TMS320C6454

Fixed-Point Digital Signal Processor

www.ti.com

SPRS311A –APRIL 2006 –REVISED DECEMBER 2006

7.7.4PLL1 Controller Input and Output Clock Electrical Data/Timing

Table 7-29. Timing Requirements for CLKIN1 Devices(1) (2) (3) (see Figure 7-21)

 

 

 

-720

 

 

 

 

 

-850

 

 

 

 

 

-1000

 

 

NO.

 

 

PLL MODES

 

UNIT

 

 

 

x1 (Bypass), x15,

 

 

 

 

x20, x25, x30, x32

 

 

 

 

MIN

MAX

 

1

t

Cycle time, CLKIN1(4)

15

30.3

ns

 

c(CLKIN1)

 

 

 

 

2

tw(CLKIN1H)

Pulse duration, CLKIN1 high

0.4C

 

ns

3

tw(CLKIN1L)

Pulse duration, CLKIN1 low

0.4C

 

ns

4

tt(CLKIN1)

Transition time, CLKIN1

 

1.2

ns

5

tJ(CLKIN1)

Period jitter (peak-to-peak), CLKIN1

 

100

ps

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

(2)For more details on the PLL multiplier factors (x1 [BYPASS], x 15, x20, x25, x30, x32), see Section 7.7.1.2, PLL1 Controller Operating Modes.

(3)C = CLKIN1 cycle time in ns. For example, when CLKIN1 frequency is 50 MHz, use C = 20 ns.

(4)The PLL1 multiplier factors (x1 [BYPASS], x 15, x20, x25, x30, x32) further limit the MIN and MAX values for tc(CLKIN1). For more detailed information on these limitations, see Section 7.7.1.1, Internal Clocks and Maximum Operating Frequencies.

5

1

4

2

CLKIN1

3

4

Figure 7-21. CLKIN1 Timing

Table 7-30. Switching Characteristics Over Recommended Operating Conditions for SYSCLK4

[CPU/8 - CPU/12](1) (2) (see Figure 7-22)

 

 

 

-720

 

 

NO.

 

PARAMETER

-850

 

UNIT

 

-1000

 

 

 

 

 

 

 

 

 

MIN

MAX

 

2

tw(CKO3H)

Pulse duration, SYSCLK4 high

4P – 0.7

6P + 0.7

ns

3

tw(CKO3L)

Pulse duration, SYSCLK4 low

4P – 0.7

6P + 0.7

ns

4

tt(CKO3)

Transition time, SYSCLK4

 

1

ns

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

(2)P = 1/CPU clock frequency in nanoseconds (ns)

4

2

SYSCLK4

3

4

Figure 7-22. SYSCLK4 Timing

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Texas Instruments TMS320C6454 warranty Timing Requirements for CLKIN1 Devices1 2 3 see Figure, 720 850 1000, PLL Modes Unit