SM320C6455-EP

FIXED-POINT DIGITAL SIGNAL PROCESSOR

www.ti.com

SPRS462B – SEPTEMBER 2007 – REVISED JANUARY 2008

7.8.4PLL2 Controller Input Clock Electrical Data/Timing

Table 7-39. Timing Requirements for CLKIN2(1)(2)(3) (see Figure 7-30)

 

 

 

-720

 

 

 

 

 

-850

 

 

NO.

 

 

A-1000/-1000

UNIT

 

 

 

-1200

 

 

 

 

 

MIN

MAX

 

1

tc(CLKIN2)

Cycle time, CLKIN2

37.5

80

ns

2

tw(CLKIN2H)

Pulse duration, CLKIN2 high

0.4C

 

ns

3

tw(CLKIN2L)

Pulse duration, CLKIN2 low

0.4C

 

ns

4

tt(CLKIN2)

Transition time, CLKIN2

 

1.2

ns

5

tJ(CLKIN2)

Period jitter (peak-to-peak), CLKIN2

 

100

ps

(1)The reference points for the rise and fall transitions are measured at 3.3 V VIL MAX and VIH MIN.

(2)C = CLKIN2 cycle time in ns. For example, when CLKIN2 frequency is 25 MHz, use C = 40 ns.

(3)If EMAC is enabled with RGMII or GMII, CLKIN2 cycle time must be 40 ns (25 MHz).

5

1

4

2

CLKIN2

3

4

Figure 7-30. CLKIN2 Timing

Submit Documentation Feedback

C64x+ Peripheral Information and Electrical Specifications

159

Page 159
Image 159
Texas Instruments SM320C6455-EP manual 4 PLL2 Controller Input Clock Electrical Data/Timing