CS8920 datasheet(43/66 Pages) CIRRUS

43 / 66 page

AN84REV1

CS8920 Technical Reference Manual

3.3.1 IEEE Physical Address

The format of the 48-bit IEEE physical

address as expected by the MAC driver is

illustrated by the following example. (Must

be initialized by OEM before shipping

adapter.)

Example physical address:

000102030405h

Addr

Word

Description

1Ch

0100h

bits[39-32], bits[47-40] of IEEE addr.

1Dh

0302h

bits[23-16], bits[31-24] of IEEE addr.

1Eh

0504h

bits[7-0], bits[15-8] of IEEE addr.

3.3.2 ISA Configuration Flags

The ISA Configuration Flags specify how

the CS8920 will utilize ISA system

resources.

Bit 15: Memory Mode Flag

Indicates the CS8920 will use shared

memory for IO operations. Refer to the

CS8920 Data Sheet for description of

shared memory interface. Default is

disabled.

Bit 14: Boot PROM Flag

Indicates a Boot PROM is installed. Refer

the CS8920 Data Sheet for a discussion of

the Boot PROM . (Must be initialized by

OEM before shipping adapter.)

Bit 13: Reserved (set to 0)

Bit 12: DMA Burst

Refer to the CS8920 Data Sheet for a

discussion of DMA Burst control. Default

is enabled.

Bits 11-10: Reserved (set to 0)

Bit 9: DMA Buffer Size

Indicates whether the DMA buffer size

should be 16K or 64K. Refer to the

CS8920 Data Sheet for a discussion of

DMA Buffer size. Default is 16K.

Bit 8: IOCHRDY Enable

Refer to the CS8920 Data Sheet for a

discussion of IOCHRDY control. Default

is enabled.

Bit 7: UseSA

Refer to the CS8920 Data Sheet for a

discussion of UseSA control. Default is

enabled.

Bits 6-4: DMA Channel Select

Refer to the CS8920 Data Sheet for a

discussion of DMA channel selection for

the CS8920. Default is DRQ4 (disabled).

Bits 3-0: IRQ Channel Select

Refer to the CS8920 Data Sheet for a

discussion of IRQ channel selection for the

CS8920. Default is IRQ 10.

3.3.3 PacketPage Memory Base

Bits 15-4: 12 MSB of Memory Base

Address

The twelve most significant bits of the 24-

bit address locating the base of the

CS8920’s PacketPage memory. The lower

twelve bits are assumed to be 0. Default is

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