Datasheet

Intel
®
High Definition Audio
β
D27:F0
Intel
®
Atom™ Processor E6xx Series Datasheet
140
9.2.4 External Pull-Ups/Pull-Downs
The following table shows the resistors that should be mounted on the dock side of the
isolation switch. The resistors are used to discharge the signals to reduce the chance of
getting charge-sharing induced glitches when the switch is turned on via
HDA_DOCK_EN_B assertion. Pull-downs have been specified to match the level of the
signals when HDA_DOCK_EN_B is asserted as well as to not conflict with the internal
resistors.
9.3 PCI Configuration Register Space
The Intel
®
HD Audio
β
controller resides in PCI Device 27, Function 0 on Bus 0. This
function contains a set of DMA engines that are used to move samples of digitally
encoded data between system memory and external codecs.
All controller registers (including the memory mapped registers) must be addressable
as byte, word, and D-word quantities. The software must always make register
accesses on natural boundaries (i.e., D-word accesses must be on D-word boundaries,
word accesses on word boundaries, etc.). Note that the Intel
®
HD Audio
β
memory-
mapped register space must not be accessed with the LOCK semantic exclusive-access
mechanism. If software attempts exclusive-access mechanisms to the Intel
®
HD Audio
β
memory-mapped register space, the results are undefined.
9.3.1 Registers
Table 176. External Resistors
Signal Internal Resistors
1
External Resistors on Dock Side of
Isolation Switch
1
HDA_CLK Weak Pull-down None
HDA_SYNC None Weak Pull-Down
HDA_SDO None Weak Pull-Down
HDA_SDI (from docked
codec(s))
Weak Pull-down None
HDA_RST_B None NA
HDA_DOCK_EN_B None NA
HDA_DOCKRST_B None Weak Pull-Down
Note:
1. Weak Pull-down is about 10 kΩ.
Table 177. Intel
®
High Definition Audio
β
PCI Configuration Registers (Sheet 1 of 3)
Start End Symbol Register Name Reset Value Access
00 01 VID Vendor Identification 8086h RO
02 03 DID Device Identification 811Bh RO
04 05 PCICMD PCI Command 0000h RW, RO
06 07 PCISTS PCI Device Status 0010h RO
08 08 RID Revision Identification
01h (for B-0
Stepping)
02h (for B-1
Stepping)
RO
09 0B CC Class Codes 040300h RO