MPC8347ECVRADDB datasheet(44/99 Pages) NXP

44 / 99 page

MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 12

Freescale Semiconductor

JTAG

Figure 27 provides the AC test load for TDO and the boundary-scan outputs of the MPC8347EA.

Figure 27. AC Test Load for the JTAG Interface

Figure 28 provides the JTAG clock input timing diagram.

Figure 28. JTAG Clock Input Timing Diagram

Figure 29 provides the TRST timing diagram.

Figure 29. TRST Timing Diagram

JTAG external clock to output high impedance:

Boundary-scan data

TDO

tJTKLDZ

tJTKLOZ

5, 6

Notes:

1. All outputs are measured from the midpoint voltage of the falling/rising edge of tTCLK 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 (see Figure 18).

Time-of-flight delays must be added for trace lengths, vias, and connectors in the system.

2. The symbols for timing specifications 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. In general, the clock reference symbol is

based on three letters representing the clock of a particular function. 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 tTCLK.

5. Non-JTAG signal output timing with respect to tTCLK.

6. Guaranteed by design and characterization.

Table 41. JTAG AC Timing Specifications (Independent of CLKIN)1 (continued)

At recommended operating conditions (see Table 2).

Parameter

Symbol2

Min

Max

Unit

Notes

Output

Z0 = 50 Ω

OVDD/2

RL = 50 Ω

JTAG

tJTKHKL

tJTGR

External Clock

tJTG

tJTGF

VM = Midpoint Voltage (OVDD/2)

TRST

VM = Midpoint Voltage (OVDD/2)

tTRST

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