Texas Memory Systems XP-15 manual Echo

3	ECHO	RO	Indicates the XP-15 has returned an ECHO packet
2	SPR	RO	Indicates the XP-15 has returned an SPR packet
1	DIAG	RO	Indicates the XP-15 has returned a diagnostic packet
0	STAT	RO	Indicates the XP-15 has returned a status packet
	Low PCI SN command address register (32 bits, R/W)
Bit #	Name	Type	Description
31-3	NA	R/W	This register is used to establish the low 32-bits of the PCI
			address for SN commands to the XP-15. This register consists
			of the bottom 32-bits of a 32-bit counter with the low-order
			three bits hardwired to zeroes. Transfers must begin on a
			Double DWORD (64-bit) boundary.
2-0	Reserved	RO	These bits are reserved (must be written with zeroes).
	High PCI SN command address register (32 bits, R/W)
Bit #	Name	Type	Description
63-32	NA	R/W	Upper bits of this register are not used.

Low PCI SN response address register (32 bits, R/W)

Bit #	Name	Type	Description
31-3	NA	R/W	This register is used to establish the low 32-bits of the PCI
			address for SN responses from the XP-15. This register
			consists of the bottom 32-bits of a 32-bit counter with the low-
			order three bits hardwired to zeroes. Transfers must begin
			on a Double DWORD (64-bit) boundary.
2-0	Reserved	RO	These bits are reserved (must be written with zeroes).

High PCI SN response address register (32 bits, R/W)

Bit #	Name	Type	Description
63-32	NA	R/W	Upper bits of this register are not used.

PCI200 User Guide Texas Memory Systems, Inc. (8/6/01) C-2