Emerson CC1000DM I. .B.U. S. . C. .O. N. .T.R. O. .L. .S.I.G. N. .A.L. S, PCI Bus Control Signals

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TDO:

P M C / P C I I N T E R F A C E

PCI Bus Control Signals

Test Data Output signal acts as the output port for test data and test instructions out of the PMC slots during TAP operation.

TMS: Test Mode Select controls the state of the TAP controller in the PMC slots.

TDI: Test Data Input signal acts as the input port for test data and test instructions into the PMC slots during TAP operation.

.P.C.I. .B.U. S. . C. .O. N. .T.R. O. .L. .S.I.G. N. .A.L. S. . . . . . . . . . . . . . . . . . . . . . . . .

The following signals for the PCI interface are available on connectors J1x and J2x. Refer to the PCI specification for detailed usage on these signals. All signals are bi- directional unless otherwise stated.

ACK64*, REQ64*: ACKNOWLEDGE and REQUEST output signals are used to tell a 64-bit PCI device whether to use the 64-bit or the 32-bit data width.

AD00-AD63:ADDRESS and DATA bus (bits 0-63) tri-state lines are used for both address and data handling. A bus transaction consists of an address phase followed by one or more data phases.

C/BE0* - C/BE7*: BUS COMMAND and BYTE ENABLES tri-state lines have different functions depending on the phase of a transaction. During the address phase of a transaction these lines define the bus command. During a data phase the lines are used as byte enables.

CLK: CLOCK input signal to the PMC modules provides timing for PCI transactions.

DEVSEL*: DEVICE SELECT sustained tri-state signal indicates when a device on the bus has been selected as the target of the current access.

EREADY: ENUMERATION READY open-drain output signal of a non-Monarch PrPMC indicates it has completed its on-board initialization and can respond to PCI bus enumeration. As an input signal to the Monarch PrPMC, it indicates all non-Monarchs have completed their on-board initialization and can respond to PCI bus enumeration.

FRAME*: CYCLE FRAME sustained tri-state line is driven by the current master to indicate the beginning of an access, and continues to be asserted until the transaction reaches its final data phase.

GNT*: GRANT input signal indicates that access to the bus has been granted to a particular master. Each master has its own GNT*.

IDSEL: INITIALIZATION DEVICE SELECT input signal acts as a chip select during configuration read and write transactions.

IDSELB: INITIALIZATION DEVICE SELECT B; if the optional second PCI agent is implemented, then IDSELB is connected as its IDSEL input.

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