Revision 1.02 – June 27, 2006
S5935 – PCI Product
Data Book
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
4 as (R/WC). Those which are Read Only are shown
as (RO) in Figure 4.
PCI STATUS REGISTER (PCISTS)
PCI Status
Register Name
06h-07h
Address Offset
0080h
Power-up value
not used
Boot-load
Read Only (RO), Read/Write Clear
(R/WC)
Attribute
16 bits
Size
Figure 11. PCI Status Register
15
X
14 13 12 11 10
9
0
8
70 6
X
X
X
X
0
X
0
Reserved (RO) = 00's
Reserved (RO)
Fast Back-to-Back (RO)
Data Parity Reported (R/WC)
DEVSEL# Timing Status (RO)
0 0 = Fast (S5933)
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)
38
DS1527
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