Motorola MVME2300 Series manual Command Types PCI Slave Response, Addressing

Functional Description

Command Types

Table 2-4shows which types of PCI cycles the slave has been designed to accept.

Table 2-4. Command Types — PCI Slave Response

Command Type	Slave Response?
Interrupt Acknowledge	No
Special Cycle	No
I/O Read	Yes
I/O Write	Yes
Reserved	No
Reserved	No
Memory Read	Yes
Memory Write	Yes
Reserved	No
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

Addressing

The 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 will force the slave to issue a disconnect. During all read cycles, the slave will return an entire word of data regardless of the byte enables. During I/O read cycles, the slave will perform integrity checking of the byte enables against the address being presented and assert SERR∗ in the event there is an error.

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