S5335 datasheet(80/189 Pages) AMCC

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S5335 – PCI Bus Controller, 3.3V

Revision 5.01 – November 30, 2005

AMCC Confidential and Proprietary

DS1657

Data Sheet

Add-On General Control/status Register (AGCSTS)

This register provides for overall control of the Add-On

portion of this device. It is used to provide a method to

perform software resets of the mailbox and FIFO flags.

The following Add-On controls are provided:

•

Reset PCI to Add-On FIFO flags

•

Reset Add-On to PCI FIFO flags

•

Reset mailbox empty full status flags

•

Write/read external non-volatile memory.

The following status flags are provided to the Add-On:

•

Add-On to PCI FIFO FULL

•

Add-On to PCI FIFO has four or more empty

locations

•

Add-On to PCI FIFO EMPTY

•

PCI to Add-On FIFO FULL

•

PCI to Add-On FIFO has four or more words

loaded

•

PCI to Add-On FIFO EMPTY

Figure 36. Add-On General Control/Status Register

Add-On General Control and

Status

Add-On Address Offset:

3Ch

Power-up value:

000000F4h (PCI initiated bus

mastering) 00000034h (Add-

On initiated bus mastering)

Attribute:

Read/Write, Read Only, Write

Only

Size:

32 bits

292827 2524 23

12 11

765

Bit

Value

FIFO STATUS (RO)

D5=PCI to Add-on FIFO Empty

D4=PCI to Add-on 4+ Spaces

D3=PCI to Add-on FIFO Full

D2=Add-on to PCI FIFO Empty

D1=Add-on to PCI FIFO 4+ Words

D0=Add-on to PCI FIFO Full

16 15

BIST Condition Code (R/W)

Reset Controls

D27=Mailbox Flags

D26=PCI to Add-on FIFO

Status Flags

D25=Add-on to PCI FIFO

Status Flags

nv operation

address/data

nvRAM Access Ctrl

Transfer Count

Enable

D6=Read Transfer Count

Equals Zero (RO)

D7=Write Transfer Count

Equals Zero (RO)

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