s5920 Applied Micro Circuits Corporation (AMCC), s5920 Datasheet - Page 79

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

S5920 – PCI Product: Operation Registers
PCI PASS-THRU CONFIGURATION REGIS-
TER (PTCR)
Figure 31. Pass-Thru Configuration Register
AMCC Confidential and Proprietary
Register Name:
PCI Address Offset:
Power-up value:
PCI 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 (PTCR) is physi-
c a l l y t h e s a m e a s t h e A d d - O n P a s s - T h r u
Configuration Register (APTCR). It is intended that
either the PCI system or local Add-On interface will
write to this register, but not both. However, in the
event that both the PCI and Add-On must write to this
register, whichever side wrote last will update its value.
Also, Pass-Thru operation cannot be guaranteed if this
register is updated while a Pass-Thru operation is
already in progress.
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
0
DS1596
79