Emerson PMPPC7448 user manual PRESENT* Present

System Controller: PCI Bus Control Signals

PRESENT*: PRESENT

When grounded, this input signal indicates to a carrier that a PPMC module is

installed.

RESET_OUT*: RESET OUTPUT

This output signal may be used to support a reset button or other reset

source on the PPMC module. It is an open drain output from the PPMC module that

becomes an input to the reset logic on the carrier card. To avoid reset loops, do not use

RST* to generate RESET_OUT*.

REQ64*: REQUEST 64-bit TRANSFER When asserted by the current bus master, this sustained

three-state line indicates the ability to transfer data using 64 bits.

REQ*: REQUEST

This three-state signal indicates to the arbiter that a particular master wants to

use the bus.

RST*:

RESET

The assertion of this input signal brings PCI registers, sequencers, and signals to a

consistent state. The carrier card generates this system reset signal (pull-up resistor

required) as an input to all PPMC modules.

SERR*:

SYSTEMS ERROR

This open-drain output signal is used to report any system error with

catastrophic results.

STOP*: STOP

A sustained three-state signal used by the current target to request that the bus

master stop the current transaction.

TCK:

TEST CLOCK

This input signal clocks state information and test data into and out of the

device during operation of the TAP.

TDI:

TEST DATA INPUT

This input signal serially shifts test data and test instructions into the

device during TAP operations.

TDO: TEST DATA OUTPUT

This output signal serially shifts test data and test instructions out of

the device during TAP operation.

TMS: TEST MODE SELECT

This input signal controls the state of the TAP controller in the device.

TRDY*: TARGET READY

A sustained three-state signal that indicates the target’s ability to com-

plete the current data phase of the transaction.

TRST*:

TEST RESET

This input signal provides asynchronous initialization of the TAP controller.

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