
S5335 – PCI Bus Controller, 3.3V
Revision 5.01 – November 30, 2005
Data Sheet
AMCC Confidential and Proprietary
DS1657 33
PCI Status Register (PCISTS)
This 16-bit register contains the PCI status informa-
tion. The function of this register is defined by the PCI
specification and its implementation is required of all
PCI devices. Only some of the bits are used by this
device; those which are not used are hardwired to 0.
Most status bits within this register are designated as
“write clear,” meaning that in order to clear a given bit,
the bit must be written as a 1. All bits written with a 0
are left unchanged. These bits are identified in Figure
10 as (R/WC). Those which are Read Only are shown
as (RO) in Figure 10.
Figure 10. PCI Status Register
Register Name:
PCI Status
Address Offset:
06h-07h
Power-up value:
0080h
Boot-load:
not used
Attribute:
Read Only (RO), Read/Write Clear
(R/WC)
Size:
16 bits
7
X
0
0
X
X
X
6
X
X
Reserved (RO)
Fast Back-to-Back (RO)
Data Parity Reported (R/WC)
DEVSEL# Timing Status (RO)
0 0 = Fast (S5335)
0 1 = Medium
1 0 = Slow
1 1 = Reserved
Signaled Target Abort (R/WC)
Received Target Abort (R/WC)
Received Master Abort (R/WC)
Signaled System Error (R/WC)
Detected Parity Error (R/WC)
0
15
14
13
12
11
10
9
8
Reserved (RO) = 00's