R4430PCP10MCM 데이터 시트보기 (PDF) - Aeroflex Corporation

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R4430PCP10MCM

A MIPS© R4400 RISC Microprocessor Multichip Module

Aeroflex Corporation 

7.0 Signal Descriptions

System Interface Signals

SysAD(63:0)

SysADC(7:0)

SysCmd(8:0)

SysCmdP

Validin*

ValidOut*

ExtRqst*

Release*

RdRdy*

WrRdy*

IvdAck*

IvdErr*

I/O System address/data bus: A 64 bit address and data

bus for communication between the processor and an

external agent

I/O System address/data check bus: An 8 bit bus contain-

ing check bits for the SysAD bus

I/O System command/identifier bus parity: A 9 bit bus for

command and data identifier transmission between the

processor and an external agent

I/O System command /data identifier bus parity: A single,

even parity bit for thr SysCmd bus

I Valid Input: An external agent asserts ValidIn* when it

is driving a valid address or data on the SysAD bus and

a valid command or data identifier on the SysCmd bus

O Valid Output: The processor asserts ValidOut* when it

is driving a valid address or data on the SysAD bus and

a valid command or data identifier on the SYSCMD bus

I External Request: An external agent asserts ExtRqst* to

request the use of the system interface. The processor

grants the request by asserting Release*

O Release Interface: In response to the assertion of

ExtRqst*, the processor asserts Release* to signal the

requesting device that the system interface is available

I Read ready: The external agent asserts RdRdy*to indi-

cate that it can accept processor read, invalidate, or

update requests in both overlap and non-overlap mode

or can accept a read followed by a potential invalidate

or update request in the overlap mode

I Write ready: An external agent asserts WrRdy* when it

can accept a processor write request

I Invalidate acknowledge: An external agent asserts

IvdAck* to signal successful completion of a processor

invalidate or update request (MC only)

I Invalidate error: An external agent asserts InvErr* to

signal unsuccessful completion of a processor invali-

date or update request(MC only)

5

SCD4430 Rev A 11/18/96

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