Intel® HD Audio (D27:F0)
10.3.4
OUTPAY—Output Payload Capability Register
Memory Address:
Default Value:
LBAR + 04h
003Ch
Attribute:
Size:
RO
16 bits
Default
Bit
and
Description
Access
0
RO
15:7
Reserved
Output Payload Capability (OUT): Indicates the total output payload
available on the link as 60 words (120 bytes).
This field indicates the total output payload available on the link. This does
not include bandwidth used for command and control.
This measurement is in 16-bit word quantities per 48-MHz frame.
The default link clock of 24.000 MHz (the data is double pumped) provides
1000 bits per frame, or 62.5 words in total. 40 bits are used for command
and control, leaving 60 words available for data payload.
3Ch
RO
6:0
00h = 0 word
01h = 1 word payload
.....
FFh = 256 word payload
10.3.5
INPAY—Input Payload Capability Register
Memory Address:
Default Value:
LBAR + 06h
001dh
Attribute:
Size:
RO
16 bits
Default
Bit
and
Description
Access
0
RO
15:7
Reserved
Input Payload Capability (IN): Hardwired to 1Dh indicating 29 word
payload.
This field indicates the total output payload available on the link. This does
not include bandwidth used for response. This measurement is in 16-bit
word quantities per 48-MHz frame. The default link clock of 24.000 MHz
provides 500 bits per frame, or 31.25 words in total. 36 bits are used for
response, leaving 29 words available for data payload.
1Dh
RO
6:0
00h = 0 word
01h = 1 word payload
.....
FFh = 256 word payload
Datasheet
145
INTEL [ INTEL ]
