Texas Instruments TMS320DM355 Manual Do Utilizador
www.ti.com
PRODUCT PREVIEW
5.5.3
Clock PLL Electrical Data/Timing (Input and Output Clocks)
MXI/CLKIN
2
3
4
4
5
1
MXI/CLKIN
2
3
4
4
5
1
TMS320DM355
Digital Media System-on-Chip (DMSoC)
SPRS463A – SEPTEMBER 2007 – REVISED SEPTEMBER 2007
Table 5-5. Timing Requirements for MXI1/CLKIN1
(1) (2)
(see
DM355
NO
UNIT
.
MIN
TYP
MAX
1
t
c(MXI1)
Cycle time, MXI1/CLKIN1
27.7
(3)
41.6
(3)
ns
2
t
w(MXI1H)
Pulse duration, MXI1/CLKIN1 high
0.45C
0.55C
ns
3
t
w(MXI1L)
Pulse duration, MXI1/CLKIN1 low
0.45C
0.55C
ns
4
t
t(MXI1)
Transition time, MXI1/CLKIN1
0.05C
ns
5
t
J(MXI1)
Period jitter, MXI1/CLKIN1
0.02C
ns
(1)
The reference points for the rise and fall transitions are measured at V
IL
MAX and V
IH
MIN.
(2)
C = MXI1/CLKIN1 cycle time in ns. For example, when MXI1/CLKIN1 frequency is 24 MHz use C = 41.6 ns.
(3)
tc(MXI1) = 41.6 ns and tc(MXI1) = 27.7 ns are the only supported cycle times for MXI1/CLKIN1.
Figure 5-7. MXI1/CLKIN1 Timing
Table 5-6. Timing Requirements for MXI2/CLKIN2
(1) (2)
(see
NO.
DM355
UNIT
MIN
TYP
MAX
1
t
c(MXI2)
Cycle time, MXI2/CLKIN2
37.037
(3)
37.037
(3)
ns
2
t
w(MXI2H)
Pulse duration, MXI2/CLKIN2 high
0.45C
0.55C
ns
3
t
w(MXI2L)
Pulse duration, MXI2/CLKIN2 low
0.45C
0.55C
ns
4
t
t(MXI2)
Transition time, MXI2/CLKIN2
0.05C
ns
5
t
J(MXI2)
Period jitter, MXI2/CLKIN2
0.02C
ns
(1)
The reference points for the rise and fall transitions are measured at V
IL
MAX and V
IH
MIN.
(2)
C = MXI2/CLKIN2 cycle time in ns. For example, when MXI2/CLKIN2 frequency is 27 MHz use C = 37.037 ns.
(3)
tc(MXI2) = 37.037 ns is the only supported cycle time for MXI2/CLKIN2.
Figure 5-8. MXI2/CLKIN2 Timing
Peripheral Information and Electrical Specifications
101