MPC8378E datasheet(60/127 Pages) FREESCALE

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MPC8378E PowerQUICC II Pro Processor Hardware Specifications, Rev. 4

Freescale Semiconductor

JTAG

Figure 36 provides the AC test load for TDO and the boundary-scan outputs of the device.

Figure 36. AC Test Load for the JTAG Interface

Figure 37 provides the JTAG clock input timing diagram.

Figure 37. JTAG Clock Input Timing Diagram

Figure 38 provides the TRST timing diagram.

Figure 38. 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 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 (see Figure 21).

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.

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

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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