Revision 1.02 – June 27, 2006
S5935 – PCI Product
Data Book
This register provides empty/full visibility of each byte
within the mailboxes. The empty/full status for the Out-
going mailboxes are displayed on the high order 16
bits and the empty/full status for the incoming mail-
boxes are presented on the low order 16 bits. A value
of one signifies that a given mailbox had been written
by the sourcing interface but had not yet been read by
the corresponding destination interface. An incoming
mailbox is defined as one in which data travels from
the PCI bus into the Add-On bus and an outgoing mail-
box is defined as one where data goes OUT from the
Add-On bus to the PCI interface.
ADD-ON EMPTY/FULL STATUS REGISTER
(AMBEF)
Add-On Mailbox Empty/Full Status
34h
Register Name
Add-On
Address Offset
00000000h
Read Only
32 bits
Power-up value
Attribute
Size
Figure 34. Add-On Mailbox Empty/Full Status Register
31
16 15
0 Bit
Value
Incoming Mailbox
Status (RO)
Outgoing Mailbox
Status (RO)
AMCC Confidential and Proprietary
DS1527
81
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
