S5920Q Applied Micro Circuits Corporation, S5920Q Datasheet - Page 83
S5920Q
Manufacturer Part Number
S5920Q
Description
Manufacturer
Applied Micro Circuits Corporation
Datasheet
1.S5920Q.pdf
(165 pages)
Specifications of S5920Q
Operating Temperature (min)
0C
Operating Temperature Classification
Commercial
Operating Temperature (max)
70C
Package Type
PQFP
Rad Hardened
No
Lead Free Status / Rohs Status
Not Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
S5920Q
Manufacturer:
AMCC
Quantity:
5 510
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S5920 – PCI Product: Operation Registers
ADD-ON MAILBOX EMPTY/FULL STATUS
REGISTER (AMBEF)
Figure 32. Mailbox Empty/Full Status Register
AMCC Confidential and Proprietary
Register Name:
Add-On Address:
Power-up value:
Add-On Attribute:
Size:
31
Mailbox Empty/Full Status
34h
00000000h
Read Only
32 bits
Add-On Outgoing Mailbox Status
(RO)
28
27
0000
16
15
Reserved
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).
Add-On Incoming Mailbox Status
(RO)
12
11
Revision 1.02 – April 12, 2007
0000
Data Book
Reserved
DS1596
0
83
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