PI7C9X110 Pericom Semiconductor Corporation, PI7C9X110 Datasheet - Page 97

• Manufacturer Part Number: PI7C9X110
• Description: Pcie-to-pci Reversible Bridge
• Manufacturer: Pericom Semiconductor Corporation

7.5.49 GPIO DATA AND CONTROL REGISTER – OFFSET 78h
7.5.50 SECONDARY INTERRUPT LINE REGISTER – OFFSET 7Ch
7.5.51 SECONDARY INTERRUPT PIN REGISTER – OFFSET 7Ch
7.5.52 SECONDARY MINIMUM GRANT REGISTER – OFFSET 7Ch
Pericom Semiconductor
BIT
9
10
11
BIT
15:12
19:16
23:20
27:24
31:28
BIT
7:0
BIT
15:8
BIT
23:16
FUNCTION
Secondary Master Timeout
Master Timeout Status
Discard Timer SERR_L
Enable
FUNCTION
GPIO Output Write-1-to-
Clear
GPIO Output Write-1-to-Set
GPIO Output Enable Write-
1-to-Clear
GPIO Output Enable Write-
1-to-Set
GPIO Input Data Register
FUNCTION
Secondary Interrupt Line
FUNCTION
Secondary Interrupt Pin
FUNCTION
Secondary Minimum Grant
TYPE
TYPE
TYPE
TYPE
TYPE
RWC
RW
RW
RW
RW
RW
RW
RW
RO
RO
RO
Page 97 of 145
DESCRIPTION
0: Secondary discard timer counts 215 PCI clock cycles
1: Secondary discard timer counts 210 PCI clock cycles
REVERSE BRIDGE – Bit is RO and ignored by PI7C9X110
Reset to 0
Bit is set when the discard timer expires and a delayed completion is
discarded at the PCI interface for the forward or reverse bridge
Reset to 0
Bit is set to enable to generate ERR_NONFATAL or ERR_FATAL for
forward bridge, or assert SERR_L for reverse bridge as a result of the
expiration of the discard timer. It has no meaning if PI7C9X110 is in PCI-X
mode.
Reset to 0
DESCRIPTION
Reset to 0h
Reset to 0h
Reset to 0h
Reset to 0h
Reset to 0h
DESCRIPTION
These bits apply to forward bridge only.
For initialization code to program to tell which input of the interrupt
controller the bridge’s INTA_L in connected to.
Reset to 00000000
DESCRIPTION
These bits apply to forward bridge only.
00000001: Designates interrupt pin INTA_L is used
Reset to 00h when reverse mode or 01h when forward mode.
DESCRIPTION
This register is valid only in forward bridge mode. It specifies how long of a
burst period that PI7C9X110 needs on the secondary bus in the units of ¼
microseconds.
Reset to 0
May 2008, Revision 2.6
PCIe-to-PCI Reversible Bridge
PI7C9X110