Datasheet

Electrical Characteristics
MPC5566 Microcontroller Data Sheet, Rev. 3
Freescale
31
3.13.3 Nexus Timing
Figure 10. Nexus Output Timing
Table 21. Nexus Debug Port Timing
1
1
JTAG specifications apply when used for debug functionality. All Nexus timing relative to MCKO is measured from 50% of
MCKO and 50% of the respective signal. Nexus timing specified at V
DD
= 1.35–1.65 V, V
DDE
= 2.25–3.6 V,
V
DD33
and V
DDSYN
= 3.0–3.6 V, T
A
= T
L
to T
H
, and CL = 30 pF with DSC = 0b10.
Spec Characteristic Symbol Min. Max. Unit
1 MCKO cycle time t
MCYC
1
2
2
The Nexus AUX port runs up to 82 MHz. Set NPC_PCR[MCKO_DIV] to divide-by-two if the system frequency
is greater than 82 MHz.
8t
CYC
2 MCKO duty cycle t
MDC
40 60 %
3 MCKO low to MDO data valid
3
3
MDO, MSEO, and EVTO data is held valid until the next MCKO low cycle occurs.
t
MDOV
–1.5 3.0 ns
4 MCKO low to MSEO data valid
3
t
MSEOV
–1.5 3.0 ns
5 MCKO low to EVTO
data valid
3
t
EVTOV
–1.5 3.0 ns
6 EVTI pulse width t
EVTIPW
4.0 — t
TCYC
7 EVTO pulse width t
EVTOPW
1—t
MCYC
8 TCK cycle time t
TCYC
4
4
4
Limit the maximum frequency to approximately 16 MHz (V
DDE
= 2.25–3.0 V) or 20 MHz (V
DDE
= 3.0–3.6 V) to meet the timing
specification for t
JOV
of [0.2 x t
JCYC
] as outlined in the IEEE-ISTO 5001-2003 specification.
—t
CYC
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
JOV
V
DDE
= 2.25–3.0 V 0 12 ns
V
DDE
= 3.0–3.6 V 0 10 ns
13 RDY valid to MCKO
5
5
The RDY pin timing is asynchronous to MCKO and is guaranteed by design to function correctly.
————
1
2
3
4
5
MCKO
MDO
MSEO
EVTO
Output Data Valid