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S5320 – PCI Match Maker: Signal Description

Revision 5.03 – June 14, 2006

AMCC Confidential and Proprietary

DS1656

Data Sheet

Signal Type Definitions

Note: Tri-State® is a Registered Trademark of National Semiconductor.

The following signal types are taken from the PCI Bus Specification.

Input is a standard input-only signal.

out

Totem Pole Output is a standard active driver.

t/s

Tri-State ®is a bi-directional, tri-state input/output pin.

s/t/s

Sustained Tri-State is an active low tri-state signal owned and driven by one and only one agent at a time. The

agent that drives an s/t/s pin low must drive it high for at least one clock before letting it float. A new agent cannot

start driving an s/t/s signal any sooner than one clock after the previous owner tri-states it. A pull-up is required to

sustain the inactive state until another agent drives it, and must be provided by the central source.

o/d

Open Drain allows multiple devices to share as a wire-OR.

Each signal that assumes the logic low state when asserted is followed by the pound sign (#). Example: TRDY# signal is

asserted low when the target is ready to complete a data transfer. Signals that are not followed by the pound sign are

asserted when they assume the logic high state.

The following designations are used throughout this book when referring to the size of data objects:

A BYTE is an 8-bit object.

A WORD is a 16-bit, or 2-byte object.

A DWORD is a double word and is a 32-bit or 4-byte object.

All hex numbers are followed by an “h”. Examples:

9A4Fh

0110h

All binary numbers are followed by an “b”. Examples:

1010b

0110b

All decimal numbers are followed by an “d”. Examples:

4356d

1101d

CS5320 数据表(PDF) 19 Page - Applied Micro Circuits Corporation

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