Altera HyperTransport MegaCore Function - Manual (Page 68)

A–2 Appendix A: Parameters
Parameter Lists
HyperTransport MegaCore Function User Guide © November 2009 Altera Corporation
Preliminary
Base Address Registers
Table A–2 lists the parameters modified by settings on the Base Address Registers tab
of the IP Toolbench wizard.
Table A–2. BAR Parameters
Parameter Default
Available
Setting(s) Description
Bar0AndMask 0xFFF0_0000 Any 32-bit value The AndMask defines the writable bits of the specified BAR.
For 32 bit memory space BARs, only bits 31-10 can be
writable, i.e., the minimum decodable memory space is
1KBytes. Only BAR1, BAR3, and BAR5 can be the upper BARs
of a 64 bit BAR. In this case, all bits can be writable.
Bar1AndMask 0x0 Any 32-bit value
Bar2AndMask 0x0 Any 32-bit value
Bar3AndMask 0x0 Any 32-bit value
Bar4AndMask 0x0 Any 32-bit value
Bar5AndMask 0x0 Any 32-bit value
Bar0MatchMask 0xFFF0_0000 Any 32-bit value The MatchMask specifies which bits of the specified BAR
should be used for matching addresses. In all cases, the
MatchMask should be identical to the AndMask.
Bar1MatchMask 0x0 Any 32-bit value
Bar2MatchMask 0x0 Any 32 -bit value
Bar3MatchMask 0x0 Any 32-bit value
Bar4MatchMask 0x0 Any 32-bit value
Bar5MatchMask 0x0 Any 32-bit value
Bar0OrMask 0x8 Any 4-bit value The OrMask specifies which low-order type bits of the BAR
should be set to 1.
■ Bit[0] – I/O space
■ Bit[1] – Reserved
■ Bit[2] – 64 bit BAR (only valid on BAR0, BAR2, and BAR4)
Only valid when Bit [0]=0
■ Bit[3] – Prefetchable
On the upper BAR of a 64 bit BAR, all of these bits must be 0.
Bar1OrMask 0x0 Any 4-bit value
Bar2OrMask 0x0 Any 4-bit value
Bar3OrMask 0x0 Any 4-bit value
Bar4OrMask 0x0 Any 4-bit value
Bar5OrMask 0x0 Any 4-bit value
CLAIM_COMPAT 0x0 0 or 1 Compatibility Request Claiming occurs based on whether the
CLAIM_COMPAT parameter is set to zero or 1. When the value
of this parameter is zero, the HyperTransport MegaCore
function does not claim Read and Write requests that have the
Compat bit set to 1, posted requests are ignored and
nonposted requests have a NXA error response returned.
When the CLAIM_COMPAT parameter is set to the value 1, the
requests are claimed and presented on the Rx user interfaces
of the function. Setting the value to 1 can be used to
implement an x86 Subtractive Decode device. The
CLAIM_COMPAT parameter is set by the Claim All Read And
Write Requests With Compat Bit Equal To '1' box on the Base
Address Registers tab.