ISP1581BD datasheet(13/73 Pages) PHILIPS

13 / 73 page

Philips Semiconductors

ISP1581

USB 2.0 HS interface device

Objective speciﬁcation

Rev. 02 — 23 October 2000

13 of 73

9397 750 07648

9.1 Register access

• 8-bit bus: multi-byte registers are accessed lower byte (LSB) ﬁrst.

• 16-bit bus: for single-byte registers the upper byte (MSB) must be ignored.

Endpoint speciﬁc registers are indexed via the Endpoint Index register. The target

endpoint must be selected ﬁrst, before accessing the following registers:

• Buffer Length

• Control Function

• Data Port

• Endpoint MaxPacketsize

• Endpoint Type

• Short Packet.

9.2 Initialization registers

9.2.1

Address register (address: 00H)

This register is used to set the USB assigned address and enable the USB device.

Table 5 shows the Address register bit allocation.

The DEVEN and DEVADDR bits will be cleared whenever a bus reset, a power-on

reset or a soft reset occurs.

In response to the standard USB request SET_ADDRESS, the ﬁrmware must write

the (enabled) device address to the Address register, followed by sending an empty

packet to the host. The new device address is activated when the host acknowledges

the empty packet.

Table 5:

Address register: bit allocation

Bit

Symbol

DEVEN

DEVADDR[6:0]

Reset

00H

Bus reset

00H

Access

R/W

Table 6:

Endpoint Conﬁguration register: bit description

Bit

Symbol

Description

DEVEN

A logic 1 enables the device.

6 to 0

DEVADDR[6:0]

This ﬁeld speciﬁes the USB device address.

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