CS8900A datasheet(43/128 Pages) CIRRUS

43 / 128 page

DS271PP3

CS8900A

Crystal LAN™ ISA Ethernet Controller

CIRRUS LOGIC PRODUCT DATA SHEET

4.3.3 Interrupt Number

(Read/Write, Address: PacketPage base + 0022h)

The Interrupt Number Register defines the interrupt pin selected by the CS8900A. In a typical application the follow-

ing bus signals are tied to the following pins:

See Section 3.2 on page 18.

After reset, if no EEPROM is found by the CS8900A, then the register has the following initial state, which corre-

sponds to placing all the INTRQ pins in a high-impedance state. If an EEPROM is found, then the register’s initial

value may be set by the EEPROM. See Section 3.3 on page 19.

Reset value is: XXXX XXXX XXXX X100

4.3.4 DMA Channel Number

(Read/Write, Address: PacketPage base + 0024h)

The DMA Channel register defines the DMA pins selected by the CS8900A. In the typical application, the following

bus signals are tied to the following pins:

See Section 3.2 on page 18 and Section 5.4 on page 90.

After reset, if no EEPROM is found by the CS8900A, then the register has the following initial state which corre-

sponds to setting all DMRQ pins to high-impedance. If a EEPROM is found, then the register’s initial value may be

set by the EEPROM. See Section 3.3 on page 19.

Reset value is: XXXX XXXX XXXX XX11

Address 0023h

Address 0022h

00h

Interrupt number assignment:

0000 0000b= pin INTRQ0

0000 0001b= pin INTRQ1

0000 0010b= pin INTRQ2

0000 0011b= pin INTRQ3

0000 01XXb= All INTRQ pins high-impedence

Bus signal

Typical pin connection

IRQ5

INTRQ3

IRQ10

INTRQ0

IRQ11

INTRQ1

IRQ12

INTRQ2

Address 0025h

Address 0024h

00h

DMA channel assignment:

0000 0000b= pin DMRQ0 and DMACK0

0000 0001b= pin DMRQ1 and DMACK1

0000 0010b= pin DMRQ2 and DMACK2

0000 0011b= All DMRQ pins high-impedence

Bus signal

Typical pin connection

DRQ5

DACK5

DMRQ0

DMACK0

DRQ6

DACK6

DMRQ1

DMACK1

DRQ7

DACK7

DMRQ2

DMACK2

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