Sundance Spas ST201 - Manual (Page 109)

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Sundance Technology ST201 PRELIMINARY draft 2
CONFIGSTATUS
Class....................PCI Configuration Registers, Configuration
Base Address ......PCI device configuration header start
Address Offset .....0x06
Access Mode .......Read/Write
Width ...................16 bits
This register is used to record status information for PCI bus events. Read/write bits in the register can
only be reset, not set, by writing to this register. Bits are reset by writing a one to that bit position.
BIT BIT NAME BIT DESCRIPTION
3..0 Reserved Reserved for future use. Should be set to 0.
4 Capabilities This read-only bit is always set, indicating the existence of a list of
extended capabilities registers. The CapPtr register points to the start
of the list.
6..5 Reserved Reserved for future use. Should be set to 0.
7 FastBackToBack This read-only bit, when set, indicates that the adapter, as a Target,
supports fast back-to-back transactions as defined by the criteria in the
section 3.4.2 of the PCI specification.
8 DataParityRe-
ported The adapter sets this bit when, as a master, it detects the PERRN sig-
nal asserted, and the ParityErrorResponse bit is set in the ConfigCom-
mand register.
10..9 DevselTiming This read-only field is used to encode the slowest time with which the
adapter asserts the DEVSELN signal. ST201-based adapters return
01b, indicating that they support “medium” speed DEVSELN assertion.
11 SignaledTargetA-
bort The adapter sets this bit when it terminates a bus transaction with tar-
get-abort.
12 ReceivedTargetA-
bort The adapter sets this bit when, operating as a bus master, its bus
transaction is terminated with target-abort.
13 ReceivedMaster-
Abort The adapter sets this bit when, operating as a bus master, its bus
transaction is terminated with master-abort.
14 SignaledSystemEr-
ror This bit is set whenever the adapter asserts SERRN.
15 DetectedParityEr-
ror The adapter sets this bit when it detects a parity error, regardless of
whether parity error handling is enabled.