PCI9060ES datasheet(4/192 Pages) ETC

4 / 192 page

PCI 9080

TABLE OF CONTENTS

©PLX Technology, Inc., 1997

Page v

Version 1.01

3.6.2.3

Deadlock and BREQo................................................................................................................................................... 26

3.6.2.3.1

Backoff.................................................................................................................................................................... 26

3.6.2.3.2

Software/Hardware Solution for Systems without Backoff Capability ..................................................................... 27

3.6.2.3.3

Software Solutions to Deadlock .............................................................................................................................. 27

3.6.2.4

Direct Slave Lock.......................................................................................................................................................... 27

3.6.3

Direct Slave Priority .......................................................................................................................................................... 27

3.7

DMA OPERATION ..................................................................................................................................................28

3.7.1

Non-Chaining Mode DMA ................................................................................................................................................. 28

3.7.2

Chaining Mode DMA......................................................................................................................................................... 29

3.7.3

DMA Data Transfers ......................................................................................................................................................... 31

3.7.3.1

Local to PCI Bus DMA Transfer.................................................................................................................................... 31

3.7.3.2

PCI to Local Bus DMA Transfer.................................................................................................................................... 32

3.7.3.3

Unaligned Transfers ..................................................................................................................................................... 32

3.7.4

Demand Mode DMA ......................................................................................................................................................... 32

3.7.5

DMA Priority...................................................................................................................................................................... 33

3.7.6

DMA Arbitration ................................................................................................................................................................ 33

3.7.6.1

End of Transfer (EOT0# or EOT1#) Input ..................................................................................................................... 33

3.7.6.2

DMA Abort .................................................................................................................................................................... 33

3.7.6.3

Local Latency and Pause Timers.................................................................................................................................. 33

3.8

VENDOR AND DEVICE ID REGISTERS ...............................................................................................................34

3.9

DOORBELL REGISTERS .......................................................................................................................................34

3.10

MAILBOX REGISTERS...........................................................................................................................................34

3.11

USER INPUT AND OUTPUT ..................................................................................................................................34

3.12

INTERRUPTS .........................................................................................................................................................35

3.12.1

PCI Interrupts (INTA#) ...................................................................................................................................................... 35

3.12.1.1

Local Interrupt Input .................................................................................................................................................. 35

3.12.1.2

Master/Target Abort Interrupt.................................................................................................................................... 35

3.12.2

Local Interrupts (LINTo#) .................................................................................................................................................. 36

3.12.2.1

Local to PCI Doorbell Interrupt.................................................................................................................................. 36

3.12.2.2

PCI to Local Doorbell Interrupt.................................................................................................................................. 36

3.12.2.3

Built-In Self Test Interrupt (BIST) .............................................................................................................................. 36

3.12.2.4

DMA Channel 0/1 Interrupts ..................................................................................................................................... 36

3.12.3

PCI SERR# (PCI NMI) ...................................................................................................................................................... 37

3.12.4

Local LSERR# (Local NMI)............................................................................................................................................... 37

3.13

I20 COMPATIBLE MESSAGE UNIT .......................................................................................................................37

3.13.1

Inbound Messages ........................................................................................................................................................... 38

3.13.2

Outbound Messages......................................................................................................................................................... 38

3.13.3

I2O Pointer Management .................................................................................................................................................. 38

3.13.4

Inbound Free List FIFO..................................................................................................................................................... 39

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