Philips Semiconductors
ISP1561
USB PCI host controller
Pin description
…continued
Pin
126
Type
I/O
Description
amber LED indicator output for the USB downstream port 4
(open-drain); this pin acts as an input only during the
power-up sequence and thereafter, acts as an output.
Bi-directional pin; push-pull input; three-state output; 10 ns
slew rate control; TTL; 5 V tolerant
1 —
FF in PMC register; supports D3
cold
0 —
EF in PMC register; does not support D3
cold
Table 2:
Symbol
[1]
AMB4
GRN4
127
I/O
green LED indicator output for the USB downstream port 4
(open-drain) The LED is OFF by default; the LED can be
programmed to enable it to blink. Bi-directional pin;
push-pull input; three-state output; 10 ns slew rate control;
TTL; 5 V tolerant
digital ground
DGND
[1]
[2]
[3]
128
-
Symbol names ending with a ‘#’ (for example, NAME#) represent active LOW signals for PCI pins.
Symbol names with an overscore (for example, NAME) represent active LOW signals for USB pins.
The pull-up resistor should be always present even if I
2
C EEPROM is not used.
If legacy support is not used, connect this pin to ground.
9397 750 10015
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Product data
Rev. 01 — 06 February 2003
12 of 102
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