DM368ZCEZ datasheet(59/208 Pages) TI1

59 / 208 page

Pre-DIV

(Programmable)

PLL

PLLEN

PLLM

(Programmable)

Post-DIV*

OSCIN

PLLDIV1*

SYSCLK1

(USBReferenceClock)

PLLDIV2*

SYSCLK2(ARM926EJ-S,

HDVICP BlockClock)

PLLDIV3*

SYSCLK3(DDR2xClock)

PLLDIV4*

SYSCLK4

(VoiceCodecClock)

PLLDIV5*

SYSCLK5(VENCClock)

OSCDIV1*

OBSCLK

(CLKOUT1)

* – Programmable

TMS320DM368

www.ti.com

SPRS668C

– APRIL 2010 – REVISED JUNE 2011

Figure 3-4. PLLC2 Configuration

3.3.5

Processing, Video, EDMA and DDR EMIF Subsystems Maximum Operating

Frequencies

Table 3-4 shows the maximum speeds supported for each of the major blocks supported on the different

speed grade devices.

Table 3-4. Processing, Video, EDMA and DDR EMIF Subsystems Maximum Operating Frequencies

DM368

ARM926 RISC

432 MHz

Co-Processor (HDVICP)

340 MHz

Co-Processor (MJCP)

340 MHz

DDR2

340 MHz

mDDR

168 MHz

VPSS Logic Block

340 MHz

Peripheral System Bus and EDMA

170 MHz

VPBE-VENC

74.25 MHz

VPFE

120 MHz

3.3.6

PLL Controller Clocking Configurations Examples

Like the DM365, the DM368 uses two PLLs to generate the two fundamental clocks used on the device.

These two clocks feed two divider blocks which generate all of the functional clocks used by the

peripherals and cores in the DM368. The ARM926 and DDR peripheral in the DM368 are limited to a

maximum clock frequency of 432 MHz and 340 MHz respectively. There are some peripheral clocks on

the DM368 which are required to operate at a specific frequency by functional specification or convention.

These frequencies are detailed in Table 3-5.

Table 3-5. Specific Peripheral Operating Frequencies

Clock

Required Frequency (MHz)

Reason

VENC (standard definition)

required to generate a valid NTSC signal

VENC (high definition)

74.25

required to generate a valid ATSC signal

USB

36, 24, or 19.2

required by the USB peripheral to generate a 48 MHz USB clock

Voice Codec

4.096

required to generate a precise 16 kHz audio sample rate

Device Configurations

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Product Folder Link(s): TMS320DM368

DM368ZCEZ Datasheet(PDF) 59 Page - Texas Instruments

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