MPC5553_07 datasheet(31/66 Pages) FREESCALE

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Electrical Characteristics

MPC5553 Microcontroller Data Sheet, Rev. 2.0

Freescale Semiconductor

3.13.3

Nexus Timing

Figure 10. Nexus Output Timing

Table 21. Nexus Debug Port Timing1

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 VDD = 1.35–1.65 V, VDDE = 2.25–3.6 V,

VDD33 and VDDSYN = 3.0–3.6 V, TA = TL to TH, and CL = 30 pF with DSC = 0b10.

Spec

Characteristic

Symbol

Min

Max

Unit

MCKO cycle time

tMCYC

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.

8tCYC

MCKO duty cycle

tMDC

MCKO low to MDO data valid3

3 MDO, MSEO, and EVTO data is held valid until the next MCKO low cycle occurs.

tMDOV

–1.5

3.0

MCKO low to MSEO data valid3

tMSEOV

–1.5

3.0

MCKO low to EVTO data valid3

tEVTOV

–1.5

3.0

EVTI pulse width

tEVTIPW

4.0

—

tTCYC

EVTO pulse width

tEVTOPW

1—

tMCYC

TCK cycle time

tTCYC

4 Limit the maximum frequency to approximately 16 MHz (V

DDE = 2.25–3.0 V) or 22 MHz (VDDE = 3.0–3.6 V) to meet the timing

specification for tJOV of [0.2 x tJCYC] as outlined in the IEEE-ISTO 5001-2003 specification.

—tCYC

TCK duty cycle

tTDC

TDI, TMS data setup time

tNTDIS, tNTMSS

8—

TDI, TMS data hold time

tNTDIH, tNTMSH

5—

TCK low to TDO data valid

tJOV

VDDE = 2.25–3.0 V

VDDE = 3.0–3.6 V

RDY valid to MCKO5

5 The RDY pin timing is asynchronous to MCKO. The timing is guaranteed by design to function correctly.

——

—

MCKO

MDO

MSEO

EVTO

Output Data Valid

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