Motorola TMS320C6711D Manuale Utente
SPRS292A − OCTOBER 2005 − REVISED NOVEMBER 2005
70
POST OFFICE BOX 1443
•
HOUSTON, TEXAS 77251−1443
INPUT AND OUTPUT CLOCKS (CONTINUED)
timing requirements for ECLKIN
†
(see Figure 25)
NO.
GDPA-167
ZDPA−167
ZDPA−167
−200
−250
−250
UNIT
MIN
MAX
1
tc(EKI)
Cycle time, ECLKIN
10
ns
2
tw(EKIH) Pulse duration, ECLKIN high
4.5
ns
3
tw(EKIL)
Pulse duration, ECLKIN low
4.5
ns
4
tt(EKI)
Transition time, ECLKIN
3
ns
† The reference points for the rise and fall transitions are measured at VIL MAX and VIH MIN.
ECLKIN
1
2
3
4
4
Figure 25. ECLKIN Timings
switching characteristics over recommended operating conditions for ECLKOUT
द
(see Figure 26)
NO.
PARAMETER
GDPA-167
ZDPA−167
ZDPA−167
−200
−250
−250
UNIT
MIN
MAX
1
tc(EKO)
Cycle time, ECLKOUT
E − 0.9
E + 0.9
ns
2
tw(EKOH)
Pulse duration, ECLKOUT high
EH − 0.9
EH + 0.9
ns
3
tw(EKOL)
Pulse duration, ECLKOUT low
EL − 0.9
EL + 0.9
ns
4
tt(EKO)
Transition time, ECLKOUT
2
ns
5
td(EKIH-EKOH) Delay time, ECLKIN high to ECLKOUT high
1
6.5
ns
6
td(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 VOL MAX and VOH 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.
¶ EH is the high period of ECLKIN in ns and EL is the low period of ECLKIN in ns.
5
6
1
2
3
ECLKIN
ECLKIN
ECLKOUT
4
4
Figure 26. ECLKOUT Timings