82801FB Datasheet, PDF (654/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

Intel^® High Definition Audio Controller Registers (D27:F0)
18.2.4
18.2.5
OUTPAY—Output Payload Capability Register
(Intel^® High Definition Audio Controller—D27:F0)
Memory Address: HDAR + 04h
Default Value: 003Ch
Attribute:
Size:
RO
16 bits
Bit
Description
15:7 Reserved.
Output Payload Capability — RO. Hardwired to 3Ch indicating 60 word payload.
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
6:0 payload.
00h = 0 word
01h = 1 word payload.
.....
FFh = 256 word payload.
INPAY—Input Payload Capability Register
(Intel^® High Definition Audio Controller—D27:F0)
Memory Address: HDBAR + 06h
Default Value: 001Dh
Attribute:
Size:
RO
16 bits
Bit
Description
15:7 Reserved.
Input Payload Capability — RO. 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
6:0 ^{response, leaving 29 words available for data payload.}
00h = 0 word
01h = 1 word payload.
.....
FFh = 256 word payload.
654
Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet