Philips Semiconductors

ISP1521

Hi-Speed USB hub controller

Product data

Rev. 03 — 24 November 2004

13 of 53

9397 750 13702

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

9.

Configuration selections

The ISP1521 is configured through I/O pins and, optionally, through an external

as a slave.

Table 3 shows the configuration parameters.

[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).

Table 3:

Configuration parameters

Mode and selection

Option

Configuration method

Pin control

Software control

Control pin

Reference

Affected field

Reference

Number of downstream

facing ports

2 ports

3 ports

4 ports

5 ports

6 ports

7 ports

DM1/DP1 to

DM7/DP7

see Section 9.1.1

bNbrPorts0

see Table 22

Power switching mode

none

ganged

multiple ganged[1]

individual

PSW1_N to

PSW7_N

see Section 9.1.2

wHubCharacteristics:

bits D1 and D0

see Table 22

bPwrOn2PwrGood:

time interval

Overcurrent protection

mode

none

global[2]

multiple ganged

individual

NOOC and

OC1_N to

OC7_N

see Section 9.1.3

wHubCharacteristics:

bits D4 and D3

see Table 22

Non-removable ports

any port can be

non-removable

AMBn_N

see Section 9.1.4

wHubCharacteristics:

bit D2 (compound hub)

see Table 22

DeviceRemovable:

bit map

Port indicator support

no

yes

all GRNn_N

see Section 9.1.5

wHubCharacteristics:

bit D7

see Table 22