LAN9250 datasheet(138/421 Pages) MICROCHIP

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LAN9250

DS00001913A-page 138

 2015 Microchip Technology Inc.

10.4

SPI/SQI Timing Requirements

Note 3:

The Read instruction is limited to 30 MHz maximum

Note 4:

Depends on loading of 30 pF or 10 pF

Note 5:

Depending on the clock frequency and pulse width, data may not be valid until following the next rising edge

of SCK. The host SPI controller may need to delay the sampling of the data by either a fixed time or by using

the falling edge of SCK.

FIGURE 10-17:

SPI/SQI INPUT TIMING

FIGURE 10-18:

SPI/SQI OUTPUT TIMING

TABLE 10-3:

SPI/SQI TIMING VALUES

Symbol

Description

Min

Typ

Max

Units

fsck

SCK clock frequency Note 3

30 / 80

MHz

thigh

SCK high time

5.5

tlow

SCK low time

5.5

tscss

SCS# setup time to SCK

5ns

tscsh

SCS# hold time from SCK

5ns

tscshl

SCS# inactive time

tsu

Data input setup time to SCK

3ns

thd

Data input hold time from SCK

4ns

ton

Data output turn on time from SCK

0ns

Data output valid time from SCK Note 4, Note 5

11.0/9.0

tho

Data output hold time from SCK

0ns

tdis

Data output disable time from SCS# inactive

SCK

SI/SIO[3:0]

SCS#

tscss

thigh

tlow

tsu

thd

tscshl

tscsh

SO/SIO[3:0]

SCK

thigh

tlow

SCS#

tdis

ton

tho

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