AN983 datasheet(25/91 Pages) ETC

25 / 91 page

AN983B

PCI/miPCI Fast Ethernet Controller with integrated PHY

R/W

BRE

Boot ROM Enable. The AN983B really enables its boot ROM

access only if both the memory space access bit (bit 1 of

CR1) and this bit are set to 1.

1: enable Boot ROM. (Combines with bit 1 of CR1)

R/W

This register should be initialized before accessing the boot ROM space. (Write 32’hffffffff return 32’h

fffe0001)

CR13 (offset = 34h), CP - Capabilities Pointer.

Bit #

Name

Descriptions

Default Val RW Type

31~8

---

Reserved

7~0

Capabilities Pointer.

C0h

CR15 (offset = 3ch), CI - Configuration Interrupt

Bit #

Name

Descriptions

Default Val RW Type

31~24

Max_Lat register. This value indicates “how often” the

AN983B needs to access to the PCI bus in the units of 250ns.

This value is loaded from serial EEPROM after power on or

hardware reset.

From

EEPROM

23~16

Min_Gnt register. This value indicates how long the AN983B

needs to retain the PCI bus ownership whenever it initiates a

transaction, in the units of 250ns. This value is loaded from

serial EEPROM after power on or hardware reset.

From

EEPROM

15~ 8

Interrupt Pin. This value indicates which of the four interrupt

request pins that AN983B is connected.

Always 01h: means the AN983B connects to INTA#

01h

7 ~ 0

Interrupt Line. This value indicates which of the system

interrupt request lines the INTA# of AN983B is routed to. The

BIOS will fill this field when it initializes and configures the

system. The AN983B driver can use this value to determine

priority and vector information.

R/W

CR16 (offset = 40h), DS - Driver Space for special purpose.

Bit #

Name

Descriptions

Default Val RW Type

31~16

---

Reserved

15~8

Driver Space for special purpose. Since this area won’t be

cleared in the software reset. The AN983B driver can use this

R/W area for special purpose.

R/W

7 ~ 0

---

Reserved

(offset = 80h), SIG - Signature of AN983B

Bit #

Name

Descriptions

Default Val RW Type

31~16

DID

Device ID, the device ID number of AN983B.

0981h

15~0

VID

Vendor ID, the vendor ID number of ADM Technology Corp.

1317h

ADMtek Inc.

www.admtek.com.tw

Rev. 1.8

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