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ISP1582

Hi-Speed Universal Serial Bus peripheral controller

Philips Electronics 

Philips Semiconductors

ISP1582

Hi-Speed USB peripheral controller

9397 750 13699

Preliminary data

8.2 Hi-Speed USB transceiver

The analog transceiver directly interfaces to the USB cable through integrated

termination resistors. The high-speed transceiver requires an external resistor

(12.0 kΩ ± 1 %) between pin RREF and ground to ensure an accurate current mirror

that generates the Hi-Speed USB current drive. A full-speed transceiver is integrated

as well. This makes the ISP1582 compliant to Hi-Speed USB and Original USB,

supporting both the high-speed and full-speed physical layers. After automatic speed

detection, the Philips Serial Interface Engine (SIE) sets the transceiver to use either

high-speed or full-speed signaling.

8.3 MMU and integrated RAM

The Memory Management Unit (MMU) and the integrated RAM provide the

conversion between the USB speed (full-speed: 12 Mbit/s, high-speed: 480 Mbit/s)

and the microcontroller handler or the DMA handler. The data from the USB bus is

stored in the integrated RAM, which is cleared only when the microcontroller has read

or written all data from or to the corresponding endpoint buffer or when the DMA

handler has read or written all data from or to the endpoint buffer. The OUT endpoint

buffer can also be cleared forcibly by setting bit CLBUF in the Control Function

register. A total of 8 kbytes RAM is available for buffering.

8.4 Microcontroller interface and microcontroller handler

The microcontroller handler allows the external microcontroller or microprocessor to

access the register set in the Philips SIE as well as the DMA handler. The

initialization of the DMA configuration is done through the microcontroller handler.

8.5 OTG SRP module

The OTG supplement defines a Session Request Protocol (SRP), which allows a

B-device to request the A-device to turn on VBUS and start a session. This protocol

allows the A-device, which may be battery-powered, to conserve power by turning off

VBUS when there is no bus activity while still providing a means for the B-device to

initiate bus activity.

Any A-device, including a PC or laptop, can respond to SRP. Any B-device, including

a standard USB peripheral, can initiate SRP.

The ISP1582 is a device that can initiate SRP.

8.6 Philips high-speed transceiver

8.6.1 Philips Parallel Interface Engine (PIE)

In the high-speed (HS) transceiver, the Philips PIE interface uses a 16-bit parallel

bidirectional data interface. The functions of the HS module also include bit-stuffing or

destuffing and Non-Return-to-Zero Inverted (NRZI) encoding or decoding logic.

8.6.2 Peripheral circuit

To maintain a constant current driver for HS transmit circuits and to bias other analog

circuits, an internal band gap reference circuit and an RREF resistor form the

reference current. This circuit requires an external precision resistor (12.0 kΩ ± 1 %)

connected to the analog ground.

Rev. 03 — 25 August 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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