Cirrus Logic CS4970x4 - Manual (Page 14)

CS4970x4 Data Sheet
32-bit High Definition Audio Decoder DSP Family
DS752F1 14
5.10 Switching Characteristics — Serial Control Port - SPI Master Mode
.
Figure 4. Serial Control Port - SPI Master Mode Timing
Parameter Symbol Min Typical Max Units
SCP_CLK frequency
1, 2
1. The specification f
spisck
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.
2. See Section 5.7.
3. SCP_CLK PERIOD refers to the period of SCP_CLK as being used in a given application. It does not refer to a tested parameter.
f
spisck
— — F
xtal
/2 MHz
SCP_CS falling to SCP_CLK rising
3
t
spicss
— 11*DCLKP +
(SCP_CLK PERIOD)/2
— ns
SCP_CLK low time t
spickl
16.9 — — ns
SCP_CLK high time t
spickh
16.9 — — ns
Setup time SCP_MISO input t
spidsu
11 — — ns
Hold time SCP_MISO input t
spidh
5 — — ns
SCP_CLK low to SCP_MOSI output valid t
spidov
— — 11 ns
SCP_CLK low to SCP_CS falling t
spicsl
7 — — ns
SCP_CLK low to SCP_CS rising t
spicsh
— 11*DCLKP +
(SCP_CLK PERIOD)/2
— ns
Bus free time between active SCP_CS t
spicsx
— 3*DCLKP — ns
SCP_CLK falling to SCP_MOSI output high-Z t
spidz
— — 20 ns
EE_CS#
SCP_CLK
SCP_MISO
SCP_MOSI
0 1 2 6 7 0 5 6 7
t
spicss
t
spickl
t
spickh
t
spidsu
t
spidh t
spidov
A6 A5 A0 R/W MSB LSB
MSB LSB
t
spicsh
t
spicsx
f
spisck
t
spidz
t
spicsl