Unlock instant, AI-driven research and patent intelligence for your innovation.

A System Using Latches to Transmit Signals Across Clock Domains

A cross-clock domain and signal transmission technology, which is applied in the system field of using latches to realize cross-clock domain signal transmission, can solve the lack of cross-clock domain signal transmission technology and other problems

Active Publication Date: 2020-03-31
SHANGHAI FUDAN MICROELECTRONICS GROUP
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The essence of the above-mentioned existing methods is to transmit the clock signal in a synchronous manner, and lacks a cross-clock domain signal transmission technology that expands the pulse width in an asynchronous manner

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A System Using Latches to Transmit Signals Across Clock Domains
  • A System Using Latches to Transmit Signals Across Clock Domains
  • A System Using Latches to Transmit Signals Across Clock Domains

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The system of the present invention adopts a latch (latch) with simultaneous asynchronous setting (set) and reset (reset) to realize signal cross-clock domain transmission.

[0021] see figure 1 , figure 2 And as shown in Table 1, a latch is provided in the system of the present invention, which includes a set-reset latch module (set-reset latch), and the set-reset latch module has a set terminal lat_set_b, a reset terminal lat_rst_b, output terminal q, clock signal input terminal CK; wherein, the clock signal input terminal CK inputs the clock signal aclk of the slow clock domain; the output terminal q is also used as the output terminal of the entire latch, and its output signal den_latch is sent to a The three-bit register den_pipe[2:0] composed of D flip-flops.

[0022] The latch also has a first input terminal rst1_b for active low reset, whose input is the signal cfg_reset_b triggered by a falling edge; a second input terminal set2 for active high reset, whose ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a system of utilizing a latch to realize cross-clock-domain signal transmission. The latch using a first-clock-domain clock aclk is disposed. A to-be-transmitted signal den isinput into the latch to enable the latch to be set; a signal den_latch output by the latch is connected to a three-bit register den_pipe [2:0]; and a signal output by a first bit den_pipe [1] of theregister is used as a clearing signal of the latch to be input into the latch to enable the same to be reset. The signal dre_aclk output at the first bit den_pipe [1] of the register is connected to an input port of an AND gate through an NOT gate; a signal output at a 0-th bit den_pipe [0] of the register is connected to the other input port of the AND gate; and a signal drdy_aclk corresponding to a second-clock-domain clock is obtained at an output port of the AND gate. The system is simple in a structure, and is suitable for use in cross-clock-domain pulse signal transmission of entering alow-frequency clock domain by the high-frequency signal.

Description

technical field [0001] The invention relates to a cross-clock domain signal transmission technology, in particular to a system for realizing cross-clock domain signal transmission by using a latch. Background technique [0002] The existing cross-clock domain signal processing can be divided into the following methods: [0003] 1) Take two beats with registers: This method is only suitable for signals crossing from low-frequency clocks to high-frequency clocks. [0004] 2) Use a counter to properly widen the high-frequency signal so that its width is greater than one period of the low-frequency clock: the essence of this method is to reduce the clock frequency, and first reduce the frequency of the signal generated by the high-frequency clock. Reduced to lower than the original low frequency clock. This method is only applicable if the frequency relationship of each other is known. [0005] 3) Use handshake signals, RAM and fifo: use the handshake protocol to process cros...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06F13/20
CPCG06F13/20
Inventor 赵金薇丁世勇潘向昱陈惠威黄高中
Owner SHANGHAI FUDAN MICROELECTRONICS GROUP