ISP1507CBS datasheet(39/74 Pages) NXP

39 / 74 page

ISP1507C_ISP1507D_1

Product data sheet

Rev. 01 — 28 May 2008

39 of 74

NXP Semiconductors

ISP1507C; ISP1507D

ULPI HS USB host and peripheral transceiver

PHY will not transmit any EOP. The ISP1507 will also detect if the PID byte is A5h,

indicating an SOF packet, and automatically send a long EOP when STP is asserted. To

transmit chirp and resume signaling, the link must set OPMODE[1:0] to 10b.

9.12 On-The-Go operations

On-The-Go (OTG) is a supplement to

Universal Serial Bus Speciﬁcation Rev. 2.0 that

allows a portable USB device to assume the role of a limited USB host by deﬁning

improvements, such as a small connector and low power. Non-portable devices, such as

standard hosts and embedded hosts, can also beneﬁt from OTG features.

The ISP1507 OTG PHY is designed to support all the tasks speciﬁed in the OTG

supplement. The ISP1507 provides the front-end analog support for Host Negotiation

Protocol (HNP) and Session Request Protocol (SRP) for dual-role devices. The

supporting components include:

• Voltage comparators

– A_VBUS_VLD

– SESS_VLD (session valid, can be used for both A-session and B-session valid)

– SESS_END (session end)

• Pull-up and pull-down resistors on DP and DM

• Charge and discharge resistors on VBUS

For complete OTG support, the system designer must add a VBUS power supply and

detect the value on the ID pin of the USB cable. This is not provided on the ISP1507.

The following subsections describe how to use the ISP1507 OTG components.

Fig 17. Transmitting USB packets without the automatic SYNC and EOP generation

CLOCK

DATA

[7:0]

TXCMD

00h

00h 00h 80h PID

...

... DN − 1

FEh

DIR

STP

NXT

TXVALID

TXREADY

TXBIT

STUFF

ENABLE

DP, DM

IDLE

SYNC

PID

IDLE

EOP

DATA PAYLOAD

004aab125

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