Altera Serial Digital Interface (SDI) MegaCore Function User Manual
Page 97
Chapter 4: SDI Audio IP Cores
4–9
SDI Audio Embed MegaCore Function
February 2013
Altera Corporation
Serial Digital Interface (SDI) MegaCore Function
User Guide
Video Status Register
7:0
Active channels
RO
Reports the detected video input standard.
Bits[7:5] = Picture structure code.
Defined values for picture structure code are:
001b
= 486 or 576 line SD-SDI
100b
= 720 line HD-SDI
101b
= 1080 line HD-SDI
010b
= 1080 line 3G-SDI
Bit[4] = 0b—Interlace or segmented frame, 1b—Progressive.
Bits[3:0] = Frame rate code.
Defined values for frame rate code (in Hz) are:
0010b
= 23.97
0011b
= 24
0101b
= 25
0110b
= 29.97
0111b
= 30
1001b
= 50
1010b
= 59.94
1011b
= 60
Audio Status Register
7:0
Unused
—
Reserved for future use.
Channel Status Control Registers
7:0
CS mode select
RW
When set to 00b, the core keeps the existing channel status data.
When set to 01b, the core replaces the channel status data with
default values.
When set to 10b, the core replaces the data with the contents of the
appropriate channel status RAM.
The following bits correspond to the number of audio groups you
specify:
■
Bit [1:0] = Audio group 1
■
Bit [3:2] = Audio group 2
■
Bit [5:4] = Audio group 3
■
Bit [7:6] = Audio group 4
Sine Channel n Frequency
7:0
Sine channel frequency
RW
Defines the frequency of the generated audio.
Channel Status RAM
7:0
Channel status data
WO
Write accesses within the address range 10h to 3Fh to the channel
status RAM. This field returns the 24 bytes of channel status for X
channels starting at address 10h to 27h, and the 24 bytes of channel
status for Y channels starting at address 28h to 3Fh.
Table 4–9. SDI Audio Embed MegaCore Function Register Map
Bit
Name
Access
Description