
Bits Field Description
[15]
PME_status
When set to 1, indicates that the function would normally assert
the PME# message independently of the state of the PME_en bit.
[14:13]
data_scale
This field indicates the scaling factor when interpreting the value
retrieved from the data register. This field is read-only.
[12:9]
data_select
This field indicates which data should be reported through the
data register and the data_scale field.
[8]
PME_EN
1: indicates that the function can assert PME#0: indicates that the
function cannot assert PME#
[7:2]
reserved
—
[1:0]
PM_state
Specifies the power management state of the operating condition
being described. The following encodings are defined:
• 2b’00 D0
• 2b’01 D1
• 2b’10 D2
• 2b’11 D3
A device returns 2b’11 in this field and Aux or PME Aux in the
type register to specify the D3-Cold PM state. An encoding of
2b’11 along with any other type register value specifies the D3-
Hot state.
Figure 4-34: pme_to_sr and pme_to_cr in an Endpoint IP core
The following figure illustrates the behavior of pme_to_sr and pme_to_cr in an Endpoint. First, the Hard
IP receives the PME_turn_off message which causes pme_to_sr to assert. Then, the Application Layer
sends the PME_to_ack message to the Root Port by asserting pme_to_cr.
Physical Layer Interface Signals
Altera provides an integrated solution with the Transaction, Data Link and Physical Layers. The IP
Parameter Editor generates a SERDES variation file, <variation>_serdes.v or .vhd , in addition to the Hard
IP variation file, <variation>.v or .vhd. The SERDES entity is included in the library files for PCI Express.
2014.12.15
Physical Layer Interface Signals
4-47
Interfaces and Signal Descriptions
Altera Corporation
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