ECE1200 datasheet(27/87 Pages) MICROCHIP

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DS00003093C Draft-page 27

ECE1200

5.5.2

BOOT_DONE

The BOOT_DONE option selects the eSPI Slave role (Primary or Secondary) that the ECE1200 should assume. The

Secondary Slave role is more passive than the Primary Slave role, in that it does not participate in Virtual Wire hand-

shake responses over eSPI. It does receive the initial Virtual Wire, but for information only. For examples of system con-

figurations and BOOT_DONE connections for them, see the figures in Section 1.1, "System Block Diagrams," on

page 5.

BOOT_DONE is not sampled at any one time, but has its effect continuously, and may either be strapped to a static

value or be changed once, as explained below.

• BOOT_DONE = permanently High means that the ECE1200 serves as the Primary eSPI slave. This means that

the Chipset has only one ESPI_CS# pin, or that there are two eSPI slaves and the ESPI_CS# on the ECE1200 is

connected to the Chipset’s ESPI_CS0# pin.

The output pin SUSPWRDNACK/HOST_RST_ACK is driven as the SUSPWRDNACK function, and the internal

HOST_RST_ACK state is transmitted as a Virtual Wire.

At the first opportunity, the Virtual Wires SLAVE_BOOT_LOAD_DONE and SLAVE_BOOT_LOAD_STATUS are

both transmitted as ‘1’ to the Chipset, freeing the system to boot above the S5 state.

• BOOT_DONE = permanently Low means that the ECE1200 serves as a Secondary eSPI slave of two or more in

the system (that is, it is connected to ESPI_CS1# or higher from the Chipset).

The SLAVE_BOOT_LOAD_DONE and SLAVE_BOOT_LOAD_STATUS Virtual Wires are not transmitted, and

instead come from the Primary Slave, which is required to be present also.

The output pin SUSWARN# is driven from its Virtual Wire, but is not expected to be used by the system. The input

pin SUSACK# has no function in this configuration, and its state will be ignored.

The output pin SUSPWRDNACK/HOST_RST_ACK is driven as the HOST_RST_ACK function.

• BOOT_DONE = Low then High is a way of delaying booting of the system, by an ECE1200 wired as the Primary

Slave, if some system consideration requires a further delay after RSMRST# has gone high. While BOOT_DONE

remains low, the Virtual Wires SLAVE_BOOT_LOAD_DONE and SLAVE_BOOT_LOAD_STATUS are not yet

transmitted to the Chipset. On the rising edge of BOOT_DONE, these Virtual Wires are transmitted as ‘1’ values,

and the ECE1200 assumes its Primary eSPI Slave role from this time onward. No Virtual Wire traffic is lost in this

sequence, because it does not commence until the SLAVE_BOOT_LOAD_xxx Virtual Wires have been sent from

a Primary slave.

The output pin SUSPWRDNACK/HOST_RST_ACK is initially driven low (as HOST_RST_ACK, temporarily), then

driven as the SUSPWRDNACK function (also initially low) when BOOT_DONE rises.

TABLE 5-1:

BOOT_DONE

Description

ECE1200 assumes the Secondary eSPI Slave role. Certain Virtual Wire interactions

will not occur, deferring to another Primary device for this traffic.

SUSPWRDNACK/HOST_RST_ACK pin = HOST_RST_ACK

ECE1200 assumes the Primary eSPI Slave role. At the first opportunity, it will trans-

mit VWires SLAVE_BOOT_LOAD_DONE and SLAVE_BOOT_LOAD_STATUS as ‘1’

to the Chipset.

SUSPWRDNACK/HOST_RST_ACK pin = SUSPWRDNACK

0 then 1

ECE1200 assumes the Primary eSPI Slave role at the rising edge. It will transmit

VWires SLAVE_BOOT_LOAD_DONE and SLAVE_BOOT_LOAD_STATUS as ‘1’ to

the Chipset, either immediately or at the first opportunity provided by the eSPI Master

in the Chipset.

SUSPWRDNACK/HOST_RST_ACK pin = SUSPWRDNACK

1 then 0

Undefined action, and not allowed. It may lead to undefined operation in the system.

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