TMPR4937 datasheet(296/552 Pages) TOSHIBA

296 / 552 page

Chapter 10 PCI Controller

10-38

10.4.13 PCI Configuration 2 Register (PCICFG2) 0xD03C

The following fields correspond to the following registers:

Max. Latency field

→ Max_Lat Register of the PCI Configuration Space

Min. Grant field

→ Min_Gnt Register of the PCI Configuration Space

Interrupt Pin field

→ Interrupt Pin Register of the PCI Configuration Space

Interrupt Line field

→ Interrupt Line Register of the PCI Configuration Space

This register cannot be accessed when the PCI Controller is in the Satellite mode.

R/L

: Type

0x0A

0x02

: Initial value

R/L

R/W

: Type

0x01

0x00

: Initial value

Bits

Mnemonic

Field Name

Description

Read/Write

31:24

Maximum

Latency

Max_Lat (Maximum Latency) (Default: 0x0A)

00h: Does not use this register to determine PCI Bus priority.

01h-FFh: Specifies the time interval for requesting bus ownership.

In units of 250 ns, assuming the PCICLK is 33 MHz.

It is possible to change the maximum latency by loading data from

Configuration EEPROM during initialization.

R/L

23:16

Minimum Grant

Min_Gnt (Minimum Grant) (Default: 0x02)

00h: Is not used to calculate the latency timer value.

01h-FFh: Sets the time required for Burst transfer.

In units of 250 ns, assuming the PCICLK is 33 MHz.

It is possible to change this value by loading data from Configuration

EEPROM during initialization.

R/L

15:8

Interrupt Pin

Interrupt Pin (Default: 0x01)

Valid values: 00 - 04h

00h: Do not use interrupt signals.

01h: Use Interrupt signal INTA*

02h: Use Interrupt signal INTB*

03h: Use Interrupt signal INTC*

04h: Use Interrupt signal INTD*

05h - FFh: Reserved

It is possible to change this value by loading data from Configuration

EEPROM during initialization.

When using either the REQ[2]* signal or the PIO signal to report an

interrupt to an external device as the PCI device, please use EEPROM to

set the connection with that device.

R/L

7:0

Interrupt Line

Interrupt Line (Default: 0x00)

This is a readable/writable 8-bit register. The software uses this register to

indicate information such as the interrupt signal connection information.

Operation of the TX4937 is not affected.

R/W

Figure 10.4.11 PCI Configuration 2 Register

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