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2.3

Documents Conventions

2.4

Document History

2.5

Ordering Information

2.6

Terminal Assignments

XIO2001 PCI Express™ to PCI Bus Translation Bridge

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SCPS212B – MAY 2009 – REVISED JULY 2009

Throughout this data manual, several conventions are used to convey information. These conventions are

listed below:

1. To identify a binary number or field, a lower case b follows the numbers. For example: 000b is a 3-bit

binary field.

2. To identify a hexadecimal number or field, a lower case h follows the numbers. For example: 8AFh is a

12-bit hexadecimal field.

3. All other numbers that appear in this document that do not have either a b or h following the number

are assumed to be decimal format.

4. If the signal or terminal name has a bar above the name (for example, GRST), then this indicates the

logical NOT function. When asserted, this signal is a logic low, 0, or 0b.

5. Differential signal names end with P, N, +, or – designators. The P or + designators signify the positive

signal associated with the differential pair. The N or – designators signify the negative signal

associated with the differential pair.

6. RSVD indicates that the referenced item is reserved.

7. In Sections 4 through 6, the configuration space for the bridge is defined. For each register bit, the

software access method is identified in an access column. The legend for this access column includes

the following entries:

–

r – read access by software

–

u – updates by the bridge internal hardware

–

w – write access by software

–

c – clear an asserted bit with a write-back of 1b by software. Write of zero to the field has no effect

–

s – the field may be set by a write of one. Write of zero to the field has no effect

–

na – not accessible or not applicable

REVISION

REVISION COMMENTS

DATE

NUMBER

5/2009

–

Initial release

5/2009

Corrected typos in Table 2-1 and Table 2-2

ORDERING

NAME

VOLTAGE

PACKAGE

NUMBER

3.3-V and 5.0-V tolerant PCI bus I/Os

169-terminal ZGU (Lead-Free) Microstar

XIO2001

PCI-Express to PCI Bridge

with 3.3-V and 1.5-V power terminals

PBGA

3.3-V and 5.0-V tolerant PCI bus I/Os

144-terminal ZAJ (Lead-Free) MicroStar

XIO2001

PCI-Express to PCI Bridge

with 3.3-V and 1.5-V power terminals

PBGA

The XIO2001 is available in either a 169-ball ZGU MicroStar BGA or a 144–ball ZAJ MicroStar BGA

package.

Figure 2-1 shows a terminal diagram of the ZGU package, and Table 2-1 lists the ZGU terminals sorted

alphanumerically.

Figure 2-2 shows a terminal diagram of the ZAJ package, and Table 2-2 lists the ZAJ package terminals

sorted alphanumerically.

Table 2-3 shows the terminals by the alphabetically sorted signal names for both packages.

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