SECTION 4
PCI 9080
REGISTERS
PLX Technology, Inc., 1997
Page 56
Version 1.02
4.3.3 (PCISR; PCI:06h, LOC:06h) PCI Status Register
Table 4-12. (PCISR; PCI:06h, LOC:06h) PCI Status Register
Field
Description
Read
Write
Value after Reset
5:0
Reserved.
Yes
No
0
6
If high, supports User Definable Features. This bit can only be written from the local
side. It is read-only from the PCI side.
Yes
Local
0
7
Fast Back-to-Back Capable. When this bit is set to 1, it indicates the adapter can
accept fast back-to-back transactions. Value of 0 indicates adapter cannot.
Yes
No
1
8
Master Data Parity Error Detected. This bit is set to 1 when three conditions are
met: 1) the PCI 9080 asserted PERR# itself or observed PERR# asserted; 2) the
PCI 9080 was the bus master for the operation in which the error occurred; 3) the
Parity Error Response bit in the Command Register is set. Writing 1 to this bit
clears the bit (0).
Yes
Yes/Clr
0
10:9
DEVSEL Timing. Indicates timing for DEVSEL# assertion. Value of 01 indicates a
medium decode.
Note:
Hardcoded to 01.
Yes
No
01
11
Target Abort. When this bit is set to 1, this bit indicates the PCI 9080 has signaled
a target abort. Writing 1 to this bit clears the bit (0).
Yes
Yes/Clr
0
12
Received Target Abort. When set to 1, this bit indicates the PCI 9080 has received
a target abort signal. Writing 1 to this bit clears the bit (0).
Yes
Yes/Clr
0
13
Master Abort. When set to 1, this bit indicates the PCI 9080 has generated a master
abort signal. Writing 1 to this bit clears the bit (0).
Yes
Yes/Clr
0
14
Signaled System Error. When set to 1, this bit indicates the PCI 9080 has reported
a system error on the SERR# signal. Writing 1 to this bit clears the bit (0).
Yes
Yes/Clr
0
15
Detected Parity Error. When set to 1, this bit indicates the PCI 9080 has detected a
PCI bus parity error, even if parity error handling is disabled (the Parity Error
Response bit in the Command Register is clear). One of three conditions can cause
this bit to be set. 1) the PCI 9080 detected a parity error during a PCI address
phase; 2) the PCI 9080 detected a data parity error when it was the target of a
write; 3) the PCI 9080 detected a data parity error when performing a master read
operation. Writing 1 to this bit clears the bit (0).
Yes
Yes/Clr
0
4.3.4 (PCIREV; PCI:08h, LOC:08h) PCI Revision ID Register
Table 4-13. (PCIREV; PCI:08h, LOC:08h) PCI Revision ID Register
Field
Description
Read
Write
Value after Reset
7:0
Revision ID. Silicon revision of PCI 9080.
Yes
Local/
Serial
EEPROM
Current Rev #