MEC1322 datasheet(119/456 Pages) MICROCHIP

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DS00001719D-page 119

MEC1322

some operations as a result. When it is completed processing the packet, the EC can inform the Host, either

through a message in the EC-to-Host channel or by triggering an event such as an SMI directly. If return results

are required, the EC can write the results into the Read/Write region, which the Host can read directly when it is

informed that the EC has completed processing. Depending on the command, the operations could entail update

of virtual registers in the 32-bit internal address space, reads of any register in the EC address space, or writes of

any register in the EC address space. Because there are two regions that are defined by the base registers, the

memory used for the communication packet does not have to be contiguous with a set of virtual registers.

Because there are two Embedded Memory Interface memory regions, the Embedded Memory Interface cannot be used

for more than two of these functions at a time. The Host can request that the EC switch from one function to another

through the use of the Host-to-EC mailbox register.

The Application ID Register is provided to help software applications track ownership of an Embedded Memory Inter-

face. An application can write the register with its Application ID, then immediately read it back. If the read value is not

the same as the value written, then another application has ownership of the interface.

9.9

Runtime Registers

The registers listed in the Runtime Register Summary table are for a single instance of the EMI. The addresses of each

register listed in this table are defined as a relative offset to the host “Base Address” defined in the Runtime Register

Base Address Table.

Note 9-1

The Base Address indicates where the first register can be accessed in a particular address space

for a block instance.

Note:

The protocol used to pass commands back and forth through the Embedded Memory Interface Registers

Interface is left to the System designer. Microchip can provide an application example of working code in

which the host uses the Embedded Memory Interface registers to gain access to all of the EC registers.

TABLE 9-5:

RUNTIME REGISTER BASE ADDRESS TABLE

Block Instance

Instance

Number

Host

Address Space

Base Address (

Note 9-1)

EMI

32-bit internal

address space

400F_0000h

EMI

LPC

I/O

Programmed BAR

TABLE 9-6:

RUNTIME REGISTER SUMMARY

Offset

00h

HOST-to-EC Mailbox Register

01h

EC-to-HOST Mailbox Register

02h

EC Address LSB Register

03h

EC Address MSB Register

04h

EC Data Byte 0 Register

05h

EC Data Byte 1 Register

06h

EC Data Byte 2 Register

07h

EC Data Byte 3 Register

08h

Interrupt Source LSB Register

09h

Interrupt Source MSB Register

0Ah

Interrupt Mask LSB Register

0Bh

Interrupt Mask MSB Register

0Ch

Application ID Register

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