s5920 Applied Micro Circuits Corporation (AMCC), s5920 Datasheet - Page 89

• Manufacturer Part Number: s5920
• Description: Pci Product
• Manufacturer: Applied Micro Circuits Corporation (AMCC)

S5920 – PCI Product: Operation Registers
ADD-ON PASS-THRU CONFIGURATION
REGISTER (APTCR)
Figure 35. Pass-Thru Configuration Register
AMCC Confidential and Proprietary
Register Name:
Add-On Address:
Power-up value:
Add-On Attribute:
Size:
31
Region 4
Pass-Thru Configuration Register
60h
80808080h
Read/Write
32 bits
D6 Endian Conversion
0 - No Conversion
1 - Big Endian Conversion
24
D7 Pass-Thru Mode
0 - PTADR# Not Driven
1 - PTADR# Driven
23
Region 3
D5 Write FIFO
0 - Enabled
1 - Disabled
16
15
This register controls the configuration for Pass-Thru
Regions 1-4.
Byte 0 Controls Pass-Thru Region 1
Byte 1 Controls Pass-Thru Region 2
Byte 2 Controls Pass-Thru Region 3
Byte 3 Controls Pass-Thru Region 4
IMPORTANT NOTE: This register (APTCR) is physi-
cally the same as the PCI Pass-Thru configuration
register (PTCR). It is intended that either the PCI sys-
tem or local Add-On interface will write to this register,
but not both. However, in the event that both the PCI
and Add-On write to this register, whichever side wrote
last wins. This register is also intended to be initialized
once, prior to any PCI bus operations. Pass-Thru
operation cannot be guaranteed if this register is
updated while a Pass-Thru transaction is being
performed.
Region 2
8
7
Revision 1.02 – April 12, 2007
Prefetch
D4 D3
00 - Disabled
01 - Small
10 - Medium
11 - Large
Active Mode Wait States
D2 D1 D0
000 - 0 Wait States
001 - 1 Wait States
010 - 2 Wait States
011 - 3 Wait States
100 - 4 Wait States
101 - 5 Wait States
110 - 6 Wait States
111 - 7 Wait States
Region 1
Data Book
DS1596
0
89