CONTROLLING INPUT/OUTPUT PAD DISCHARGE RATE IN STORAGE DEVICES
A transmitter controls the fall time on an open-drain link including multiple components. The transmitter includes an input driver to receive data and transmit the data on the open-drain link, thereby activating the open-drain link. The transmitter also includes a feedback mechanism to keep track of a pad when the open-drain link is activated and to determine when the pad reaches a predetermined amount of a supply voltage. When the pad reaches the predetermined amount of a supply voltage, the feedback mechanism triggers an appropriate main pull-down driver to control the fall time.
1 . A transmitter controls a fall time on an open-drain link including multiple components, the transmitter comprises:
an input driver to receive data and transmit the data on the open-drain link, thereby activating the open-drain link; and
a feedback mechanism to keep track of a pad when the open-drain link is activated and when the pad reaches a predetermined amount of a supply voltage, the feedback mechanism triggers an appropriate main pull-down driver to control the fall time.
2 . The transmitter of claim 1 , wherein the input driver is a 0.5 mA driver.
3 . The transmitter of claim 1 , wherein the feedback mechanism is a Schmitt trigger circuitry.
4 . The transmitter of claim 1 , wherein the feedback mechanism uses about 50 micro amp (uA) of static current.
5 . The transmitter of claim 1 , wherein when the pad reaches the predetermined amount of the supply voltage, the feedback mechanism sends a trigger to a pre-driver to trigger the appropriate main pull-down driver to control the fall time.
6 . The transmitter of claim 1 , wherein the predetermined amount of the supply voltage is 0.4 of the supply voltage.
7 . The transmitter of claim 1 , wherein the supply voltage is one of 1.8 volts and 3.3 volts.
8 . The transmitter of claim 1 , wherein the main pull-down driver is a 3 milli ampere (mA), 6 mA, and 9 mA driver.
9 . The transmitter of claim 1 , wherein when input data arrives, a 0.5 mA pull-down leg is turned on which reduces the pad voltage.
10 . The transmitter of claim 1 , wherein the transmitter is independent of the supply voltage.
11 . The transmitter of claim 1 , wherein the pad is discharged through a 1.5 KΩ poly linear resistor.
12 . The transmitter of claim 1 , wherein the open-drain link connects a storage device to multiple devices.
13 . A method in a transmitter for controlling a fall time on an open-drain link including multiple components, the method comprises:
transmitting data on the open-drain link through an input driver;
activating the open-drain link;
tracking voltage of a pad on the activated open-drain line; and
triggering an appropriate main pull-down driver to control the fall time when the pad reaches a predetermined amount of a supply voltage.
14 . A transmitter for controlling a fall time on an open-drain link including multiple components, the transmitter comprising:
an input driver to receive data and transmit the data on the open-drain link, thereby activating the open-drain link;
a feedback mechanism to keep track of a pad when the open-drain link is activated and determine when the pad reaches a predetermined amount of a supply voltage;
a pre-driver to receive a trigger from the feedback mechanism; and
a main pull-down driver to receive the trigger from the pre-driver to trigger an appropriate leg of the main pull-down driver and control the fall time.