MPC8271VR datasheet(26/61 Pages) FREESCALE

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MPC8272 PowerQUICC II Family Hardware Specifications, Rev. 3

Freescale Semiconductor

AC Electrical Characteristics

NOTE

The UPM machine outputs change on the internal tick determined by the

memory controller programming; the AC specifications are relative to the

internal tick. Note that SDRAM and GPCM machine outputs change on

CLKin’s rising edge.

6.3

JTAG Timings

This table lists the JTAG timings.

Table 15. JTAG Timings1

Parameter

Symbol2

Min

Max

Unit

Notes

JTAG external clock frequency of operation

fJTG

033.3

MHz

—

JTAG external clock cycle time

tJTG

—

JTAG external clock pulse width measured at 1.4V

tJTKHKL

—

JTAG external clock rise and fall times

tJTGR and

tJTGF

TRST assert time

tTRST

—

3, 6

Input setup times

Boundary-scan data

TMS, TDI

tJTDVKH

tJTIVKH

—

4, 7

Input hold times

Boundary-scan data

TMS, TDI

tJTDXKH

tJTIXKH

—

4, 7

Output valid times

Boundary-scan data

TDO

tJTKLDV

tJTKLOV

—

5, 7

5. 7

Output hold times

Boundary-scan data

TDO

tJTKLDX

tJTKLOX

—

5, 7

JTAG external clock to output high impedance

Boundary-scan data

TDO

tJTKLDZ

tJTKLOZ

5, 6

1 All outputs are measured from the midpoint voltage of the falling/rising edge of t

TCLK to the midpoint of the signal in question.

The output timings are measured at the pins. All output timings assume a purely resistive 50-

Ω load. Time-of-flight delays

must be added for trace lengths, vias, and connectors in the system.

2 The symbols used for timing specifications herein follow the pattern of t

(first two letters of functional block)(signal)(state) (reference)(state)

for inputs and t((first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tJTDVKH symbolizes JTAG

device timing (JT) with respect to the time data input signals (D) reaching the valid state (V) relative to the tJTG clock reference

(K) going to the high (H) state or setup time. Also, tJTDXKH symbolizes JTAG timing (JT) with respect to the time data input

signals (D) went invalid (X) relative to the tJTG clock reference (K) going to the high (H) state. Note that, in general, the clock

reference symbol representation is based on three letters representing the clock of a particular functional. For rise and fall

times, the latter convention is used with the appropriate letter: R (rise) or F (fall).

3 TRST is an asynchronous level sensitive signal. The setup time is for test purposes only.

4 Non-JTAG signal input timing with respect to t

TCLK.

5 Non-JTAG signal output timing with respect to t

TCLK.

6 Guaranteed by design.

7 Guaranteed by design and device characterization.

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