
Datasheet
iii
Contents
Contents
1.0
Introduction
....................................................................................................................................5
1.1
Comparing 21555 and Standard PCI-to-PCI Bridge.............................................................5
1.2
Architectural Overview..........................................................................................................8
2.0
Pin Assignment
...........................................................................................................................10
2.1
Pin Location List (Alphanumeric)........................................................................................12
2.2
Pin Signal List (Alphanumeric)............................................................................................17
3.0
Electrical Specifications
.............................................................................................................22
3.1
PCI Electrical Specification Conformance ..........................................................................22
3.2
Absolute Maximum Ratings................................................................................................22
3.3
DC Specifications ...............................................................................................................23
3.4
AC Timing Specifications....................................................................................................23
3.4.1
Clock Timing Specifications...................................................................................23
3.4.2
PCI Signal Timing Specifications...........................................................................25
3.4.3
Reset Timing Specifications ..................................................................................26
3.4.4
Serial ROM Timing Specifications .........................................................................27
3.4.5
Parallel ROM Timing Specifications.......................................................................27
3.4.6
JTAG Timing Specifications...................................................................................28
4.0
Mechanical Specifications
..........................................................................................................29
Figures
1
2
3
4
5
6
Tables
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
21555 Intelligent Controller Application........................................................................................6
21555 Microarchitecture...............................................................................................................9
21555 PBGA Cavity Down View.................................................................................................11
PCI Clock Signal AC Parameter Measurements........................................................................25
PCI Signal Timing Measurement Conditions..............................................................................25
304 PBGA (Four-Layer) Package...............................................................................................29
21555 and PPB Feature Comparison...........................................................................................7
Signal Type Abbreviations..........................................................................................................10
21555 Pin Location List (Alphanumeric).....................................................................................12
21555 Pin Signal List (Alphanumeric).........................................................................................17
Absolute Maximum Ratings........................................................................................................22
Functional Operating Range.......................................................................................................22
DC Parameters...........................................................................................................................23
33 MHz PCI Clock Signal AC Parameters..................................................................................24
66 MHz PCI Clock Signal AC Parameters..................................................................................24
33 MHz PCI Signal Timing Specifications ..................................................................................26
66 MHz PCI Signal Timing Specifications ..................................................................................26
Reset Timing Specifications .......................................................................................................26
Serial ROM Timing Specifications..............................................................................................27
Parallel ROM Timing Specifications ...........................................................................................27
JTAG Timing Specifications........................................................................................................28