S5335 datasheet(76/189 Pages) AMCC

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S5335 – PCI Bus Controller, 3.3V

Revision 5.01 – November 30, 2005

AMCC Confidential and Proprietary

DS1657

Data Sheet

Table 48. Add-On Mailbox Empty/Full Status Register

Bit

Description

31:16

Outgoing Mailbox Status. This field indicates which outgoing mailbox registers have been written by the Add-On bus

interface but have not yet been read by the PCI bus. Each bit location corresponds to a specific byte within one of

the four outgoing mailboxes. A value of one for each bit signifies that the specified mailbox byte is full, a value of

zero signifies empty. The mapping of these status bits to bytes within each mailbox is as follows:

Bit 31 = Outgoing mailbox 4 byte 3

Bit 30 = Outgoing mailbox 4 byte 2

Bit 29 = Outgoing mailbox 4 byte 1

Bit 28 = Outgoing mailbox 4 byte 0

Bit 27 = Outgoing mailbox 3 byte 3

Bit 26 = Outgoing mailbox 3 byte 2

Bit 25 = Outgoing mailbox 3 byte 1

Bit 24 = Outgoing mailbox 3 byte 0

Bit 23 = Outgoing mailbox 2 byte 3

Bit 22 = Outgoing mailbox 2 byte 2

Bit 21 = Outgoing mailbox 2 byte 1

Bit 20 = Outgoing mailbox 2 byte 0

Bit 19 = Outgoing mailbox 1 byte 3

Bit 18 = Outgoing mailbox 1 byte 2

Bit 17 = Outgoing mailbox 1 byte 1

Bit 16 = Outgoing mailbox 1 byte 0

15:00

Incoming Mailbox Status. This field indicates which incoming mailbox registers have been written by the PCI bus but

not yet been read by the Add-On interface. Each bit location corresponds to a specific byte within one of the four

incoming mailboxes. A value of one for each bit signifies that the specified mailbox byte is full, a value of zero signi-

fies empty. The mapping of these status bits to bytes within each mailbox is as follows:

Bit 15 = Incoming mailbox 4 byte 3

Bit 14 = Incoming mailbox 4 byte 2

Bit 13 = Incoming mailbox 4 byte 1

Bit 12 = Incoming mailbox 4 byte 0

Bit 11 = Incoming mailbox 3 byte 3

Bit 10 = Incoming mailbox 3 byte 2

Bit 9 = Incoming mailbox 3 byte 1

Bit 8 = Incoming mailbox 3 byte 0

Bit 7 = Incoming mailbox 2 byte 3

Bit 6 = Incoming mailbox 2 byte 2

Bit 5 = Incoming mailbox 2 byte 1

Bit 4 = Incoming mailbox 2 byte 0

Bit 3 = Incoming mailbox 1 byte 3

Bit 2 = Incoming mailbox 1 byte 2

Bit 1 = Incoming mailbox 1 byte 1

Bit 0 = Incoming mailbox 1 byte 0

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