Motorola TMS320C6711D Manual de usuario descargar pdf (Pagina 68)

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SPRS292A − OCTOBER 2005 − REVISED NOVEMBER 2005

POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443

INPUT AND OUTPUT CLOCKS

timing requirements for CLKIN

†‡§

(see Figure 22)

GDPA-167, ZDPA−167 –200

PLL MODE

(PLLEN = 1)

BYPASS MODE

(PLLEN = 0)

PLL MODE

(PLLEN = 1)

BYPASS MODE

(PLLEN = 0)

UNIT

MIN MAX MIN MAX MIN MAX MIN MAX

1 t

c(CLKIN)

Cycle time, CLKIN 6 83.3 6.7 5 83.3 6.7 ns

2 t

w(CLKINH)

Pulse duration, CLKIN high 0.4C 0.4C 0.4C 0.4C ns

3 t

w(CLKINL)

Pulse duration, CLKIN low 0.4C 0.4C 0.4C 0.4C ns

4 t

t(CLKIN)

Transition time, CLKIN 5 5 5 5 ns

†

The reference points for the rise and fall transitions are measured at V

MAX and V

MIN.

‡

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

See the PLL and PLL controller section of this data sheet.

timing requirements for CLKIN

†‡§

(see Figure 22)

–250

PLL MODE

(PLLEN = 1)

BYPASS MODE

(PLLEN = 0)

UNIT

MIN MAX MIN MAX

1 t

c(CLKIN)

Cycle time, CLKIN 4 83.3 6.7 ns

2 t

w(CLKINH)

Pulse duration, CLKIN high 0.4C 0.4C ns

3 t

w(CLKINL)

Pulse duration, CLKIN low 0.4C 0.4C ns

4 t

t(CLKIN)

Transition time, CLKIN 5 5 ns

†

The reference points for the rise and fall transitions are measured at V

MAX and V

MIN.

‡

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

See the PLL and PLL controller section of this data sheet.

CLKIN

Figure 22. CLKIN Timings

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 106 107

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