GS1670A Datasheet, PDF (51/130 Pages) Gennum Corporation – Ancillary data extraction

• 1/1.001 rate detection for 2K standards
• CEA-861 timing generation for 2K standards
• Automatic enabling of audio extraction
This enhancement is an interface between the GS1670A and the customer system. The
behaviour of the GS1670A with or without the additional 2K enhancement FPGA code
is identical from a user-perspective.
GS1670A
Level_B
FPGA
PLL
÷1
÷2
0
1
GIb_MUX
GIb_Buf
Pclk_div2
Pclk
GS1670A_GSPI_SDI
Host_GSPI_CS
GS1670A_GSPI_CS
Host_GSPI_SCLK
GS1670A_GSPI_SCLK
Host_GSPI_SDI
GS1670A_GSPI_SDOUT
Host_GSPI_SDOUT
STAT3
Host_GSPI_busy
STAT4
Level_B
STAT5
WO_2K
rate_m_o
clk_27M_ref
std_2K_det_o
reset
dy_out_o[9:0]
smpte_bypass_i
dc_out_o[9:0]
tim_861
fvh_o[2:0]
dy_in_i[9:0]
dc_in_i[9:0]
fvh_i[2:0]
Level_B
Host
Interface
Control
Vid_Out[19:0]
HVF[2:0]
Figure 4-20: 2K Feature Enhancement
4.13 Data Format Detection & Indication
In addition to detecting the video standard, the GS1670A detects the data format, i.e.
SDTI, SDI, TDM data (SMPTE 346M), etc.
This information is represented by bits in the DATA_FORMAT_DSX register accessible
through the host interface.
Data format detection is only carried out when the LOCKED signal is HIGH.
By default (at power up or after system reset), the DATA_FORMAT_DSX register is set to
Fh (undefined). This register is also set as undefined when the LOCKED signal is LOW
and/or the SMPTE_BYPASS pin is LOW.
Table 4-12: Data Format Register Codes
YDATA_FORMAT[3:0] or
CDATA_FORMAT[3:0]
0h ~ 05h
Data Format
SDTI
6h
SDI
7h
Reserved
Remarks
SMPTE 321M, SMPTE 322M,
SMPTE 326M
−
−
GS1670A HD/SD SDI Receiver
Data Sheet
54388 - 1
September 2012
51 of 130