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CS5920 Arkusz danych(PDF) 78 Page - Applied Micro Circuits Corporation

Numer części CS5920
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PDF  160 Pages
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Producent  AMCC [Applied Micro Circuits Corporation]
Strona internetowa  http://www.amcc.com
Logo AMCC - Applied Micro Circuits Corporation

CS5920 Arkusz danych(HTML) 78 Page - Applied Micro Circuits Corporation

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S5920 – PCI Product
Revision 1.01 – November 28, 2005
AMCC Confidential and Proprietary
DS1596
78
Data Book
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 32. Mailbox Empty/Full Status Register
Register Name:
Mailbox Empty/Full Status
Add-On Address:
34h
Power-up value:
00000000h
Add-On Attribute:
Read Only
Size:
32 bits
0
31
Add-On Incoming Mailbox Status
(RO)
0000
16
15
12
11
0000
27
28
Reserved
Reserved
Add-On Outgoing Mailbox Status
(RO)



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