
272
Registers
Chapter 4
AMD-8111 HyperTransport I/O Hub Data Sheet
24674
Rev. 3.00
April 2003
AMD Preliminary Information
AC
‘
97 Modem Controller Global Status
MC40
Default:
0030_0000h
Attribute:
see below.
3
SHUTOFF. ACLINK Shut Off
. Read-write. 1 = Disable the AC-link signals (drive all AC
‘
97 outputs
Low and ignore all AC
‘
97 input buffer enables). 0 = Enable the AC-link signals. Wake-up event
detection is independent of this bit.
WRST. AC
‘
97 Warm Reset
. Read-write. Writing a 1 to this bit causes a warm reset to occur on the
AC-link. The warm reset awakens a suspended codec without clearing its internal registers. If software
attempts to perform a warm reset while ACCLK is running, the write is ignored and the bit is not
changed. A warm reset can only occur in the absence of ACCLK. This bit is self-clearing (it clears
itself after the reset has occurred and ACCLK has started).
CRST_L. AC
‘
97 Cold Reset, active Low
. Read-write. Writing to 0 to this bit causes a cold reset to
occur on the AC-link. All data in the codec is lost. Software needs to set this bit no sooner than after 1
μ
s has elapsed. This bit re
fl
ects the state of the ACRST_L pin. This bit is cleared to 0 upon entering
S3/S4/S5 sleep states, and by SM_RESET_L and RESET_L assertions.
GPIIEN. GPI Interrupt Enable
. Read-write. This bit controls whether the change in status of any GPI
(General Purpose Input/Output, con
fi
gured as an input) causes an interrupt. 1 = The change on value
of a GPI causes an interrupt and sets bit 0 of the Global Status Register. 0 = Bit 0 of the Global Status
Register is set, but an interrupt is not generated.
2
1
0
Bits
31:22 Reserved
21
PCM6CAP. 6 Channel Capability
.Read-only. Hardwired to 1.
0 = AC
‘
97 doesn
’
t support 6-channel Audio output.
1 = AC
‘
97 supports 6-channel Audio output.
20
PCM4CAP. 4 Channel Capability
. Read-only. Hardwired to 1.
0 = AC
‘
97 doesn
’
t support 4-channel Audio output.
1 = AC
‘
97 supports 4-channel Audio output.
19:18 Reserved
17
MD3. Power down semaphore for Modem
. Read-write. This bit is used by software in conjunction
with the AD3 bit to coordinate the entry of the two codecs into D3 state. This bit resides in the
VDD_COREX well and maintains context across power states. This bit has no hardware function.
16
AD3. Power down semaphore for Audio
. Read-write. This bit is used by software in conjunction with
the MD3 bit to coordinate the entry of the two codecs into D3 state. This bit resides in the
VDD_COREX well and maintains context across power states. This bit has no hardware function.
15
RCSTAT. Read Complete Status
. Read-write. This bit indicates the status of Codec read
completions. 1 = Codec read failed due to one of the following errors: a time-out, or that ACCLK is
detected to not be operating adequately. This bit remains set until being cleared by software. 0 =
Codec read completes normally. This bit is cleared by writing a 1 to this bit position.
14
S12BIT3. Bit 3 of slot 12: Display bit 3 of the most recent slot 12 from modem codec
.
Description
13
S12BIT2. Bit 2 of slot 12: Display bit 2 of the most recent slot 12 from modem codec
.
12
S12BIT1. Bit 1 of slot 12: Display bit 1 of the most recent slot 12 from modem codec
.