MPC8280 datasheet(25/83 Pages) FREESCALE

25 / 83 page

MPC8280 PowerQUICC II Family Hardware Specifications, Rev. 2

Freescale Semiconductor

AC Electrical Characteristics

This table is a representation of the information in Table 15.

Figure 12. Internal Tick Spacing for Memory Controller Signals

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. Tick Spacing for Memory Controller Signals

PLL Clock Ratio

Tick Spacing (T1 Occurs at the Rising Edge of CLKin)

1:2, 1:3, 1:4, 1:5, 1:6

1/4 CLKin

1/2 CLKin

3/4 CLKin

1:2.5

3/10 CLKin

1/2 CLKin

8/10 CLKin

1:3.5

4/14 CLKin

1/2 CLKin

11/14 CLKin

Table 16. 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

CLKin

for 1:2.5

for 1:3.5

CLKin

for 1:2, 1:3, 1:4, 1:5, 1:6

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