Altera HyperTransport MegaCore Function - Manual (Page 59)

Chapter 3: Specifications 3–33
HyperTransport MegaCore Function Specification
© November 2009 Altera Corporation HyperTransport MegaCore Function User Guide
Preliminary
PCI Status Register (Offset 0x06)
Table 3–15 describes the PCI status register.
Revision ID, Class Code (Offset 0x08)
The revision ID and class code are read-only as defined in the PCI specification. They
are parameters in the HyperTransport MegaCore function.
Header Type (Offset 0x0E)
The header type is read-only as defined in the PCI specification. The default is 0.
Base Address Registers (Offsets 0x10, 0x14, 0x18, 0x1C, 0x20, 0x24)
The HT BAR definition is similar to the PCI specification’s BAR definition. The
incoming address is first compared to the I/O address map to determine if it is in the
memory range or the I/O range. For memory ranges, the BAR can be either 64 or 32
bits. If the BAR is 64 bits, the incoming address must be zero-extended to 64-bits
before being compared to the BAR value. All 6 BARs are supported with up to 3 64-bit
BARs or up to 6 32-bit BARs. The only valid 64-bit BAR pairs are:
■ BAR0 and BAR1
■ BAR2 and BAR3
■ BAR4 and BAR5
8 SERR# Enable R/W Warm If set, the device floods all outgoing links with sync packets.
15:
9
Reserved
Table 3–14. PCI Command Register (Offset 0x04) (Part 2 of 2)
Bits Name
Register
Type
Reset
Used Description
Table 3–15. PCI Status Register (Offset 0x06)
Bits Name
Register
Type
Reset
Used Description
3:0 Reserved
4 Capabilities List R/O N/A Hardwired to 1 to indicate that there is a capabilities list present.
10:5 Reserved
11 Signaled Target Abort R/C Cold Set by device when a response with non-NXA error occurs
(generated response with non-NXA error).
12 Received Target Abort R/C Cold Indicates that the device received a target abort (received response
with non-NXA error).
13 Received Master Abort R/C Cold Indicates that the device has received a master abort (received
response with NXA set).
14 Signaled System Error R/C Cold Set by the device to indicate that it has signaled SERR (generated
sync flood).
15 Reserved