PIC16F639-E/SS【PDF 26/74 页】IC MCU FLASH 2KX14 20SSOP

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Micrel, Inc.

KSZ8841-PMQL

October 2007

M9999-100407-1.5

Subsystem ID Register (CSID Offset 2CH)

The CSID register is a read-only 32-bit register. The content of the CSID is loaded from the EEPROM after hardware

reset. The loading period lasts at least 27,400 PCI cycles when the system is in 33MHz mode, and starts 50 cycles

after hardware reset desertion. If the host accesses the CSID before its content is loaded from the EEPROM, the

KSZ8841-PMQL responds with retry termination on the PCI bus.

The following table shows the CSID register bit fields.

Bit

Description

31 - 16

Subsystem ID

Indicates a 16-bit field containing the subsystem ID.

15 - 0

Subsystem Vendor ID

Indicates a 16-bit field containing the subsystem vendor ID.

The following table shows the access rules of the register.

Capabilities Pointer Register (CCAP Offset 34H)

The CCAP register points to the base address of the power management register block in the configuration address

space. This pointer is valid only if the new capability bit in CFCS is set.

The following table shows the CCAP register bit fields.

Bit

Default

Description

31 - 8

0x000000

Reserved

7 - 0

Capabilities Pointer

Points to the location of the power management register block in the PCI

configuration space. The value of this field is determined by the New

Capabilities bit 15 in the EEPROM. If this bit is set, the value of this field is

0x50, which stands for Support Power Management. Otherwise, this field

is read as 0x00.

Configuration Interrupt Register (CFIT Offset 3CH)

The CFIT register is divided into two sections: the interrupt line and the interrupt pin. CFIT configures both the system’s

interrupt and the KSZ8841-PMQL interrupt pin connection.

The following table shows the CFIT register bit fields.

Bit

Default

Description

31 - 24

0x28

MAX_LAT

This field indicates how often the device needs to gain access to the PCI

bus. Time unit is equal to 0.25 us, assuming a PCI clock frequency of 33

MHz. The value after a hardware reset is 0x28 (10 us).

23 - 16

0x14

MIN_GNT

This field indicates the burst period length that the device needs. Time unit

is equal to 0.25us, assuming a PCI clock frequency of 33 MHz. The value

after a hardware reset is 0x14 (5 us).

15 - 8

0x01

Interrupt Pin

Indicates which interrupt pin that the KSZ8841-PMQL uses. The KSZ8841-

PMQL uses INTA# and the read value is 0x01.

7 - 0

0x00

Interrupt Line

Category

Description

Value after hardware reset

Read from EEPROM.

Write access rules

Write has no effect on the KSZ8841-PMQL.

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