MPC8544E datasheet(57/117 Pages) FREESCALE

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MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5

Freescale Semiconductor

JTAG

Figure 34 provides the AC test load for TDO and the boundary-scan outputs.

Figure 34. AC Test Load for the JTAG Interface

Figure 35 provides the JTAG clock input timing diagram.

Figure 35. JTAG Clock Input Timing Diagram

Figure 36 provides the TRST timing diagram.

Figure 36. TRST Timing Diagram

JTAG external clock to output high impedance:

Boundary-scan data

TDO

tJTKLDZ

tJTKLOZ

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 34).

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

2. The symbols used 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. 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 tTCLK.

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

Table 50. JTAG AC Timing Specifications (Independent of SYSCLK)1 (continued)

At recommended operating conditions (see Table 3).

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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