TMPR4937 datasheet(316/552 Pages) TOSHIBA

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Chapter 10 PCI Controller

10-58

Bit

Mnemonic

Field Name

Description

Read/Write

4:0

CPAS

Current PCI Bus

Arbiter State

Current PCI Bus Arbiter State (Default: 0x00)

Displays the State Machine that was selected by the FSM bit.

Please refer to Figures 12.5.3 and 12.11.1 for an explanation of

Agent/Grant A - W and Level 2.

When FSM =1:

0x00: Preparation state for transferring bus ownership to PCI Agent A.

0x01: State in which Grant A is provided to PCI Agent A when PCI Bus

ownership is being held elsewhere.

0x02: State in which Grant A is provided to PCI Agent A when PCI Bus

ownership is not being held elsewhere.

0x03: The agent that was provided Grant A exists in this state. If there is

bus ownership, the PCI Bus Arbiter transfers bus ownership to

another agent.

0x04: Preparation state for transferring bus ownership to PCI Agent B.

0x05: State in which Grant B is provided to PCI Agent B when PCI Bus

ownership is being held elsewhere.

0x06: State in which Grant B is provided to PCI Agent B when PCI Bus

ownership is not being held elsewhere.

0x07: The agent that was provided Grant B exists in this state. If there is

bus ownership, the PCI Bus Arbiter transfers bus ownership to

another agent.

0x08: Preparation state for transferring bus ownership to PCI Agent C.

0x09: State in which Grant C is provided to PCI Agent C when PCI Bus

ownership is being held elsewhere.

0x0A: State in which Grant C is provided to PCI Agent C when PCI Bus

ownership is not being held elsewhere.

0x0B: The agent that was provided Grant C exists in this state. If there is

bus ownership, the PCI Bus Arbiter transfers bus ownership to

another agent.

0x0C: Preparation state for transferring bus ownership to PCI Agent D.

0x0D: State in which Grant D is provided to PCI Agent D when PCI Bus

ownership is being held elsewhere.

0x0E: State in which Grant D is provided to PCI Agent D when PCI Bus

ownership is not being held elsewhere.

0x0F: The agent that was provided Grant D exists in this state. If there is

bus ownership, the PCI Bus Arbiter transfers bus ownership to

another agent.

0x10: Preparation state for transferring bus ownership to PCI Agent Level

0x11: State in which Grant Level 2 is provided to PCI Agent Level 2 when

PCI Bus ownership is being held elsewhere.

0x12: State in which Grant Level 2 is provided to PCI Agent Level 2 when

PCI Bus ownership is not being held elsewhere.

0x13: The agent that was provided Grant Level 2 exists in this state. If

there is bus ownership, the PCI Bus Arbiter transfers bus ownership

to another agent.

When FSM=0, the FSM=1 description is replaced as follows: A

→W, B→X,

→Y, D→Z, Level 2→N/A.

Figure 10.4.28 PCI Bus Arbiter Current State Register (2/2)

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