Datasheet

Rev. C | Page 46 of 76 | July 2013
ADSP-21477/ADSP-21478/ADSP-21479
The SPORTx_TDV_O output signal (routing unit) becomes
active in SPORT multichannel/packed mode. During transmit
slots (enabled with active channel selection registers), the
SPORTx_TDV_O is asserted for communication with external
devices.
Table 38. Serial Ports—TDV (Transmit Data Valid)
88-Lead LFCSP Package All Other Packages
Unit
Parameter Min Max Min Max
Switching Characteristics
1
t
DRDVEN
TDV Assertion Delay from Drive Edge of External Clock 3 3 ns
t
DFDVEN
TDV Deassertion Delay from Drive Edge of External Clock 2 × t
PCLK
13.25 ns
t
DRDVIN
TDV Assertion Delay from Drive Edge of Internal Clock –0.1 –0.1 ns
t
DFDVIN
TDV Deassertion Delay from Drive Edge of Internal Clock 3.5 3.5 ns
1
Referenced to drive edge.
Figure 25. Serial Ports—TDV Internal and External Clock
DRIVE EDGE DRIVE EDGE
DAI_P20–1
(SCLK, EXT)
t
DRDVEN
t
DFDVEN
DRIVE EDGE DRIVE EDGE
DAI_P20–1
(SCLK, INT)
t
DRDVIN
t
DFDVIN
TDVx
DAI_P20-1
TDVx
DAI_P20-1