CS485xx Family Data Sheet

32-bit Audio Decoder DSP Family

14

Copyright 2009 Cirrus Logic, Inc.

DS734F3

CONFIDENTIAL

Figure 3. Serial Control Port - SPI Slave Mode Timing

5.10 Switching Characteristics — Serial Control Port - SPI Master Mode

Parameter

Symbol

Min

Typical

Max

Units

maximum speed of the communication port may be limited by the firmware application.

2

2. See Section 5.7.

MHz

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

-

11*DCLKP +

(SCP_CLK PERIOD)/2

-ns

SCP_CLK low time

20

-

ns

SCP_CLK high time

20

-

ns

Setup time SCP_MISO input

9-

ns

Hold time SCP_MISO input

5-

ns

SCP_CLK low to SCP_MOSI output valid

-8

ns

SCP_CLK low to SCP_CS# falling

7-

ns

SCP_CLK low to SCP_CS# rising

-

11*DCLKP +

(SCP_CLK PERIOD)/2

-ns

Bus free time between active SCP_CS#

3*DCLKP

-

ns

SCP_CLK falling to SCP_MOSI output high-Z

-20

ns

SCP_BSY#

SCP_CS#

SCP_CLK

SCP_MOSI

SCP_MISO

SCP_IRQ#

0

1

2670

56

7

A6

A5

A0

R/W

MSB

LSB

MSB

LSB