L64105 LSI Logic Corporation, L64105 Datasheet - Page 341

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

10.3.5 Autostart
The selected audio decoder and the formatter can be autostarted at a
specified System Reference Clock (SCR) count. The registers
associated with autostart are listed in
Table 10.2
The host should use the following sequence for autostart:
1. Clear the Audio Decoder and Audio Formatter Start/Stop bits.
2. Change the Audio Decoder and Audio Formatter Play Mode to
3. Program the SCR Compare/Capture Mode bits to compare.
4. Write the SCR value on which to start into the SCR Compare Audio
5. Set the Audio Start on Compare bit.
6. Set the Audio Decoder and Audio Formatter Start/Stop bits.
When the SCR counter value equals that written into the SCR Compare
Audio registers, an autostart pulse is generated to change the Play Mode
of the decoder and formatter to normal play. The SCR Compare Audio
Interrupt bit is set and INTRn is asserted to the host if the interrupt is not
masked. Also, the SCR Compare/Capture Mode bits are reset to no
compare or capture and the Audio Start on Compare bit is cleared.
Decoding Flow Control
Name
SCR Compare/Capture Mode
SCR Compare Audio
Audio Start on Compare
SCR Compare Audio Interrupt
pause.
registers.
Audio Autostart Registers
Register/Bits
17 bits 0 and 1
20 through 23
19 bit 0
1 bit 2
Table
10.2.
Page Ref.
4-14
4-16
4-15
4-4
10-9