L64105 LSI Logic Corporation, L64105 Datasheet - Page 261

• Manufacturer Part Number: L64105
• Description: Mpeg-2 Audio/video Decoder
• Manufacturer: LSI Logic Corporation

8.2.14 Auxiliary Data FIFO Operation
The Auxiliary Data FIFO is used to store certain header parameters
required by the system controller or host. The FIFO operates as a
128-byte-deep circular buffer. The various registers associated with the
Auxiliary Data FIFO are listed in
following. More complete descriptions can be found at the page
references shown in the table.
Table 8.12
When the Postparser writes the first byte of auxiliary data into the Aux
Data FIFO, the Aux/User Data FIFO Ready Interrupt is set. When the
Postparser detects the First Slice Start Code in the bitstream, it sets the
First Slice Start Code Detect Interrupt bit. When set and not masked,
either bit causes INTRn to be asserted to the host. The host should
respond by reading Registers 0 through 4 to determine the cause of the
interrupt.
If the host detects that the AUX/User Data FIFO Interrupt is set, it should
read the Aux Data FIFO Status bits and the User Data FIFO Status bits
to determine which FIFO to read. The status code meanings are shown
in
Postparser Operation
Register Bit(s) R/W Name
Table
64
67
0
0
8.13.
[1:0]
[4:2]
[7:0]
1
2
0
Aux Data FIFO Registers
W
W
W
R
R
R
R
R
Aux/User Data FIFO Ready Interrupt
Aux/User Data FIFO Ready Interrupt Mask
First Slice Start Code Detect Interrupt
First Slice Start Code Detect Interrupt Mask
Reset Aux Data FIFO
Aux Data FIFO Status [1:0]
Aux Data Layer ID [2:0]
Aux Data FIFO Output [7:0]
Table 8.12
and described in the text
Page
4-17
4-17
4-18
4-19
Ref.
4-2
4-3
8-19