GS2971A Datasheet, PDF (78/152 Pages) Gennum Corporation – Integrated audio clock generator

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
0
Bank B
800h
1023
BFFh
1023
BFFh
ANC_DATA_SWITCH = HIGH
Figure 4-33: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 4-34: Ancillary Data
Extraction - Step C).
Bank A
0
Application Layer
800hRead ^Pointer
0
Internal Write
Pointer
Bank B
ANC DATA
ANC DATA
ANC DATA
ANC DATA
ANC DATA
ANC DATA
ANC DATA
800h
1023
BFFh
1023
BFFh
ANC_DATA_SWITCH = LOW
Figure 4-34:Ancillary Data Extraction - Step C
GS2971A 3Gb/s, HD, SD SDI Receiver
Data Sheet
54311 - 2
September 2012
78 of 152