MPC8313ECVRGDF datasheet(92/100 Pages) FREESCALE

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MPC8313E PowerQUICC™ II Pro Processor Hardware Specifications, Rev. 2.1

Freescale Semiconductor

System Design Information

22.8

Pull-Up Resistor Requirements

The MPC8313E requires high resistance pull-up resistors (10 k

Ω is recommended) on open drain type pins

including I2C, Ethernet management MDIO, and IPIC (integrated programmable interrupt controller).

Correct operation of the JTAG interface requires configuration of a group of system control pins as

demonstrated in Figure 61. Care must be taken to ensure that these pins are maintained at a valid deasserted

state under normal operating conditions because most have asynchronous behavior and spurious assertion,

which give unpredictable results.

Refer to the PCI 2.2 Specification, for all pull-ups required for PCI.

22.9

JTAG Configuration Signals

Boundary scan testing is enabled through the JTAG interface signals. The TRST signal is optional in

IEEE 1149.1, but is provided on any Freescale devices that are built on Power Architecture technology.

The device requires TRST to be asserted during reset conditions to ensure the JTAG boundary logic does

not interfere with normal chip operation. While it is possible to force the TAP controller to the reset state

using only the TCK and TMS signals, systems generally assert TRST during power-on reset. Because the

JTAG interface is also used for accessing the common on-chip processor (COP) function, simply tying

TRST to PORESET is not practical.

The COP function of these processors allows a remote computer system (typically, a PC with dedicated

hardware and debugging software) to access and control the internal operations of the processor. The COP

interface connects primarily through the JTAG port of the processor, with some additional status

monitoring signals. The COP port requires the ability to independently assert TRST without causing

PORESET. If the target system has independent reset sources, such as voltage monitors, watchdog timers,

power supply failures, or push-button switches, then the COP reset signals must be merged into these

signals with logic.

The arrangement shown in Figure 61 allows the COP to independently assert HRESET or TRST, while

ensuring that the target can drive HRESET as well. If the JTAG interface and COP header are not used,

TRST should be tied to PORESET so that it is asserted when the system reset signal (PORESET) is

asserted.

The COP header shown in Figure 61 adds many benefits—breakpoints, watchpoints, register and memory

examination/modification, and other standard debugger features are possible through this interface—and

can be as inexpensive as an unpopulated footprint for a header to be added when needed.

The COP interface has a standard header for connection to the target system, based on the 0.025"

square-post, 0.100" centered header assembly (often called a Berg header).

There is no standardized way to number the COP header shown in Figure 61; consequently, many different

pin numbers have been observed from emulator vendors. Some are numbered top-to-bottom then

left-to-right, while others use left-to-right then top-to-bottom, while still others number the pins counter

clockwise from pin 1 (as with an IC). Regardless of the numbering, the signal placement recommended in

Figure 61 is common to all known emulators.

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