Motorola TMS320C6711D Manuel d'utilisateur télécharger pdf (Page 70)

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SPRS292A − OCTOBER 2005 − REVISED NOVEMBER 2005

POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443

INPUT AND OUTPUT CLOCKS (CONTINUED)

timing requirements for ECLKIN

†

(see Figure 25)

GDPA-167

ZDPA−167

−200

−250

UNIT

MIN MAX

1 t

c(EKI)

Cycle time, ECLKIN 10 ns

2 t

w(EKIH)

Pulse duration, ECLKIN high 4.5 ns

3 t

w(EKIL)

Pulse duration, ECLKIN low 4.5 ns

4 t

t(EKI)

Transition time, ECLKIN 3 ns

†

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

MAX and V

MIN.

ECLKIN

Figure 25. ECLKIN Timings

switching characteristics over recommended operating conditions for ECLKOUT

‡§¶

(see Figure 26)

PARAMETER

GDPA-167

ZDPA−167

−200

−250

UNIT

MIN MAX

1 t

c(EKO)

Cycle time, ECLKOUT E − 0.9 E + 0.9 ns

2 t

w(EKOH)

Pulse duration, ECLKOUT high EH − 0.9 EH + 0.9 ns

3 t

w(EKOL)

Pulse duration, ECLKOUT low EL − 0.9 EL + 0.9 ns

4 t

t(EKO)

Transition time, ECLKOUT 2 ns

5 t

d(EKIH-EKOH)

Delay time, ECLKIN high to ECLKOUT high 1 6.5 ns

6 t

d(EKIL-EKOL)

Delay time, ECLKIN low to ECLKOUT low 1 6.5 ns

‡

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

MAX and V

MIN.

E = ECLKIN period in ns

EH is the high period of ECLKIN in ns and EL is the low period of ECLKIN in ns.

ECLKINECLKIN

ECLKOUT

Figure 26. ECLKOUT Timings

1 2 ... 65 66 67 68 69 70 71 72 73 74 75 ... 106 107

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Motorola TMS320C6711D Manuel d'utilisateur Page 70

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