MPC5125 datasheet(85/94 Pages) FREESCALE

85 / 94 page

System Design Information

MPC5125 Microcontroller Data Sheet, Rev. 4

Freescale Semiconductor

For a board with a COP (common on-chip processor) connector that accesses the JTAG interface and needs to reset the JTAG

module, it is not recommended to wire only TRST and PORESET.

To reset the MPC5125 via the COP connector, the HRESET pin of the COP should be connected to the HRESET pin of the

MPC5125. The circuitry shown in Figure 51 allows the COP to assert HRESET or TRST separately, while any other board

sources can drive PORESET.

Table 49. COP/BDM Interface Signals

BDM Pin #

I/O Pin

BDM Connector

Internal

Pullup/Pulldown

External

Pullup/Pulldown

I/O1

NOTES:

1 With respect to the emulator tool’s perspective:



Input is really an output from the embedded e300 core.



Output is really an input to the core.

—

GND

—

CKSTP_OUT

ckstp_out

—

10 k

 Pullup

—

KEY

—

HRESET

hreset

Pullup

10 k

 Pullup

—

GND

—

SRESET

sreset

Pullup

10 k

 Pullup

—

N/C

—

TMS

tms

Pullup

10 k

 Pullup

CKSTP_IN

ckstp_in

—

10 k

 Pullup

TCK

tck

Pullup

10 k

 Pullup

—

VDD2

2 From the board under test, power sense for chip power.

——

—

See Note3

3 HALTED is not available from e300 core.

halted3

——

4TRST

trst

Pullup

10 k

 Pullup

TDI

tdi

Pullup

10 k

 Pullup

See Notepci_frame

qack4

——

1TDO

tdo

—

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