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ISP1104

Advanced Universal Serial Bus transceiver

Philips Electronics 

Philips Semiconductors

ISP1104

Advanced USB transceiver

7. Functional description

7.1 Function selection

Table 3: Function table

SUSPND OE

D+ and D−

L

L

driving/

receiving

L

H

receiving[1]

H

L

driving

RCV

active

VP/VM

active

active

active

inactive[2] active

H

H

high-Z[1]

inactive[2] active

Function

normal driving

(differential receiver active)

receiving

driving during ‘suspend’

(differential receiver inactive)

low-power state

[1] Signal levels on pins D+ and D− are determined by other USB devices and external pull-up or

pull-down resistors.

[2] In the suspend mode (pin SUSPND = HIGH), the differential receiver is inactive and the output RCV is

always LOW. Out-of-suspend (K) signalling is detected via the single-ended receivers VP and VM.

7.2 Operating functions

Table 4:

FSE0

L

L

H

H

Driving function using single-ended input data interface (pin OE = L and

pin MODE = L)

VO

Data

L

differential logic 0

H

differential logic 1

L

SE0

H

SE0

Table 5:

VMO

L

L

H

H

Driving function using differential input data interface (pin OE = L and

pin MODE = H)

VPO

Data

L

SE0

H

differential logic 1

L

differential logic 0

H

illegal state

Table 6: Receiving function (pin OE = H)

D+ and D−

RCV

differential logic 0

L

differential logic 1

H

SE0

RCV*[2]

VP[1]

L

H

L

VM[1]

H

L

L

[1] VP = VM = H indicates the sharing mode (VCC(5.0) is disconnected).

[2] RCV* denotes the signal level on output RCV just before the SE0 state occurs. This level is stable

during the SE0 period.

9397 750 11229

Product data

Rev. 02 — 14 October 2003

© Koninklijke Philips Electronics N.V. 2003. All rights reserved.

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