TMS320C6414T, TMS320C6415T, TMS320C6416T
FIXEDPOINT DIGITAL SIGNAL PROCESSORS
SPRS226M NOVEMBER 2003 REVISED APRIL 2009
83
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
INPUT AND OUTPUT CLOCKS (CONTINUED)
timing requirements for ECLKIN for EMIFA and EMIFB§ (see Figure 19)
NO.
600
720
850
1G
UNIT
MIN
MAX
1
tc(EKI)
Cycle time, ECLKIN
CVDD = 1.2 V
6#
16P
ns
1
tc(EKI)
Cycle time, ECLKIN
CVDD = 1.1 V
7.5#
16P
ns
2
tw(EKIH)
Pulse duration, ECLKIN high
2.7
ns
3
tw(EKIL)
Pulse duration, ECLKIN low
2.7
ns
4
tt(EKI)
Transition time, ECLKIN
2
ns
5
tJ(EKI)
Period jitter, ECLKIN
0.02E
ns
P = 1/CPU clock frequency in ns. For example, when running parts at 720 MHz, use P = 1.39 ns.
The reference points for the rise and fall transitions are measured at VIL MAX and VIH MIN.
§ These C64x devices have two EMIFs (64-bit EMIFA and 16-bit EMIFB). All EMIFA signals are prefixed by an “A” and all EMIFB signals are
prefixed by a “B”. Throughout the rest of this document, in generic EMIF areas of discussion, the prefix “A” or “B” may be omitted.
E = the EMIF input clock (ECLKIN, CPU/4 clock, or CPU/6 clock) period in ns for EMIFA or EMIFB.
# Minimum ECLKIN cycle times must be met, even when ECLKIN is generated by an internal clock source. Minimum ECLKIN times are based
on internal logic speed; the maximum useable speed of the EMIF may be lower due to AC timing requirements. On the devices, 133-MHz
operation is achievable if the requirements of the EMIF Device Speed section are met.
ECLKIN
2
3
4
5
1
Figure 19. ECLKIN Timing for EMIFA and EMIFB
switching characteristics over recommended operating conditions for ECLKOUT1 for EMIFA and
EMIFB modules§||k (see Figure 20)
NO.
PARAMETER
600
720
850
1G
UNIT
MIN
MAX
1
tJ(EKO1)
Period jitter, ECLKOUT1
0
±175h
ps
2
tw(EKO1H)
Pulse duration, ECLKOUT1 high
EH 0.7
EH + 0.7
ns
3
tw(EKO1L)
Pulse duration, ECLKOUT1 low
EL 0.7
EL + 0.7
ns
4
tt(EKO1)
Transition time, ECLKOUT1
1
ns
5
td(EKIH-EKO1H)
Delay time, ECLKIN high to ECLKOUT1 high
0.8
8
ns
6
td(EKIL-EKO1L)
Delay time, ECLKIN low to ECLKOUT1 low
0.8
8
ns
§ These C64x devices have two EMIFs (64-bit EMIFA and 16-bit EMIFB). All EMIFA signals are prefixed by an “A” and all EMIFB signals are
prefixed by a “B”. Throughout the rest of this document, in generic EMIF areas of discussion, the prefix “A” or “B” may be omitted.
E = the EMIF input clock (ECLKIN, CPU/4 clock, or CPU/6 clock) period in ns for EMIFA or EMIFB.
|| The reference points for the rise and fall transitions are measured at VOL MAX and VOH MIN.
kEH is the high period of E (EMIF input clock period) in ns and EL is the low period of E (EMIF input clock period) in ns for EMIFA or EMIFB.
hThis cycle-to-cycle jitter specification was measured with CPU/4 or CPU/6 as the source of the EMIF input clock.