Serial device daisy chaining method and apparatus
First Claim
Patent Images
1. A method comprising the steps of:
- serially clocking a mask value through a plurality of serially coupled subscriber line interface circuits (SLICs) until each SLIC stores a corresponding portion of the mask value; and
serially communicating a command to the plurality of SLICs, wherein each SLIC responds to the command only if enabled by the corresponding portion of the mask value.
0 Assignments
0 Petitions
Accused Products
Abstract
A method includes the step of serially clocking a mask value through a plurality of subscriber line interface circuits (SLICs) until each SLIC stores a corresponding portion of the mask value, and serially communicating a command to the plurality of SLICs. Each SLIC responds to the command only if enabled by the corresponding portion of the mask value.
-
Citations
20 Claims
-
1. A method comprising the steps of:
-
serially clocking a mask value through a plurality of serially coupled subscriber line interface circuits (SLICs) until each SLIC stores a corresponding portion of the mask value; and
serially communicating a command to the plurality of SLICs, wherein each SLIC responds to the command only if enabled by the corresponding portion of the mask value. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method comprising the steps of:
-
initializing a plurality of subscriber line interface circuits (SLICs) to one of a first mode and a second mode;
serially clocking a mask value through the plurality of SLICs until each SLIC stores a corresponding portion of the mask value, if the plurality of SLICs is in the second mode; and
serially communicating a command to the plurality of SLICs, wherein every SLIC responds to the command when in the first mode, wherein only SLICs enabled by the corresponding portion of the mask value respond to the command when in the second mode. - View Dependent Claims (7, 8, 9, 10)
-
-
11. An apparatus comprising:
-
a bus master;
a plurality of subscriber line interface circuits (SLICs); and
a bus coupling the serial devices to the bus master, wherein the bus master serially clocks a mask value through the plurality of serial devices until each serial device stores a portion of the mask value, wherein each of the plurality of serial devices responds to a subsequent command serially communicated by the bus master only if enabled by the corresponding portion of the mask value. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A subscriber line interface circuit (SLIC) apparatus comprising:
-
a memory coupled to receive a clock signal and a serial data in (SDI) signal carrying mask values, commands, and data, wherein the memory provides a clocked SDI signal;
a mode control providing a mode control signal; and
a multiplexer coupled to select one of the SDI signal and the clocked SDI signal as an SDI THRU signal in accordance with the mode control signal, wherein responsive to the mode control signal the multiplexer selects the clocked SDI signal as the SDI THRU signal when the SDI signal carries the mask value, wherein the multiplexer selects the SDI signal when the SDI signal carries commands or data. - View Dependent Claims (17, 18, 19, 20)
-
Specification