adsp-21266skstz-2b Analog Devices, Inc., adsp-21266skstz-2b Datasheet - Page 25

• Manufacturer Part Number: adsp-21266skstz-2b
• Description: Sharc Embedded Processor
• Manufacturer: Analog Devices, Inc.

Precision Clock Generator (Direct Pin Routing)
The timing in
SRU is configured such that the precision clock generator
(PCG) takes its inputs directly from the DAI pins (via pin buff­
ers) and sends its outputs directly to the DAI pins. For the other
Table 23. Precision Clock Generator (Direct Pin Routing)
Parameter
Timing Requirements
t
t
t
Switching Characteristics
t
t
t
PCGIW
STRIG
HTRIG
DPCGIO
DTRIG
PCGOW
Table 23
Input Clock Pulse Width
PCG Trigger Setup Before Falling Edge of PCG Input Clock
PCG Trigger Hold After Falling Edge of PCG Input Clock
PCG Output Clock and Frame Sync Active Edge Delay After PCG Input
Clock Falling Edge
PCG Output Clock and Frame Sync Delay After PCG Trigger
Output Clock Pulse Width
PCG_CLKx_O
PCG_TRIGx_I
and
PCG_EXTx_I
PCG_FSx_O
Figure 15
DAI_Pm
(CLKIN)
DAI_Pn
DAI_Py
DAI_Pz
is valid only when the
Figure 15. Precision Clock Generator (Direct Pin Routing)
t
STRIG
Rev. E | Page 25 of 48 | July 2008
t
HTRIG
t
DTRIG
t
DPCGIO
cases where the PCG’s inputs and outputs are not directly
routed to/from DAI pins (via pin buffers), there is no timing
data available. All timing parameters and switching characteris­
tics apply to external DAI pins (DAI_P07–DAI_P20).
ADSP-21261/ADSP-21262/ADSP-21266
t
PCGIW
Min
20
2
2
2.5
2.5 + 2.5 × t
40
t
PCGOW
PCGOW
Max
10
10 + 2.5 × t
PCGOW
Unit
ns
ns
ns
ns
ns
ns