pc87591l-n05 National Semiconductor Corporation, pc87591l-n05 Datasheet - Page 251

• Manufacturer Part Number: pc87591l-n05
• Description: Lpc Mobile Embedded Controller
• Manufacturer: National Semiconductor Corporation

Revision 1.2
5.0 Host Controller Interface Modules
5.2
The PC87591L-N05 implements two PM communication channels, both of which are compliant with ACPI specifications for
an embedded controller interface. The PC87591L-N05 may be configured to work in either Private Interface or Shared In-
terface mode. The PM interface has two identical channels, which are individually configured and used. If using only one
channel, Shared Interface mode should be used; if using both channels, Private Interface mode may be used.
The description below refers to a single channel. The signals may have the suffix ‘n’ to indicate the channel number, either
1 or 2, where applicable. Registers in the core domain have the prefix HIPMn to indicate the channel number. Host domain
registers are identified by the logical device to which they belong.
Note: When working in PC87570 Compatible mode, only channel 1 may be used.
5.2.1
5.2.2
The PM channel has two modes of operation:
Figure 86 is a schematic diagram of the PM channel.
• Two operation modes
• ACPI embedded controller interface compliant support
• PM channel registers (channel 1: legacy 62
• PM interrupt using
• PC87570 Compatible (available for channel 1 only) supports software previously written for the PC87570.
• Enhanced PM includes a mechanism that facilitates easier generation of SCI and SMI interrupts to the host.
— PC87570 Compatible
— Enhanced PM
— Shared interface
— Private interface
— Command/Status
— Data
— IRQ
— SMI
— SCI
Interrupt to the Host Processor
Output Buffer
POWER MANAGEMENT (PM) CHANNELS
Interrupts to the Core
Features
General Description
Empty
IRQ
SMI SCI
Input Buffer
Full
Figure 86. Host Interface PM Channel n Block Diagram
Status
Host-WR-Data Buffer
16
Host-RD-Data-Buffer
, 66
16
(Continued)
; channel 2: legacy 68
251
DBBOUT
WR-PM
D0-7
Command/Status
16
, 6C
16
)
or Data
RD-PM
Buffer
DBBIN
Peripheral Bus
D0-7
SIB Bus
www.national.com