MEC1632 datasheet(154/636 Pages) MICROCHIP

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MEC1632

DS00001592B-page 154

 2012-2018 Microchip Technology Inc.

APPLICATION NOTE:

the RAM_Select bit in the AHB SRAM Configuration Register must be asserted (‘1’) to

properly configure the DCCM for use by the Embedded Memory Interface.

8.4.1

EMBEDDED MEMORY MAP

Each Embedded Memory interface provides direct access for the Host into two windows in the EC DCCM SRAM. This

mapping is shown in Figure 8-3, "Embedded Memory Addressing":

The Base addresses, the Read limits and the Write limits are defined by registers that are in the EC address space and

cannot be accessed by the Host. In each region, the Read limit need not be greater than the Write limit. The regions

can be contiguous or overlapping.For example, if the Region 0 Read limit is set to 0 and the Write limit is set to a positive

number, then the Embedded Memory interface defines a region in the EC memory that the EC can read and write but

is write-only for the host. This might be useful for storage of security data, which the Host might wish to send to the EC

but should not be readable in the event a virus invades the Host.

FIGURE 8-3:

EMBEDDED MEMORY ADDRESSING

DCCM

80_0000h

80_xxxxh

Region_0_Base_Address

Region_0_Write_Limit

Region_0_Read_Limit

Host Read/Write

Host Read Only

No Host Access

Region_1_Base_Address

Region_1_Write_Limit

Region_1_Read_Limit

Host Read/Write

Host Read Only

No Host Access

MEC1632 Datasheet(PDF) 154 Page - Microchip Technology