ISP1563 Просмотр технического описания (PDF) - Philips Electronics

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ISP1563

Hi-Speed Universal Serial Bus PCI Host Controller

Philips Electronics 

Philips Semiconductors

ISP1563

HS USB PCI Host Controller

7.7 Legacy support

The ISP1563 provides legacy support for a USB keyboard and mouse. This means that

the keyboard and mouse should be able to work even before the Operating System (OS)

boot-up, with the necessary support in the Basic Input Output System (BIOS).

Section 11.2 provides a detailed description on the legacy support in the ISP1563.

7.8 Phase-Locked Loop (PLL)

A 12 MHz-to-30 MHz and 48 MHz clock multiplier PLL is integrated on-chip. This allows

the use of a low-cost 12 MHz crystal, which also minimizes EMI. No external components

are required for the PLL to operate.

7.9 Power-On Reset (POR)

Figure 3 shows a possible curve of VCC(I/O) with dips at t2 to t3 and t4 to t5. At t0, POR will

start with 1. At t1, the detector passes through the trip level. Another delay will be added

before POR drops to 0 to ensure that the length of the generated detector pulse, POR, is

large enough to reset asynchronous flip-flops. If the dip is too short (t4 to t5 < 11 µs),

POR will not react and will stay LOW.

t0

t1

t2

t3

VPOR(trip) is typically 1.2 V.

Fig 3. Power-on reset.

VCC(I/O)

VPOR(trip)

t4 t5

POR

004aaa664

7.10 Power supply

Figure 4 shows the ISP1563 power supply connection.

9397 750 14224

Product data sheet

Rev. 01 — 14 July 2005

© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

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