SPC5644AF0MLU2 datasheet(103/138 Pages) FREESCALE

103 / 138 page

MPC5644A Microcontroller Data Sheet, Rev. 7

Freescale Semiconductor

103

Figure 15. Nexus output timing

tNTDIS

D TDI Data Setup Time

—

tNTDIH

D TDI Data Hold Time

—

tNTMSS

D TMS Data Setup Time

—

tNTMSH

D TMS Data Hold Time

—

D TDO propagation delay from falling

edge of TCK

—

19.5

—

D TDO hold time with respect to TCK

falling edge (minimum TDO

propagation delay)

5.25

—

1 All Nexus timing relative to MCKO is measured from 50% of MCKO and 50% of the respective signal. Nexus timing

specified at VDD = 1.14 V to 1.32 V, VDDEH = 4.5 V to 5.5 V with multi-voltage pads programmed to Low-Swing

mode, TA =TL to TH, and CL = 30 pF with DSC = 0b10.

2 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.

3 This is a functionally allowable feature. However, this may be limited by the maximum frequency specified by the

Absolute minimum MCKO period specification.

4 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.

5 MDO, MSEO, and EVTO data is held valid until next MCKO low cycle.

6 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.

7 This is a functionally allowable feature. However, this may be limited by the maximum frequency specified by the

Absolute minimum TCK period specification.

8 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.

Table 39. Nexus debug port timing1 (continued)

Symbol

Characteristic

Min. Value Max. Value

Unit

MCKO

MDO

MSEO

EVTO

Output Data Valid

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