ISP1521 Просмотр технического описания (PDF) - Philips Electronics

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ISP1521

Hi-Speed Universal Serial Bus hub controller

Philips Electronics 

Philips Semiconductors

ISP1521

Hi-Speed USB hub controller

9. Configuration selections

The ISP1521 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

facing ports

2 ports

3 ports

4 ports

5 ports

6 ports

7 ports

Power switching mode

none

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

DM7/DP7

see Section 9.1.1

PSW1_N to

PSW7_N

see Section 9.1.2

NOOC and

OC1_N to

OC7_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 13702

Product data

Rev. 03 — 24 November 2004

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

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