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ISP1581

Universal serial bus 2.0 high-speed interface device

Philips Electronics 

Philips Semiconductors

ISP1581

USB 2.0 HS interface device

8. Modes of operation

The ISP1581 has two bus configuration modes, selected via pin BUS_CONF/DA0 at

power-up:

• Split Bus mode (BUS_CONF = 0): 8-bit multiplexed address/data bus and

separate 8-bit/16-bit DMA bus

• Generic Processor mode (BUS_CONF = 1); separate 8-bit address and 16-bit

data bus

Details of the bus configurations for each mode are given in Table 3. Typical interface

circuits for each mode are given in Section 14.

Table 3: Bus configuration modes

BUS_CONF PIO width

DMA width

Description

DMAWD = 0 DMAWD = 1

0

AD[7:0]

D[7:0]

D[15:0] Split Bus mode: multiplexed address/data on pins AD[7:0];

separate 8/16-bit DMA bus on pins DATA[15:0]

1

A[7:0]

D[7:0]

D[15:0] Generic Processor mode: separate 8-bit address on pins

D[15:0]

AD[7:0]; 16-bit data (PIO and DMA) on pins DATA[15:0]

9. Register descriptions

Table 4: Register summary

Name

Destination

Initialization registers

Address

Mode

device

device

Interrupt Configuration

device

Interrupt Enable

DMA Configuration

DMA Hardware

Data flow registers

Endpoint Index

Control Function

Data Port

Buffer Length

Endpoint MaxPacketSize

Endpoint Type

device

DMA controller

DMA controller

endpoints

endpoint

endpoint

endpoint

endpoint

endpoint

Short Packet

endpoint

Address

(Hex)

Description

Size

(bytes)

00

USB device address + enable

1

0C

power-down options, global interrupt

1

enable, SoftConnect

10

interrupt sources, trigger mode, output 1

polarity

14

interrupt source enabling

4

38

see sub-section “DMA registers”

2

3C

see sub-section “DMA registers”

1

2C

endpoint selection, data flow direction

1

28

endpoint buffer management

1

20

data access to endpoint FIFO

2

1C

packet size counter

2

04

maximum packet size

2

08

selects endpoint type: control,

2

isochronous, bulk or interrupt

24

short packet received on OUT endpoint 2

9397 750 09665

Product data

Rev. 04 — 18 July 2002

© Koninklijke Philips Electronics N.V. 2002. All rights reserved.

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