Texas-instruments Digital Signal Processor SM320F2812-HT Manual do Utilizador descarregar pdf (Página 93)

SM320F2812-HT

www.ti.com

SGUS062B– JUNE 2009– REVISED JUNE 2011

6.12 Device Clock Table

This section provides the timing requirements and switching characteristics for the various clock options

available on the F2812 DSP. Table 6-3 lists the cycle times of various clocks.

Table 6-3. Clock Table and Nomenclature

MIN NOM MAX UNIT

c(OSC)

, Cycle time 28.6 50 ns

On-chip oscillator clock

Frequency 20 35 MHz

c(CI)

, Cycle time 6.67 250 ns

XCLKIN

Frequency 4 150 MHz

c(SCO)

, Cycle time 6.67 500 ns

SYSCLKOUT

Frequency 2 150 MHz

c(XCO)

, Cycle time 6.67 2000 ns

XCLKOUT

Frequency 0.5 150 MHz

c(HCO)

, Cycle time 6.67 13.3

(1)

HSPCLK

Frequency 75

(1)

150 MHz

c(LCO)

, Cycle time 13.3 26.6

(1)

LSPCLK

Frequency 37.5

(1)

75 MHz

c(ADCCLK)

, Cycle time

(2)

40 ns

ADC clock

Frequency 25 MHz

c(SPC)

, Cycle time 50 ns

SPI clock

Frequency 20 MHz

c(CKG)

, Cycle time 50 ns

McBSP

Frequency 20 MHz

c(XTIM)

, Cycle time 6.67 ns

XTIMCLK

Frequency 150 MHz

(1) This is the default reset value if SYSCLKOUT = 150 MHz.

(2) The maximum value for ADCCLK frequency is 25 MHz. For SYSCLKOUT values of 25 MHz or lower, ADCCLK has to be

SYSCLKOUT/2 or lower. ADCCLK = SYSCLKOUT is not a valid mode for any value of SYSCLKOUT.

6.13 Clock Requirements and Characteristics

6.13.1 Input Clock Requirements

The clock provided at the XCLKIN pin generates the internal CPU clock cycle.

Table 6-4. Input Clock Frequency

(1)

PARAMETER MIN TYP MAX UNIT

Resonator

(2)

20 35

Input clock frequency Crystal

(2)

20 35 MHz

XCLKIN 4 150

Limp mode clock frequency 2 MHz

(1) Not production tested.

(2) Not guaranteed for T

> 125°C.

Submit Documentation Feedback

Product Folder Link(s): SM320F2812-HT

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 152 153

Comentários a estes Manuais

Sem comentários

Texas-instruments Digital Signal Processor SM320F2812-HT Manual do Utilizador Página 93

Comentários a estes Manuais

Manuais e produtos relacionados com Hardware Texas-instruments Digital Signal Processor SM320F2812-HT