MEC1632 datasheet(59/636 Pages) MICROCHIP

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DS00001592B-page 59

MEC1632

4.3.2

AHB ADDRESS SPACE

The components on the AHB subsystem and the two SPB bridges define a set of addresses that are accessible by the

EC. This address space is shown in Table 4-1, "MEC1632 Peripheral Address Space". As shown in the table, the Host

can access much of the address space, but not all.

The address range of FD_0000h through FE_FFFFh is reserved in MEC1632.

The 64KB address space of an SPB Bridge is divided into 1KB Frames. Peripherals are grouped into Logical Devices;

each Logical Device corresponds to a 1KB Frame. Logical Devices addressable by the Host are listed in Table 4-2,

"Host Logical Devices in the MEC1632". Logical device numbers not listed in Table 4-2 are reserved.

The 1KB Address Frame of a Host Logical Device is divided into four subregions, as described in Section 4.4.2,

"Address Framing," on page 61.

The 64KB address space of the ARC-only SPB Bridge is divided into 1KB Frames. Peripherals are grouped into Logical

Devices; each Logical Device corresponds to a 1KB Frame. These EC Logical Devices addressable by the ARC-only

are listed in Table 4-3, "EC Logical Devices on MEC1632". Multiple instantiations of the same block are in a single 1KB

Frame. Each instantiation is separated by 128 bytes.

TABLE 4-1:

MEC1632 PERIPHERAL ADDRESS SPACE

Address Range

Device

Accessible

by EC

Accessible

by Host

F0_0000h - F0_FFFFh

ARC-only

SPB Bridge

Yes

FD_0000h - FE_FFFFh

Reserved

FF_0000h -

FF_BFFFh and

FF_D000h -

FF_FFFFh

LPC

SPB Bridge

Yes

(limited by LPC interface

map)

TABLE 4-2:

HOST LOGICAL DEVICES IN THE MEC1632

Logical Device

Number

Logical Devices

AHB Address

of Frame

Runtime

Registers

Configuration

Registers

EC-only

Registers

Mailbox Interface

FF_0000h

yes

Keyboard Controller

(8042)

FF_0400h

yes

ACPI EC Channel 0

FF_0800h

yes

ACPI EC Channel 1

FF_0C00h

yes

ACPI EC Channel 2

FF_1000h

yes

ACPI EC Channel 3

FF_1400h

yes

ACPI PM1

FF_1800h

yes

UART

FF_1C00h

yes

Legacy (Fast KB)

FF_2000h

yes

LPC Interface

FF_3000h

yes

Reserved

FF_3400h

yes

Embedded Flash Inter-

face

FF_3800h

yes

Flash SPI

FF_3C00h

yes

10h

EM Interface

FF_4000h

yes

11h

Real Time Clock

FF_4400h

yes

20h

BIOS Debug Port 0

FF_8000h

yes

21h

BIOS Debug Port 1

FF_8400h

yes

3Fh

Global Configuration

FF_FC00h

yes

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