PI7C8150AND datasheet(73/111 Pages) PERICOM

73 / 111 page

PI7C8150A

2-PORT PCI-TO-PCI BRIDGE

Page 73 of 111

APRIL 2006 – Revision 1.1

Support of the B2 secondary bus power state when in the D3 hot power management

state

Table 11-1 shows the states and related actions that PI7C8150A performs during power

management transitions. (No other transactions are permitted.)

Table 11-1. Power Management Transitions

Current Status

Next State

Action

D3cold

Power has been removed from PI7C8150A. A power-up reset must

be performed to bring PI7C8150A to D0.

D3hot

If enabled to do so by the BPCCE pin, PI7C8150A will disable the

secondary clocks and drive them LOW.

Unimplemented power state. PI7C8150A will ignore the write to the

power state bits (power state remains at D0).

Unimplemented power state. PI7C8150A will ignore the write to the

power state bits (power state remains at D0).

D3hot

PI7C8150A enables secondary clock outputs and performs an internal

chip reset. Signal S_RST_L will not be asserted. All registers will

be returned to the reset values and buffers will be cleared.

D3hot

D3cold

Power has been removed from PI7C8150A. A power-up reset must

be performed to bring PI7C8150A to D0.

D3cold

Power-up reset. PI7C8150A performs the standard power-up reset

functions as described in Section 12.

PME# signals are routed from downstream devices around PCI-to-PCI bridges. PME#

signals do not pass through PCI-to-PCI bridges.

RESET

This chapter describes the primary interface, secondary interface, and chip reset

mechanisms.

12.1

PRIMARY INTERFACE RESET

PI7C8150A has a reset input, P_RESET_L. When P_RESET_L is asserted, the following

events occur:

PI7C8150A immediately tri-states all primary and secondary PCI interface signals.

PI7C8150A performs a chip reset.

Registers that have default values are reset.

P_RESET_L asserting and de-asserting edges can be asynchronous to P_CLK and

S_CLKOUT. PI7C8150A is not accessible during P_RESET_L. After P_RESET_L is de-

asserted, PI7C8150A remains inaccessible for 16 PCI clocks before the first configuration

transaction can be accepted.

06-0057

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