Serial Ports
To determine whether communication is possible between two
devices at clock speed n, the following specifications must be
confirmed: 1) frame sync delay and frame sync setup and hold,
2) data delay and data setup and hold, and 3) serial clock
(SCLK) width.
Table 27. Serial Ports—External Clock
Serial port signals are routed to the DAI_P20–1 pins using the
SRU. Therefore, the timing specifications provided below are
valid at the DAI_P20–1 pins.
1.0 V, 200 MHz
1.2 V, 266 MHz
Parameter
Min
Max
Min
Max
Unit
Timing Requirements
t SFSE 1
Frame Sync Setup Before SCLK
(Externally Generated Frame Sync in either Transmit
2.8
2.5
ns
or Receive Mode)
t HFSE 1
Frame Sync Hold After SCLK
(Externally Generated Frame Sync in either Transmit
2.5
2.5
ns
or Receive Mode)
t SDRE 1
t HDRE 1
t SCLKW
t SCLK
Receive Data Setup Before Receive SCLK
Receive Data Hold After SCLK
SCLK Width
SCLK Period
3.1
2.5
(t PCLK × 4) ÷ 2 – 1.5
t PCLK × 4
2.5
2.5
(t PCLK × 4) ÷ 2 – 1.5
t PCLK × 4
ns
ns
ns
ns
Switching Characteristics
t DFSE 2
Frame Sync Delay After SCLK (Internally Generated
t HOFSE
2
Frame Sync in either Transmit or Receive Mode)
Frame Sync Hold After SCLK (Internally Generated
Frame Sync in either Transmit or Receive Mode)
2
13.5
2
10.5
ns
ns
t DDTE 2
t HDTE 2
Transmit Data Delay After Transmit SCLK
Transmit Data Hold After Transmit SCLK
2
13.9
2
11
ns
ns
1
2
Referenced to sample edge.
Referenced to drive edge.
Rev. D | Page 33 of 56 | April 2013
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ADZS-21469-EZLITE KIT EVAL EZ LITE ADSP-21469
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