Intel 21555 user manual I2O Outbound PostList Counter, I2O Outbound FreeList Counter, Ldopc W1TLS

List of Registers

Table 93. I2O Outbound Post_List Counter

Byte Offsets: 063:060h

Bit	Name	R/W	Description
			When read, returns the number of entries in the Outbound
			Post_List.
			Increments by 1 when this location is written from the
			secondary interface with any data value if bit [31] of this register
			is written with a 0 during the same write.
15:0	Outbound Post Ctr	R/(WS)	When bit [31] is written with a 1, the 21555 loads the counter
			with the value written.
			Decrements when the Outbound Queue at offset 44h is read
			from the primary interface, except when the counter is zero. The
			21555 does not decrement when the counter is 0.
			Reset value is 0
30:16	Reserved	R	Reserved. Read only as 0.
			Load Outbound Post_List Counter.
			When written with a 1 at the same time as the Outbound Post
31	LD_OPC	W1TL(S)	Ctr bits [15:0], it loads the Outbound Post_List Counter with the
			value on s_ad[15:0] during that same write.
			When written with a 0, or if s_cbe_l[3] is 1, it increments the
			Outbound Post_List Counter. Reads always return 0.

Table 94. I2O Outbound Free_List Counter

Byte Offsets: 067:064h

Bit	Name	R/W	Description
			When read, returns the number of entries in the Outbound
			Free_List.
			Decrements by 1 when this location is written from the
			secondary interface with any data value when bit [31] of this
15:0	Outbound Free Ctr	R/(WS)	register is written with a 0 during the same write.
			When bit [31] is written with a 1, the 21555 loads the counter
			with the value written.
			Increments when the Outbound Queue at offset 44h is written
			from the primary interface.
			Reset value is 0
30:16	Reserved	R	Reserved. Read only as 0.
			Load Outbound Free_List Counter.
			• When written with a 1 at the same time as the Outbound
			Free Ctr bits [15:0], it loads the Outbound Free_List
31	LD_OPC	W1TL(S)	Counter with the value on s_ad[15:0] during that same
			write.
			• When written with a 0, or if s_cbe_l[3] is 1, it decrements
			the Outbound Free_List Counter. Reads always return 0.

21555 Non-Transparent PCI-to-PCI Bridge User Manual 169