Altera Serial Digital Interface (SDI) MegaCore Function - Manual (Page 103)

Chapter 4: SDI Audio IP Cores 4–15
SDI Audio Extract MegaCore Function
February 2013 Altera Corporation Serial Digital Interface (SDI) MegaCore Function
User Guide
Register Maps
Table 4–16 and Table 4–17 list the register maps for SDI Audio Extract MegaCore
function.
Table 4–16. SDI Audio Extract MegaCore Function Register Map
Bytes Offset Name
00h Audio Control Register
01h Audio Presence Register
02h Audio Status Register
03h Reserved
04h Error Status Register
05h Reserved
06h FIFO Status Register
07h Clock Status Register
08h–09h Reserved
10h–3Fh Channel Status RAM (0×00), (0×01), ... (0×2F)
Table 4–17. SDI Audio Extract MegaCore Function Register Map (Part 1 of 2)
Bit Name Access Description
Audio Control Register
0 Enable RW Enables the audio extraction component and internal AES output.
3:1 Extract pair RW
Defines the audio pair that the component extracts. For example:
■ [000] = Extract the first channel pair of audio signal
■ [111] = Extract the eighth channel pair of audio signal
4 Extract pair MSB RW
For 3G-SDI Level A standard, this field extends the extract pair field to
allow for future implementations with 32 embedded audio channels.
For 3G-SDI Level B standard, this field selects the active video half of
the 3G multiplex.
5 Mute RW Drive this register high to mute the audio output.
7:6 Unused — Reserved for future use.
Audio Presence Register
3:0 Data packet present
RO Reports which audio data groups are detected in the SDI stream.
The following bits correspond to the number of audio groups
detected:
■ Bit [0] = Audio group 1
■ Bit [1] = Audio group 2
■ Bit [2] = Audio group 3
■ Bit [3] = Audio group 4
7:4 Control packet present RO Reports which audio control packets are detected in the SDI stream.
Audio Status Register
3:0 Active channels RW
Reflects the lower four bits of the ACT (active) field of the audio
control packet.