Specifications
XIO3130
www.ti.com
SLLS693F–MAY 2007–REVISED JANUARY 2010
Table 4-25. Bit Descriptions – Device Capabilities Register
BIT FIELD NAME ACCESS DESCRIPTION
31:28 RSVD r Reserved. When read, these bits return zeros.
Captured slot power limit scale. The value in this register is programmed by the host by issuing
a Set_Slot_Power_Limit Message. When a Set_Slot_Power_Limit Message is received, bits 9:8
are written to this field. The value in this register specifies the scale used for the Slot Power
Limit.
27:26 CSPLS ru
00 – 1.0x
01 – 0.1x
10 – 0.01x
11 – 0.001x
Captured slot power limit value. The value in this register is programmed by the host by issuing
a Set_Slot_Power_Limit Message. When a Set_Slot_Power_Limit Message is received, bits 7:0
25:18 CSPLV ru are written to this field. The value in this register, in combination with the Slot power limit scale
value, specifies the upper limit of power supplied to the slot. The power limit is calculated by
multiplying the value in this field by the value in the Slot power limit scale field.
17:16 RSVD r Reserved. When read, these bits return zeros.
Role-based error reporting. This field is set to 1b to indicate support for role-based error
15 RBER r
reporting.
14:6 RSVD r Reserved. When read, these bits return zeros.
Extended tag field supported. This field indicates the size of the tag field supported. This bit is
5 ETFS r
hardwired to zero, indicating support for 5-bit tag fields.
Phantom functions supported. This field is read-only 00b, indicating that function numbers are
4:3 PFS r
not used for phantom functions.
Max payload size supported. This field indicates the maximum payload size that the device can
2:0 MPSS r support for TLPs. This field is encoded as 001b, which indicates that the maximum payload size
for a TLP is 256 bytes.
4.2.50 Device Control Register
The Device Control register controls PCI Express device-specific parameters.
PCI register offset: 98h
Register type: Read/Write; Read Only
Default value: 2000h
BIT NUMBER 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RESET STATE 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0
Table 4-26. Bit Descriptions – Device Control Register
BIT FIELD NAME ACCESS DESCRIPTION
15 RSVD r Reserved. When read, this bit returns zero.
Max read request size. This field is programmed by the host software to set the maximum size
of a read request that the XIO3130 can generate. The XIO3130 uses this field in conjunction
with the cache line size register to determine how much data to fetch on a read request. This
field is encoded as:
000 – 128B
001 – 256B
14:12 MRRS rw
010 – 512B
011 – 1024B
100 – 2048B
101 – 4096B
110 – Reserved
111 – Reserved
Copyright © 2007–2010, Texas Instruments Incorporated XIO3130 Configuration Register Space 55
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