LSI LSI53C895A, Technical Manual

Page: 113 / 364

PCI Configuration Registers 4-5
EIS Enable I/O Space 0
This bit controls the LSI53C895A response to I/O space
accesses. A value of zero disables the device response.
A value of one allows the LSI53C895A to respond to I/O
Space accesses at the address range specified by the
Base Address Register Zero (I/O) register in the PCI
configuration space.
Registers: 0x06–0x07
Status
Read/Write
Reads to this register behave normally. Writes are slightly different in that
bits can be cleared, but not set. A bit is cleared whenever the register is
written, and the data in the corresponding bit location is a one. For
instance, to clear bit 15 and not affect any other bits, write the value
0x8000 to the register.
DPE Detected Parity Error (from Slave) 15
This bit is set by the LSI53C895A whenever it detects a
data parity error, even if data parity error handling is
disabled.
SSE Signaled System Error 14
This bit is set whenever the device asserts the SERR/
signal.
RMA Received Master Abort (from Master) 13
A master device should set this bit whenever its
transaction (except for Special Cycle) is terminated with
Master Abort.
RTA Received Target Abort (from Master) 12
A master device should set this bit whenever its
transaction is terminated by target abort.
15 14 13 12 11 10 9 8 7 5 4 3 0
DPE SSE RMA RTA R DT[1:0] DPR R NC R
0 0 0 0 x 0 1 0 x x x 1 x x x x