s5935qrc Applied Micro Circuits Corporation (AMCC), s5935qrc Datasheet - Page 66

• Manufacturer Part Number: s5935qrc
• Description: Pci Product
• Manufacturer: Applied Micro Circuits Corporation (AMCC)

S5935 – PCI Product
MAILBOX EMPTY FULL/STATUS REGIS-
TER (MBEF)
Figure 28. Mailbox Empty/Full Status Register
66
Register Name
PCI Address Offset
Power-up value
Attribute
Size
DS1527
31
Mailbox Empty/Full Status
34h
00000000h
Read Only
32 bits
16
15
This register provides empty/full visibility of each byte
within the mailboxes. The empty/full status for the Out-
going mailboxes is displayed on the low-order 16 bits
and the empty/full status for the Incoming mailboxes is
presented on the high-order 16 bits. A value of 1 signi-
fies that a given mailbox has been written by one bus
interface but has not yet been read by the correspond-
ing destination interface. A PCI bus incoming mailbox
is defined as one in which data travels from the Add-
On bus into the PCI bus, and an outgoing mailbox is
defined as one where data travels out from the PCI
bus to the Add-On interface.
Revision 1.02 – June 27, 2006
AMCC Confidential and Proprietary
0
Bit
Value
Outgoing Mailbox
Status (RO)
Incoming Mailbox
Status (RO)
Data Book