MEC1404 Datasheet, PDF (154/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
Note 1: If accessing the Global Configuration Registers, step (a) is not required.
2: Any write to an undefined or reserved Configuration register is terminated normally on the LPC bus without
any modification of state in the MEC140X/1X. Any read to an undefined or reserved Configuration register
returns FFh.
The following sections define the Global Configuration registers and the Logical Configuration registers.
7.7.1 GLOBAL CONTROL/CONFIGURATION REGISTERS
As with all Configuration Registers, the INDEX PORT is used to select a Global Configuration Register in the chip. The
DATA PORT is then used to access the selected register. The INDEX and DATA PORTs are defined in the LPC Interface
description.
TABLE 7-2: CHIP-LEVEL (GLOBAL) CONTROL/CONFIGURATION REGISTERS
Register
Offset
Description
Reserved
Logical Device Number
Reserved
Device Revision
Chip (Global) Control Registers
00h - 06h
07h
08h - 1Bh
1Ch
Reserved - Writes are ignored, reads return 0.
A write to this register selects the current logical device. This
allows access to the control and configuration registers for
each logical device.
Note: The Activate command operates only on the
selected logical device.
Reserved - Writes are ignored, reads return 0.
A read-only register which provides device revision informa-
tion.
Device Sub ID
Bits[7:0] = current revision when read
1Dh
Device Sub ID[7:0]
Read-Only register which provides the device sub-identifica-
tion. The value of this register is product dependent. See
Table 7-3, “Device Identification per Product,” on page 155.
Device ID[7:0]
Device ID[15:8]
Legacy Identification
Reserved
1Eh
1Fh
20h
21h - 23h
Device ID[7:0]
Read-Only register which provides Device ID LSB. The value
of this register is product dependent. See Table 7-3, “Device
Identification per Product,” on page 155.
Device ID[15:8]
Read-Only register which provides Device ID MSB. The value
of this register is product dependent. See Table 7-3, “Device
Identification per Product,” on page 155.
Legacy Identification
A read-only register which provides device identification to
legacy and test software. This field is hard-coded to FEh, indi-
cating this is a MIPs product with 16-bit Device ID at offsets
1Eh & 1Fh.
Reserved.
DS00001956D-page 154
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