Philips ISP1520 사용자 설명서

9397 750 13701

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

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

2

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

as a slave.

 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).

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

CC

 (3.3 V) starting from the highest port number (4).

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

Number of downstream
facing ports

2 ports
3 ports
4 ports

DM1/DP1 to
DM4/DP4

see

bNbrPorts0

see

Power switching mode

ganged
multiple ganged

individual

PSW1_N to
PSW4_N

see

wHubCharacteristics:
bits D1 and D0

see

bPwrOn2PwrGood:
time interval

Overcurrent protection
mode

none
global

multiple ganged
individual

NOOC and
OC1_N to
OC4_N

see

wHubCharacteristics:
bits D4 and D3

see

Non-removable ports

any port can be
non-removable

AMBn_N

see

wHubCharacteristics:
bit D2 (compound hub)

see

DeviceRemovable:
bit map

Port indicator support

no
yes

all GRNn_N

see

wHubCharacteristics:
bit D7

see

4

15 k

Ω

pull-down

15 k

Ω

pull-down

15 k

Ω

pull-down

15 k

Ω

pull-down

3

15 k

Ω

pull-down

15 k

Ω

pull-down

15 k

Ω

pull-down

V

CC

2

15 k

Ω

pull-down

15 k

Ω

pull-down

V

CC

V

CC