Intel CONTROLLERS 413808 - Manual (Page 226)

Intel
®
413808 and 413812—Address Translation Unit (PCI-X)
Intel ® 413808 and 413812 I/O Controllers in TPER Mode
Developer’s Manual October 2007
226 Order Number: 317805-001US
2.14.88 PCIX RCOMP Control Register — PRCR
Warning:
In Central Resource mode this register can only be accessed when PCSR bit 21 is
cleared. Refer to Table 68, “PCI Configuration and Status Register - PCSR” on
page 178 .
Table 115. PCIX RCOMP Control Register - PRCR
Bit Default Description
31:12 00000H Reserved
11 0
2
When this bit is set, the slew rate manual override values are used. When this bit is cleared, the slew
rate is derived from the drive strength (normal operation).
10:09 00
2
Reference select for PCIX CAP pad
2'b00 Nominal Reference Voltage
2'b01 -5% Reference
2'b10 +5% Reference
08:07 01
2
Drive strength select for ODT RCOMP pad
2'b00 103.0 ohms
2'b01 110.0 ohms
2'b10 120.0 ohms
06:04 010
2
Drive strength select for RCOMP pad dedicated 3.3V supply voltage
3'b000 18.0 ohms
3'b001 20.1 ohms
3'b010 22.0 ohms
3'b011 24.1 ohms
3'b100 26.1 ohms
03:01 001
2
Drive strength select for RCOMP pad 1.5V switch supply voltage
3'b000 18.0 ohms
3'b001 20.1 ohms
3'b010 22.0 ohms
3'b011 24.1 ohms
3'b100 26.1 ohms
00 1
2
RCOMP pads enable.
PCI
IOP
Attributes
Attributes
28 24 20 16 12 8 4 0 31
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rv
na
rw
na
rw
na
rw
na
rw
na
rw
na
rw
na
rw
na
rw
na
rw
na
rw
na
rw
na
rw
na
Attribute Legend:
RV = Reserved
PR = Preserved
RS = Read/Set
RW = Read/Write
RC = Read Clear
RO = Read Only
NA = Not Accessible
Intel XScale ® processor Local Bus
offset
+2100H