Motorola MVME2400 Series Service Manual download pdf (Page 80)

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101

2-22 Computer Group Literature Center Web Site

Hawk PCI Host Bridge & Multi-Processor Interrupt Controller

Command Types:

Table 2-7 shows which types of PCI cycles the slave has been designed to

accept.

Addressing:

The PCI Slave will accept any combination of byte enables during read or

write cycles. During write cycles, a discontinuity (i.e., a ‘hole’) in the byte

enables forces the PCI Slave to issue a disconnect. During all read cycles,

the PCI Slave returns an entire word of data regardless of the byte enables.

During I/O read cycles, the PCI Slave performs integrity checking of the

byte enables against the address being presented and assert SERR* in the

event there is an error.

Table 2-7. PCI Slave Response Command Types

Command Type Slave Response?

Interrupt Acknowledge No

Special Cycle No

I/O Read Yes

I/O Write Yes

Reserved No

Memory Read Yes

Memory Write Yes

Reserved No

Configuration Read Yes

Configuration Write Yes

Memory Read Multiple Yes

Dual Address Cycle No

Memory Read Line Yes

Memory Write and

Invalidate

Yes

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