XIO2001IPNP datasheet(57/144 Pages) TI

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XIO2001

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SCPS212I – MAY 2009 – REVISED JANUARY 2016

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Table 27. Bridge Control Register Description (continued)

BIT

FIELD NAME

ACCESS

DESCRIPTION

VGA16

VGA 16-bit decode. This bit enables the bridge to provide full 16-bit decoding for VGA I/O

addresses. This bit only has meaning if the VGA enable bit is set.

0 = Ignore address bits [15:10] when decoding VGA I/O addresses (default)

1 = Decode address bits [15:10] when decoding VGA I/O addresses

VGA

VGA enable. This bit modifies the response by the bridge to VGA compatible addresses.

If this bit is set, then the bridge decodes and forwards the following accesses on the

primary interface to the secondary interface (and, conversely, block the forwarding of

these addresses from the secondary to primary interface):

• Memory accesses in the range 000A 0000h to 000B FFFFh

• I/O addresses in the first 64 KB of the I/O address space (address bits [31:16] are

0000h) and where address bits [9:0] are in the range of 3B0h to 3BBh or 3C0h to

3DFh (inclusive of ISA address aliases – address bits [15:10] may possess any

value and are not used in the decoding)

If this bit is set, then forwarding of VGA addresses is independent of the value of bit 2

(ISA), the I/O address and memory address ranges defined by the I/O base and limit

registers, the memory base and limit registers, and the prefetchable memory base and

limit registers of the bridge. The forwarding of VGA addresses is qualified by bits 0

(IO_ENB) and 1 (MEMORY_ENB) in the command register (offset 04h, see Command

0 = Do not forward VGA compatible memory and I/O addresses from the primary to

secondary interface (addresses defined above) unless they are enabled for

forwarding by the defined I/O and memory address ranges (default).

1 = Forward VGA compatible memory and I/O addresses (addresses defined above)

from the primary interface to the secondary interface (if the I/O enable and memory

enable bits are set) independent of the I/O and memory address ranges and

independent of the ISA enable bit.

ISA

ISA enable. This bit modifies the response by the bridge to ISA I/O addresses. This

applies only to I/O addresses that are enabled by the I/O base and I/O limit registers and

are in the first 64 KB of PCI I/O address space (0000 0000h to 0000 FFFFh). If this bit is

set, then the bridge blocks any forwarding from primary to secondary of I/O transactions

addressing the last 768 bytes in each 1-KB block. In the opposite direction (secondary to

primary), I/O transactions are forwarded if they address the last 768 bytes in each 1K

block.

0 = Forward downstream all I/O addresses in the address range defined by the I/O

base and I/O limit registers (default)

1 = Forward upstream ISA I/O addresses in the address range defined by the I/O base

and I/O limit registers that are in the first 64 KB of PCI I/O address space (top 768

bytes of each 1-KB block)

SERR_EN

SERR enable. This bit controls forwarding of system error events from the secondary

interface to the primary interface. The bridge forwards system error events when:

• This bit is set

• Bit 8 (SERR_ENB) in the command register (offset 04h, see Command Register) is

set

• SERR is asserted on the secondary interface

0 = Disable the forwarding of system error events (default)

1 = Enable the forwarding of system error events

PERR_EN

Parity error response enable. Controls the bridge's response to data, uncorrectable

address, and attribute errors on the secondary interface. Also, the bridge always forwards

data with poisoning, from conventional PCI to PCI Express on an uncorrectable

conventional PCI data error, regardless of the setting of this bit.

0 = Ignore uncorrectable address, attribute, and data errors on the secondary interface

(default)

1 = Enable uncorrectable address, attribute, and data error detection and reporting on

the secondary interface

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