SPEAR1340 datasheet(180/200 Pages) STMICROELECTRONICS

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Timing characteristics

SPEAr1340

180/200

Doc ID 023063 Rev 4

5.13

PWM timing characteristics

This section describes the timing characteristics of the four PWM generators.

The timing characterization is performed assuming an output load capacitance of 2 to 10 pF

on the four outputs.

5.14

SMI timing characteristics

This section describes the timing characteristics of the serial NOR Flash controller.

The timing characterization is performed assuming an output load capacitance of 10 pF on

all outputs, an input transition of 2ns on all the inputs and using PLL1 as source of the clock

for the timing extraction.

Figure 41.

SMI timing waveform

Table 93.

PWM timing characteristics

Symbol

Parameter

Min

Max

Unit

Pulse width (T= programmed pulse width)

T− 2.2

T+ 2.2

Table 94.

SMI timing characteristics

Symbol

Description

Min

Max

Unit

TCLK

SMI_CLK clock period

–

TCLKhigh SMI_CLK output pulse high

T/2 - 1

–

TCLKlow SMI_CLK output pulse low

T/2 - 1

–

SMI_CLK out to SMI_DATAOUT output delay

0.81

9.65

Setup time for SMI_DATAIN data

3.72

–

Hold time for SMI_DATAIN data

-6.46

–

SMI_CLK

(output)

SMI_DATAOUT

TCLKhigh

TCLKlow

SMI_DATAIN

TCSf

SMI_CS0n,SMI_CS1n

TCSr

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