GS2970 Datasheet, PDF (74/145 Pages) Semtech Corporation – 3Gb/s, HD, SD SDI Receiver Complete with SMPTE Audio and Video Processing

Application Layer
Read Pointer
Bank A
0 ANCDATA
ANC DATA
ANC DATA
ANC DATA
ANC DATA
ANC DATA
ANC DATA
ANC DATA
ANC DATA
Internal Write
800h Pointer
Bank B
0
800h
1023
BFFh
1023
BFFh
ANC_DATA_SWITCH = HIGH
Figure 4-30: Ancillary Data Extraction - Step B
To read the new data, toggle the ANC_DATA_SWITCH bit LOW. The old data in Bank A
is cleared to zero and extraction continues in Bank B (see Figure 4-31: Ancillary Data
Extraction - Step C).
Bank A
0
Application Layer
Read Pointer
800h
0
Bank B
ANC DATA
ANC DATA
ANC DATA
ANC DATA
ANC DATA
ANC DATA
Internal Write
Pointer
ANC DATA
800h
1023
BFFh
1023
BFFh
ANC_DATA_SWITCH = LOW
Figure 4-31: Ancillary Data Extraction - Step C
GS2970 3Gb/s, HD, SD SDI Receiver Complete with
SMPTE Audio and Video Processing
Data Sheet
47478 - 4
September 2012
74 of 145