CS5920 datasheet(109/160 Pages) AMCC

109 / 160 page

S5920 – PCI Product

Revision 1.01 – November 28, 2005

AMCC Confidential and Proprietary

DS1596

109

Data Book

Reading the PCI Incoming Mailbox:

1. Check Mailbox Status. Read the mailbox status register to determine if any information has been passed from

the Add-On interface.

2. Read Mailbox. Read the mailbox bytes which MBEF indicates are full. This automatically resets the status bits

in the MBEF and AMBEF registers.

Writing the PCI Outgoing Mailbox:

1. Check Mailbox Status. Read the mailbox status register to determine if information previously written to the

mailbox has been read by the Add-On interface. Writes to full mailbox bytes overwrite data currently in the

mailbox (if not already read by the Add-On interface). Repeat until the byte(s) to be written are empty.

2. Write Mailbox. Write to the outgoing mailbox byte(s).

Mailbox operations for the Add-On interface are functionally identical. The following sequences are suggested for

Add-On mailbox operations using status polling (interrupts disabled):

Reading an Add-On Incoming Mailbox:

1. Check Mailbox Status. Read the mailbox status register to determine if any information has been passed from

the PCI interface.

2. Read Mailbox. Read the mailbox bytes which AMBEF indicates are full. This automatically resets the status

bits in the AMBEF and MBEF registers.

Writing an Add-On Outgoing Mailbox:

1. Check Mailbox Status. Read the mailbox status register to determine if information previously written to the

mailbox has been read by the PCI interface. Writes to full mailbox bytes overwrite data currently in the mailbox

(if not already read by the PCI interface). Repeat until the byte(s) to be written are empty.

2. Write Mailbox. Write to the outgoing mailbox byte(s).

MBEF

Bits 31:28

If a bit is set, valid data is contained in the corresponding mailbox byte.

IMB

Bits 31:0

Mailbox data.

MBEF

Bits 15:12

If a bit is set, valid data is contained in the corresponding mailbox byte

and has not been read by the Add-On.

OMB

Bits 31:0

Mailbox data.

AMBEF

Bits 15:12

If a bit is set, valid data is contained in the corresponding mailbox byte.

AIMB

Bits 31:0

Mailbox data.

AMBEF

Bits 31:28

If a bit is set, valid data is contained in corresponding mailbox byte and

has not been read by the PCI bus.

AOMB

Bits 31:0

Mailbox data.

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