Datasheet

MPC5674F Microcontroller Data Sheet, Rev. 9
Electrical Characteristics
Freescale Semiconductor50
4.12.4 Nexus Timing
Table 34. Nexus Debug Port Timing
1
1
All Nexus timing relative to MCKO is measured from 50% of MCKO and 50% of the respective signal. Nexus timing specified
at V
DD
= 1.08 V to 1.32 V, V
DDE
= 3.0 V to 3.6 V, V
DD33
and V
DDSYN
= 3.0 V to 3.6 V, T
A
=T
L
to T
H
, and C
L
= 30 pF with
DSC = 0b10.
Spec Characteristic Symbol Min Max Unit
1 MCKO Cycle Time t
MCYC
2
2
2
The Nexus AUX port runs up to 82 MHz (pending characterization). Set NPC_PCR[MKCO_DIV] to correct division depending
on the system frequency, not to exceed maximum Nexus AUX port frequency.
8t
CYC
3
3
See Notes on t
cyc
Table 27 in Section Section 4.11.1, Clocking.
2 MCKO Duty Cycle t
MDC
40 60 %
3 MCKO Low to MDO Data Valid
4
4
MDO, MSEO, and EVTO data is held valid until next MCKO low cycle.
t
MDOV
–0.1 0.2 t
MCYC
4 MCKO Low to MSEO Data Valid
4
t
MSEOV
–0.1 0.2 t
MCYC
5 MCKO Low to EVTO Data Valid
4
t
EVTOV
–0.1 0.2 t
MCYC
6 EVTI Pulse Width t
EVTIPW
4.0 — t
TCYC
3
7 EVTO Pulse Width t
EVTOPW
1— t
MCYC
8 TCK Cycle Time t
TCYC
4
5
5
Lower frequency is required to be fully compliant to standard.
—t
CYC
3
9 TCK Duty Cycle t
TDC
40 60 %
10 TDI, TMS Data Setup Time t
NTDIS,
t
NTMSS
8— ns
11 TDI, TMS Data Hold Time T
NTDIH,
t
NTMSH
5— ns
12 TCK Low to TDO Data Valid t
NTDOV
010 ns
13 RDY
Valid to MCKO
6
6
The RDY pin timing is asynchronous to MCKO. The timing is guaranteed by design to function correctly.
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