isp1520 NXP Semiconductors, isp1520 Datasheet - Page 11

• Manufacturer Part Number: isp1520
• Description: Hi-speed Universal Serial Bus Hub Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
8. Configuration selections
Table 3.
[1]
[2]
ISP1520_4
Product data sheet
Mode and selection
Number of downstream
facing ports
Power switching mode
Overcurrent protection
mode
Nonremovable ports
Port indicator support
Multiple ganged power mode is reported as individual power mode; refer to Universal Serial Bus Specification Rev. 2.0 .
When the hub uses global overcurrent protection mode, the overcurrent indication is through wHubStatus field bit 1 (overcurrent) and
the corresponding change bit (overcurrent change).
Configuration parameters
8.1.1 Number of downstream facing ports
8.1 Configuration through I/O pins
The ISP1520 is configured through I/O pins and, optionally, through an external I
in which case the hub can update its configuration descriptors as a master or as a slave.
Table 3
To discount a physical downstream facing port, connect pins DP and DM of that
downstream facing port to V
Table
The sum of physical ports configured is reflected in the bNbrPorts field.
Option
2 ports
3 ports
4 ports
ganged
multiple ganged
individual
none
global
multiple ganged
individual
any port can be
nonremovable
no
yes
[2]
4.
shows configuration parameters.
[1]
Configuration method
Pin control
Control pin
DM1/DP1 to
DM4/DP4
PSW1_N to
PSW4_N
NOOC and
OC1_N to
OC4_N
AMBn_N
all GRNn_N
Rev. 04 — 28 April 2006
CC
(3.3 V), starting from the highest port number (4), see
Reference
see
see
see
see
see
Section 8.1.1
Section 8.1.2
Section 8.1.3
Section 8.1.4
Section 8.1.5
Software control
Affected field
bNbrPorts0
wHubCharacteristics:
bits D1 and D0
bPwrOn2PwrGood:
time interval
wHubCharacteristics:
bits D4 and D3
wHubCharacteristics:
bit D2 (compound hub)
DeviceRemovable:
bit map
wHubCharacteristics:
bit D7
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Hi-Speed USB hub controller
ISP1520
Reference
see
see
see
see
see
Table 22
Table 22
Table 22
Table 22
Table 22
2
C-bus,
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