Pages) Hynix Semiconductor – VSB Receiver

6.6.8 I/F to Transport Demultiplexer
The VSB Channel Decoder offers various functions
for the interface with the Transport Demultiplexer
which are controlled by I²C register64.
GDC21D003
The related I²C register64 flags are given in Table
6.6.3.
Table 6.6.3 I²C Register64 Flags controlling Transport Demultiplexer I/F
Pase
Derand_on
Errorflag_ins
Vsbdvalid_pol
Vsbclk_sup
Parallel/serial output selection
‘1’ : parallel ‘0’ : serial
If this bit is set to ‘0’, VSBDATA[0] pin is used as serial data output and
VSBDATA[7] is used as start bit of a byte indicator.
Default value is ‘1’.
Derandomizer on/off selection
‘1’ : on
‘0’ : off
If this bit is set to ‘0’, derandomizer is bypassed. Default value is ‘1’.
Error flag bit insertion on/off selection. Valid only when Derand_on is set to ‘1’.
‘1’ : MSB of first data byte is set to ‘1’ when the packet has an uncorrected
errors(when NVSBERRFLG is ‘0’)
‘0’ : nothing is done at the MSB of first data byte although the packet has an
uncorrected errors(when NVSBERRFLG is ‘0’)
Default value is ‘1’.
VSBDVALID polarity indicator
‘1’ : VSBDATA[7:0] is valid during VSBDVALID = ‘1’ interval and invalid
during VSBDVALID = ‘0’ interval.
‘0’ : polarity is inverted
Default value is ‘1’.
VSBCLK suppression indicator
‘1’ : VSBCLK is not suppressed during VSBDVALID = “invalid” interval
‘0’ : VSBCLK is suppressed(set to 0) during VSBDVALID = ”invalid” interval
Default value is ‘1’.
The rising edge of VSBCLK signal occurs at the middle of one byte interval of VSBDATA[7:0] signal. The
VSBSOP signal indicates the location of the data segment sync(start byte of a data segment) using VSBSOP=‘1’
for one byte interval. At the default value of I²C register64,
1) the signal VSBDVALID=’1’ and VSBDVALID=’0’ indicate valid data and invalid data interval respectively,
2) the signal NVSBERRFLG=’0’ indicates that the data segment has uncorrected errors.
Otherwise NVSBERRFLG=’1’,
3) the data segment sync is set to 47H,
4) the MSB of the first data byte is set to ‘1’ if the data segment has uncorrected errors(NVSBERRFLG=’0’),
5) the VSBCLK signal is not suppressed during VSBDVALID=’0’ interval. See Fig. 6.6.8.
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