The Audio Tracking Logic (ATL) module, which is
used by HD Radio™ applications to
synchronize the digital audio output to the baseband clock, supports the following
main features:
- Contains four ATL instances,
for HD Radio support and asynchronous sample rate conversion assistance
- Each instance tracks the time
error between two syncs (local Audio Word Select [AWS] and Baseband Word
Select [BWS])
- Each instance selects between
8 mux choices for BWS and 8 mux choices for AWS
- Each instance generates
modulated ATCLK clock signals with software-initiated pulse stealing
- Selection between interface
or functional clock to run error counting timers and to derive modulated
clock outputs
- Clock and reset management:
receives clock and reset signals from the device PSC module
- Hardware reset
- Local software reset