31
|
30
|
29
|
28
|
27
|
26
|
25
|
24
|
23
|
22
|
21
|
20
|
19
|
18
|
17
|
16
|
15
|
14
|
13
|
12
|
11
|
10
|
9
|
8
|
7
|
6
|
5
|
4
|
3
|
2
|
1
|
0
|
|||||||
0
|
Reserved
|
Reserved
|
R
|
R
|
R
|
R
|
PM
Port
|
FIS
Type (46h)
|
||||||||||||||||||||||||||||||
.
|
N
Dwords of data
(minimum
of one Dword - maximum of 2048 Dwords)
|
|||||||||||||||||||||||||||||||||||||
.
|
||||||||||||||||||||||||||||||||||||||
n
|
||||||||||||||||||||||||||||||||||||||
FIS
Type - Set to a value of 46h. Defines the rest of
the FIS fields. Defines the length of the FIS as n+1 Dwords.
Dwords
of data - Contain the actual data to transfer. Only
32 bit fields are transferred. The last Dword is padded with zeros when only a partial
Dword is to be transmitted.
NOTE - The maximum amount of user data that may be sent in a single Data – Host
to Device or Data – Device to Host FIS is limited. See description.
PM Port
– When an endpoint device is attached via a Port Multiplier,
specifies the device port address that the FIS should be delivered to or is
received from. This field is set by the host for Host to Device transmission
and this field is set by the Port Multiplier for Device to Host transmission.
Endpoint devices shall set this field to 0h for Device to Host transmissions.
R –
Reserved – shall be cleared to zero.
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