CS5320 datasheet(71/160 Pages) AMCC

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S5320 – PCI Match Maker: Operation Registers

Revision 5.03 – June 14, 2006

AMCC Confidential and Proprietary

DS1656

Data Sheet

Add-On Mailbox Empty/full Status Register

(AMBEF)

This register provides empty/full visibility for each byte

within the mailboxes. The empty/full status for the

Add-On Incoming mailbox is displayed on bits 15 to 12

and the empty/full status for the Add-On Out-going

mailbox is presented on bits 31 to 28. A value of 1 sig-

nifies that a given mailbox has been written by one bus

interface but has not yet been read by the correspond-

ing destination interface. The Add-On bus incoming

mailbox is used to transfer data from the PCI bus to

the Add-On bus, and the Add-On outgoing mailbox is

used to transfer data from the Add-On bus to the PCI

bus. This register is also referred to as the PCI Mail-

box Empty/Full Status Register (MBEF).

Figure 31. Mailbox Empty/Full Status Register

Mailbox Empty/Full Status

Add-On Address:

34h

Power-up value:

00000000h

Add-On Attribute:

Read Only

Size:

32 bits

Add-On Incoming Mailbox Status

(RO)

0000

Reserved

Add-On Outgoing Mailbox Status

(RO)

CS5320 数据表(PDF) 71 Page - Applied Micro Circuits Corporation

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