MEC1322 Datasheet, PDF (166/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
12.11 Runtime Registers
The registers listed in the Runtime Register Summary table are for a single instance of the Mailbox. The addresses of
each register listed in this table are defined as a relative offset to the host “Base Address” defined in the Runtime Reg-
ister Base Address Table.
TABLE 12-7: RUNTIME REGISTER BASE ADDRESS TABLE
Block Instance
Instance Number
Host
Address Space
Base Address
Mailbox Interface
0
LPC
I/O
Programmed BAR
EC
32-bit address
400F_2400h
space
The Base Address indicates where the first register can be accessed in a particular address space for a block instance.
TABLE 12-8: RUNTIME REGISTER SUMMARY
Offset
Register Name (Mnemonic)
0h
MBX_INDEX Register
1h
MBX_DATA Register
12.11.1 MBX_INDEX REGISTER
Offset ^0h
Bits
Description
7:0 INDEX
The index into the mailbox registers listed in Table 12-10, "EC-Only
Register Summary".
Type
R/W
12.11.2 MBX_DATA REGISTER
Default
0h
Reset
Event
VCC1_R
ESET
and
PWRGD=
0
Offset ^01h
Bits
Description
7:0 DATA
Data port used to access the registers listed in Table 12-10, "EC-
Only Register Summary".
Type
R/W
Default
0h
Reset
Event
VCC1_R
ESET
and
PWRGD=
0
12.12 EC-Only Registers
The registers listed in the EC-Only Register Summary table are for a single instance of the Mailbox. The addresses of
each register listed in this table are defined as a relative offset to the host “Base Address” defined in the EC-Only Reg-
ister Base Address Table.
TABLE 12-9: EC-ONLY REGISTER BASE ADDRESS TABLE
Block Instance
Instance Number
Host
Address Space
Base Address
Mailbox Interface
0
EC
32-bit address
400F_2500h
space
The EC-Only registers can be accessed by the EC at the EC Offset from the Base Address. In addition, the registers
can be accessed through the Host Access Port, at the indexes listed in the following tables as “MBX_INDEX”.
DS00001719D-page 166
 2014 - 2015 Microchip Technology Inc.