82801FB Datasheet, PDF (665/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

Intel^® High Definition Audio Controller Registers (D27:F0)
18.2.27
RIRBSIZE—RIRB Size Register
(Intel^® High Definition Audio Controller—D27:F0)
Memory Address: HDBAR + 5Eh
Default Value: 42h
Attribute:
Size:
RO
8 bits
Bit
Description
7:4
RIRB Size Capability — RO. Hardwired to 0100b indicating that the ICH6 only supports a RIRB size
of 256 RIRB entries (2048B)
3:2 Reserved.
1:0 RIRB Size — RO. Hardwired to 10b which sets the CORB size to 256 entries (2048B)
18.2.28
IC—Immediate Command Register
(Intel^® High Definition Audio Controller—D27:F0)
Memory Address: HDBAR + 60h
Default Value: 00000000h
Attribute:
Size:
R/W
32 bits
Bit
Description
Immediate Command Write — R/W. The command to be sent to the codec via the Immediate
31:0 Command mechanism is written to this register. The command stored in this register is sent out over
the link during the next available frame after a 1 is written to the ICB bit (HDBAR + 68h: bit 0)
18.2.29
IR—Immediate Response Register
(Intel^® High Definition Audio Controller—D27:F0)
Memory Address: HDBAR + 64h
Default Value: 00000000h
Attribute:
Size:
RO
32 bits
Bit
Description
Immediate Response Read (IRR) — RO. This register contains the response received from a codec
resulting from a command sent via the Immediate Command mechanism.
31:0 _{If multiple codecs responded in the same time, there is no guarantee as to which response will be}
latched. Therefore, broadcast-type commands must not be issued via the Immediate Command
mechanism.
Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet
665