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CS497014 Datasheet(PDF) 13 Page - Cirrus Logic

Part No. CS497014
Description  High Definition Audio Decoder DSP Family with Dual 32-bit Engine Technology
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Maker  CIRRUS [Cirrus Logic]
Homepage  http://www.cirrus.com
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CS497014 Datasheet(HTML) 13 Page - Cirrus Logic

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CS4970x4 Data Sheet
32-bit High Definition Audio Decoder DSP Family
DS752F1
13
5.9 Switching Characteristics — Serial Control Port - SPI Slave Mode
Figure 3. Serial Control Port - SPI Slave Mode Timing
Parameter
Symbol
Min
Typical
Max
Units
SCP_CLK frequency1,2
1. The specification fspisck indicates the maximum speed of the hardware. The system designer should be aware that the actual
maximum speed of the communication port may be limited by the firmware application. Flow control using the SCP_
BSY pin
should be implemented to prevent overflow of the input data buffer. At boot the maximum speed is Fxtal/3.
2. When SCP1 is in SPI slave mode, very slow rise and fall times of the SCP_CLK edges may make the edges of the SCP_CLK
more susceptible to noise, resulting in non-smooth edges. Any glitch at the threshold levels of the SCP port input signals could
result in abnormal operation of the port. In systems that have noise coupling onto SCP_CLK, slow rise and fall times may cause
host communication problems. Increasing rise time makes host communication more reliable.
fspisck
——
25
MHz
SCP_CS falling to SCP_CLK rising2
tspicss
24
ns
SCP_CLK low time2
tspickl
20
ns
SCP_CLK high time2
tspickh
20
ns
Setup time SCP_MOSI input
tspidsu
5—
ns
Hold time SCP_MOSI input
tspidh
5—
ns
SCP_CLK low to SCP_MISO output valid2
tspidov
——
11
ns
SCP_CLK falling to SCP_IRQ rising2
tspiirqh
20
ns
SCP_CS rising to SCP_IRQ falling2
tspiirql
0—
ns
SCP_CLK low to SCP_CS rising2
tspicsh
24
ns
SCP_CS rising to SCP_MISO output high-Z
tspicsdz
—20
ns
SCP_CLK rising to SCP_BSY falling2
tspicbsyl
—3*DCLKP+20
ns
SCP_BSY#
SCP_CS#
SCP_CLK
SCP_MOSI
SCP_MISO
SCP_IRQ#
0
12670
56
7
tspicss
tspickl
tspickh
tspidsu
tspidh
tspidov
A6
A5
A0
R/W
MSB
LSB
MSB
LSB
tspicsh
tspibsyl
tspiirql
tspiirqh
fspisck
tspicsdz


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