mpc5644a Freescale Semiconductor, Inc, mpc5644a Datasheet - Page 110

• Manufacturer Part Number: mpc5644a
• Description: Mpc5644a Microcontroller Data Sheet
• Manufacturer: Freescale Semiconductor, Inc

Electrical characteristics
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All Nexus timing relative to MCKO is measured from 50% of MCKO and 50% of the respective signal. Nexus timing
specified at V
mode, T
Achieving the absolute minimum MCKO cycle time may require setting the MCKO divider to more than its minimum
setting (NPC_PCR[MCKO_DIV] depending on the actual system frequency being used.
This is a functionally allowable feature. However, this may be limited by the maximum frequency specified by the
Absolute minimum MCKO period specification.
This may require setting the MCO divider to more than its minimum setting (NPC_PCR[MCKO_DIV]) depending on
the actual system frequency being used.
MDO, MSEO, and EVTO data is held valid until next MCKO low cycle.
Achieving the absolute minimum TCK cycle time may require a maximum clock speed (system frequency / 8) that
is less than the maximum functional capability of the design (system frequency / 4) depending on the actual system
frequency being used.
This is a functionally allowable feature. However, this may be limited by the maximum frequency specified by the
Absolute minimum TCK period specification.
This may require a maximum clock speed (system frequency / 8) that is less than the maximum functional capability
of the design (system frequency / 4) depending on the actual system frequency being used.
#
MCKO
MDO
MSEO
EVTO
t
t
t
t
NTMSS
NTMSH
NTDIS
NTDIH
A
—
—
Symbol
= T
L
DD
to T
= 1.14 V to 1.32 V, V
CC
CC
CC
CC
CC
CC
H
, and C
C
D
D
P
P
P
P
Table 36. Nexus debug port timing
L
TDI Data Setup Time
TDI Data Hold Time
TMS Data Setup Time
TMS Data Hold Time
TDO propagation delay from falling
edge of TCK
TDO hold time with respect to TCK
falling edge (minimum TDO
propagation delay)
= 30 pF with DSC = 0b10.
Preliminary—Subject to Change Without Notice
MPC5644A Microcontroller Data Sheet, Rev. 4
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4
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Figure 15. Nexus output timing
DDEH
Characteristic
= 4.5 V to 5.5 V with multi-voltage pads programmed to Low-Swing
1
2
Output Data Valid
1
Min. Value Max. Value
(continued)
5.25
25
25
—
5
5
19.5
—
—
—
—
—
Freescale Semiconductor
Unit
ns
ns
ns
ns
ns
ns