ISP1520 Просмотр технического описания (PDF) - Philips Electronics

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ISP1520

Hi-Speed Universal Serial Bus hub controller

Philips Electronics 

Philips Semiconductors

ISP1520

Hi-Speed USB hub controller

9. Configuration selections

The ISP1520 is configured through I/O pins and, optionally, through an external

I2C-bus, in which case the hub can update its configuration descriptors as a master or

as a slave.

Table 3 shows the configuration parameters.

Table 3: Configuration parameters

Mode and selection Option

Number of downstream 2 ports

facing ports

3 ports

4 ports

Power switching mode ganged

multiple ganged[1]

individual

Overcurrent protection

mode

Non-removable ports

none

global[2]

multiple ganged

individual

any port can be

non-removable

Port indicator support no

yes

Configuration method

Pin control

Control pin

Reference

DM1/DP1 to

DM4/DP4

see Section 9.1.1

PSW1_N to

PSW4_N

see Section 9.1.2

NOOC and

OC1_N to

OC4_N

AMBn_N

see Section 9.1.3

see Section 9.1.4

all GRNn_N

see Section 9.1.5

Software control

Affected field

bNbrPorts0

Reference

see Table 22

wHubCharacteristics:

bits D1 and D0

bPwrOn2PwrGood:

time interval

wHubCharacteristics:

bits D4 and D3

see Table 22

see Table 22

wHubCharacteristics: see Table 22

bit D2 (compound hub)

DeviceRemovable:

bit map

wHubCharacteristics: see Table 22

bit D7

[1] Multiple ganged power mode is reported as individual power mode; refer to the USB 2.0 specification.

[2] When the hub uses the global overcurrent protection mode, the overcurrent indication is through the wHubStatus field bit 1 (overcurrent)

and the corresponding change bit (overcurrent change).

9397 750 11689

Product data

9.1 Configuration through I/O pins

9.1.1 Number of downstream facing ports

To discount a physical downstream facing port, connect pins DP and DM of that

downstream facing port to VCC (3.3 V) starting from the highest port number (4).

The sum of physical ports configured is reflected in the bNbrPorts field.

Table 4: Downstream facing port number pin configuration

Number of physical

DM1/DP1

downstream facing port

DM2/DP2

DM3/DP3

4

15 kΩ

15 kΩ

15 kΩ

pull-down

pull-down

pull-down

3

15 kΩ

15 kΩ

15 kΩ

pull-down

pull-down

pull-down

2

15 kΩ

15 kΩ

VCC

pull-down

pull-down

DM4/DP4

15 kΩ

pull-down

VCC

VCC

Rev. 02 — 04 May 2004

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

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