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21555 Non-Transparent PCI-to-PCI Bridge User Manual 165
List of Registers
16.6 I2O Registers
This section contains a description of the I2O registers. See Chapter 14 for theory of operation information.
Table 81. I2O Outbound Post_List Status
Byte Offset: 33:30h
Bit Name R/W Description
2:0 Reserved R Reserved. Read only as 0.
3
Outbound
Post Status
R
Reflects the status of the Outbound Post_List.
• When 0, the Outbound Post_List is empty. The 21555 deasserts
p_inta_l (unless it is asserted for other reasons).
• When 1, the Outbound Post_List is not empty. When the Outbound
Post_List Interrupt Mask bit is zero, the 21555 asserts p_inta_l as long
as this status bit is set.
• Reset value is 0
31:4 Reserved R Reserved. Read only as 0.
Table 82. I2O Outbound Post_List Interrupt Mask
Byte Offset: 37:34h
Bit Name R/W Description
2:0 Reserved R Reserved. Read only as 0.
3
Outbound Post
Mask
R/W
Interrupt mask for Outbound Post_List Status.
• When 0, the 21555 asserts p_inta_l when the Outbound
Post_List Status bit is a 1.
• When 1, the 21555 does not assert p_inta_l when the
Outbound Post_List Status bit is a 1.
• Reset value is 1
31:4 Reserved R Reserved. Read only as 0.
Table 83. I2O Inbound Post_List Status
Byte Offset: 3B:38h
Bit Name R/W Description
2:0 Reserved R Reserved. Read only as 0.
3
Inbound Post
Status
R
Reflects the status of the Inbound Post_List.
• When 0, the Inbound Post_List is empty. The 21555 deasserts
s_inta_l (unless it is asserted for other reasons).
• When 1, the Inbound Post_ List is not empty. When the
Inbound Post_List Interrupt Mask bit is zero, the 21555 asserts
s_inta_l as long as this status bit is set.
• Reset value is 0
31:4 Reserved R Reserved. Read only as 0.