MPC7455 datasheet(53/64 Pages) FREESCALE

53 / 64 page

MPC7455 RISC Microprocessor Hardware Specifications, Rev. 4.1

Freescale Semiconductor

System Design Information

mutually exclusive and it is never necessary to populate both in a system. To preserve correct power-down operation,

QACK should be merged via logic so that it also can be driven by the PCI bridge.

Figure 26. JTAG Interface Connection

HRESET

From Target

Board Sources

HRESET

SRESET

VDD_SENSE

5 1

2 k

Ω

10 k

Ω

10 k

Ω

10 k

Ω

OVDD

CHKSTP_IN

TMS

TDO

TDI

TCK

TMS

TDO

TDI

TCK

TRST

(if any)

14 2

Key

QACK

OVDD

10 k

Ω

OVDD

TRST

10 k

Ω

OVDD

10 k

Ω

10 k

Ω

QACK

CHKSTP_OUT

KEY

No Pin

COP Connector

Physical Pin Out

10 k

Ω 4

OVDD

2 k

Ω 3

Ω 5

Notes:

1. RUN/STOP, normally found on pin 5 of the COP header, is not implemented on the MPC7455. Con

pin 5 of the COP header to OVDD with a 10-kΩ pull-up resistor.

2. Key location; pin 14 is not physically present on the COP header.

3. Component not populated. Populate only if debug tool does not drive QACK.

4. Populate only if debug tool uses an open-drain type output and does not actively de-assert QACK

5. If the JTAG interface is implemented, connect HRESET from the target source to TRST from the

header though an AND gate to TRST of the part. If the JTAG interface is not implemented, con

HRESET from the target source to TRST of the part through a 0-

Ω isolation reisistor.

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