I2O Outbound Post_List Counter; I2O Outbound Free_List Counter - Intel 21555 User Manual

Table 93. I2O Outbound Post_List Counter
Byte Offsets: 063:060h
Bit
15:0
30:16
31
Table 94. I2O Outbound Free_List Counter
Byte Offsets: 067:064h
Bit
15:0
30:16
31
21555 Non-Transparent PCI-to-PCI Bridge User Manual
Name R/W
Outbound Post Ctr R/(WS)
Reserved R
LD_OPC W1TL(S)
Name R/W
Outbound Free Ctr R/(WS)
Reserved R
LD_OPC W1TL(S)
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.
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
Reserved. Read only as 0.
Load Outbound Post_List Counter.
When written with a 1 at the same time as the Outbound Post
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.
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
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
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
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.
List of Registers
169