CS5920 datasheet(23/160 Pages) AMCC

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S5920 – PCI Product

Revision 1.01 – November 28, 2005

AMCC Confidential and Proprietary

DS1596

Data Book

ARCHITECTURAL OVERVIEW S5920

Since the S5920 is a PCI Target or Slave device only,

its cost is significantly less than PCI Bus Master solu-

tions. The S5920 is PCI purposed 2.2 compliant and

can support data transfer rates up to 132 Mbytes/sec.

Burst transfers and single data transfers are both sup-

ported. Figure 1 shows the block diagram for the

S5920.

Many additional S5920 features offer the user easier

hardware and software implementation. Up to four

memory or I/O size definable blocks, referred to as

Pass-Thru‘ regions, are provided for multiple device

configurations. Data transfers via a Pass-Thru region

can be performed either direct to the Add-On bus or

through two 32-Byte burstable FIFOs. Added read

prefetch and programmable FIFO wait state features

allow the user to tune system performance. The Pass-

Thru data channel also supports an active/passive

mode bus interface. Passive mode requires the

designer to transfer data by externally driving the Add-

On bus. Active mode minimizes design components

by enabling internal logic to drive or acquire the Add-

On bus to read or write data independently. Active

mode provides programmable wait state generation

for slower Add-On designs.

Two 32-bit mailbox registers are implemented for addi-

tional data or user-defined status/command transfers.

Each mailbox may be examined for empty or full, at

the byte level, through a mailbox status register. Mail-

box transfers can be either register style or hardware

direct. Dedicated external mailbox data and strobe

pins are provided for direct hardware read/writes and

allow Add-On to PCI interrupt capabilities. A direct

Add-On to a PCI bus interrupt pin is incorporated, add-

ing design flexibility.

The S5920 supports a two-wire serial nvRAM. This

allows the designer to customize the device configura-

tion to be loaded during power-up initialization. An

expansion BIOS may also be contained in the nvRAM.

S5920 REGISTER ARCHITECTURE

S5920 communications, control and configuration is

performed through three primary groups of registers:

PCI Configuration Registers, PCI Operation Registers

and Add-On Operation Registers. All of these registers

are user configurable through their associated buses

and from the external nvRAM. The following sections

provide a brief overview of each register group and the

nvRAM interface.

PCI Configuration Registers

All PCI compliant devices are required to provide a

group of PCI configuration registers. These registers

are polled by the host BIOS system during power-up

initialization. They contain specific device and product

information such as Vendor ID, Device ID, Subsystem

Vendor ID, memory requirements, etc. These registers

are located in the S5920 and are either initialized with

predefined default values or user customized defini-

tions contained in the external nvRAM.

PCI Bus Accessible Registers

The second group of registers are the PCI Operation

Registers. This group of registers is accessible to the

PCI Bus. These are the primary registers through

which the PCI Host configures the S5920 operation

and communicates with the Add-On Bus. These regis-

ters encompass the PCI bus mailboxes, Pass-Thru/

FIFO data channel and Status/ Control registers.

Add-On Bus Accessible Registers

The last register group consists of the Add-On Opera-

tion Registers. This group of registers is accessible via

the Add-On Bus. These are the primary registers

through which the Add-On application configures

S5920 operation and communicates with the PCI Bus.

These registers encompass the Add-On bus mail-

boxes, Pass-Thru/FIFO Registers and Status/Control

Registers.

SERIAL NON-VOLATILE INTERFACE

Previously indicated, the S5920 contains the required

set of PCI Configuration Registers. These registers

can be initialized with default values or with custom-

ized values contained in an external nvRAM. The

nvRAM allows Add-On card manufacturers to initialize

the S5920 with their specific Vendor ID values, along

with other desired S5920 operation characteristics.

CS5920 Datasheet(PDF) 23 Page - Applied Micro Circuits Corporation

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