s5920 Applied Micro Circuits Corporation (AMCC), s5920 Datasheet - Page 71
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s5920
Manufacturer Part Number
s5920
Description
Pci Product
Manufacturer
Applied Micro Circuits Corporation (AMCC)
Datasheet
1.S5920.pdf
(165 pages)
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S5920 – PCI Product: Operation Registers
OPERATION REGISTERS
All S5920 control and communications are performed
through two register groups: PCI Operation Registers
Add-On Operation Registers. Some registers in both
groups are accessible from both buses. This chapter
describes the PCI Operation Register set first and then
the Add-On Operation Register set for easier under-
standing. An access to a register common to both
buses at the same time is not allowed. Unpredictable
behavior may occur.
Table 39. Operation Registers - PCI Bus
Note: Absolute register address locations are acquired by adding BADR0 to the “address offset” listed above.
AMCC Confidential and Proprietary
Address Offset
0Ch
1Ch
3Ch
34h
38h
60h
Abbreviation
INTCSR
MBEF
PTCR
OMB
RCR
IMB
Outgoing Mailbox Register
Incoming Mailbox Register
Mailbox Empty/Full Status Register
Interrupt Control/Status Register
Reset Control Register
Pass-Thru Configuration Register
PCI BUS OPERATION REGISTERS
The PCI bus operation registers are mapped as 6
DWORD registers located at the address space (I/O or
memory) specified by Base Address Register 0. These
locations are the primary method of communication
between the PCI and Add-On buses. It is NOT recom-
mended to read or write from an undefined address.
The read results and write effects cannot be guaran-
teed. Table 1 lists the PCI Bus Operation Registers.
Register Name
Revision 1.02 – April 12, 2007
Data Book
DS1596
71
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