Specifications

17 January 1997 – Subject to Change
I/O Space Address Maps B–15
PCI Special/Interrupt Acknowledge Cycle Address Space
B.5 PCI Special/Interrupt Acknowledge Cycle Address Space
This space occupies physical addresses 87.2000.0000 through 87.3FFF.FFFF. Refer
to Section A.3.4.2 for additional information on this address space.
B.6 Hardware-Specific and Miscellaneous Register Space
This space occupies physical addresses 87.4000.0000 through 87.6FFF.FFFF and
covers the 21172-CA (CIA) address space. Registers accessed in this space use a
hardware-specific variant of sparse space encoding. CPU address bits <27:6> are
used as a longword address. CPU address bits <5:0> must be zero. All CIA registers
are accessed with longword granularity.
B.6.1 CIA Main CSR Space
This space occupies physical addresses 87.4000.0000 through 87.4FFF.FFFF. Table
B–11 lists all the CIA chip’s general control, diagnostic, and error registers.
Table B–11 CIA Control, Diagnostic, and Error Registers
Register Type Address Description
General Registers
CIA_REV RO 87.4000.0080 CIA revision register
PCI_LAT RO 87.4000.00C0 PCI latency register
CIA_CTRL RW 87.4000.0100 CIA control register
CIA_CNFG RO 87.4000.0140 CIA configuration register
HAE_MEM RW 87.4000.0400 Hardware address extension register
HAE_IO RW 87.4000.0440 Hardware address extension I/O register
CFG RW 87.4000.0480 PCI configuration register
CACK_EN RW 87.4000.0600 CIA acknowledgment enable register
Diagnostic Registers
CIA_DIAG RW 87.4000.2000 CIA diagnostic control register
DIAG_CHECK RW 87.4000.3000 Diagnostic check register