Intel 21555 I2O Inbound PostList Counter, I2O Inbound FreeList Counter, Ldipc W1TLS, Ldifc W1TLS

List of Registers

Table 91. I2O Inbound Post_List Counter

Byte Offsets: 05B:058h

Bit	Name	R/W	Description
			When read, returns the number of entries in the Inbound
			Post_List.
			Decrements by 1 when this location is written from the
			secondary interface with any data value if bit [31] of this register
15:0	Inbound Post Ctr	R/(WS)	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 Inbound Queue at offset 40h is written
			from the primary interface.
			Reset value : 0
30:16	Reserved	R	Reserved. Read only as 0.
			Load Inbound Post_List Counter.
			• When written with a 1 at the same time as the Inbound Post
31	LD_IPC	W1TL(S)	Car bits [15:0], it loads the Inbound 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, decrements the
			Inbound Post_List Counter. Reads always return 0.

Table 92. I2O Inbound Free_List Counter

Byte Offsets: 05F:05Ch.

Bit	Name	R/W	Description
			When read, returns the number of entries in the Inbound
			Free_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	Inbound Free Ctr	R/(WS)	When bit [31] is written with a 1, the 21555 loads the counter
			with the value written.
			Decrements when the Inbound Queue at offset 40h 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 Inbound Free_List Counter.
			• When written with a 1 at the same time as the Inbound Free
31	LD_IFC	W1TL(S)	Ctr bits [15:0], loads the Inbound Free_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, increments the
			Inbound Free_List Counter. Reads always return 0.

168 21555 Non-Transparent PCI-to-PCI Bridge User Manual