CN209297245U - A kind of control chip power breaking device - Google Patents

Abstract

The utility model provides a kind of control chip power breaking device and its operating method.The control chip power breaking device includes control register, logic control circuit and power switch, pass through serial mode during power switch, electric power starting or closing are carried out to the power domain that need to be controlled, after the completion of previous power switching operations, start the latter power switch, multiple power switches can be controlled, and avoid operating caused rush of current simultaneously；Meanwhile the utility model is also equipped with power supply domain switch selection function, selects the power domain to be turned off or on by specified register, under the configuration of specified register, it is turned on or off the power domain chosen in succession, to reduce chip overall power, and achievees the purpose that reduce transient current impact.

Description

A kind of control chip power breaking device

Technical field

The utility model relates to Integrated circuit digital design fields more particularly to a kind of control chip power to cut-off Device.

Background technique

Requirement with consumer electronics to power consumption is increasingly stringent, and Low-power Technology is essential one on SOC design Link.Mature Low-power Technology includes gating technology at present, multi-Vt technology, power remove technology etc..Wherein power supply The technology of turning off is that its power supply is turned off when part number logic does not need work, to achieve the purpose that save power consumption.

As shown in Figure 1, being existing chip power breaking device structure chart.The function of power switching devices is to receive electricity After the enable signal of source, the module device power supply VCC being attached thereto is opened.Each power domain has independent request signal (pw_ ) and response signal (pw_gating_ack) gating_req.Such as: the b1 of pw_gating_req=1 ' represents power supply turn-off request； The b1 of pw_gating_ack=1 ' represents power operation and completes, mutually indepedent between each power switch.When multiple power supplys are opened simultaneously When opening or closing, such as: chip, which wakes up from suspend mode while opening goods, closes power supply, will cause rush of current, not only expend Power supply, and the device in chip can be damaged.

Utility model content

In view of the above-mentioned deficiencies in the prior art, the purpose of the utility model is to provide a kind of control chip powers to open Disconnected device carries out electric power starting or closing to the power domain that need to be controlled, and have by serial mode during power switch Power supply domain switch selection function selects the power domain to be turned off or on by specified register, to reduce chip entirety function Consumption reduces transient current impact.

In order to reach above-mentioned technical purpose, the technical scheme adopted by the utility model is

A kind of control chip power breaking device, which is characterized in that the power supply breaking device includes control register, patrols Collect control circuit and power switch, wherein control register includes N number of specified register；2≤N≤6；Specified register connection Logic control circuit, logic control circuit out-put supply；

Specified register includes writing enabled generation circuit, selector and d type flip flop, writes enabled generation circuit connection selection Device, selector connect d type flip flop；

Logic control circuit includes N number of power request generation circuit and N number of power switch, N number of power request generation circuit N number of power switch is successively corresponded and connects, N number of power switch exports respective power supply respectively；

N number of d type flip flop in N number of specified register successively corresponds and connects N number of power request generation circuit；

The power supply breaking device work when, external write signal sfr_wr and address signal sfr_addr input write it is enabled Generation circuit, when address signal sfr_addr is equal to the address specified register SFRPD and write signal sfr_wr is high level, Enabled generation circuit output write enable signal wr is write, write enable signal wr signal enters selector and judged；If judgement, which is write, to be made Energy signal wr is effective, and external input write data signal sfr_wdata passes through selector and reaches D triggering in specified register SFRPD The port D of device, then the port Q of d type flip flop exports the control signal of specified register；If judging, write enable signal wr is invalid, In specified register SFRPD the port Q of d type flip flop make write enable signal wr by selector reach d type flip flop the port D, The then control signal of the port the Q output specified register of d type flip flop；

The control signal of specified register SFRPD output reaches one-to-one power request in logic control circuit and generates Circuit, power request generation circuit REG_GEN generate corresponding power request signal pw_gating_req, and corresponding power supply is asked It asks signal pw_gating_req to enter and controls corresponding power switch PW, corresponding power switch PW shutdown or unlatching are corresponding Power supply VCC after the completion of, corresponding power switch PW generates corresponding power supply answer signal pw_gateing_ack signal；

External input reset signal Reset is enabled, then the d type flip flop of specified register SFRPD resets.

The control chip power breaking device of the utility model is due to using above-mentioned control register, logic control circuit With the structure of power switch, beneficial effect obtained is, by serial mode during power switch, to the electricity that need to be controlled Source domain carries out electric power starting or closing, after the completion of previous power switching operations, starts the latter power switch, it can control Multiple power switches, and avoid operating caused rush of current simultaneously；Meanwhile the utility model is also equipped with the selection of power supply domain switch Function, by specified register select the power domain to be turned off or on, under the configuration of specified register, in succession open or The power domain chosen is closed, to reduce chip overall power, and achievees the purpose that reduce transient current impact.

The utility model is described further with reference to the accompanying drawings and detailed description.

Detailed description of the invention

Fig. 1 is existing chip power breaking device structure chart.

Fig. 2 is the control chip power breaking device structure chart of the utility model specific implementation.

Fig. 3 is the specified register structure chart of the utility model specific implementation.

Specific embodiment

Referring to Fig. 2, for the control chip power breaking device structure chart of the utility model specific implementation；The control chip electricity Source breaking device includes control register, logic control circuit and power switch, wherein control register includes N number of special posts Storage；2≤N≤6；Specified register connects logic control circuit, logic control circuit out-put supply.Referring to Fig. 3, practical for this The specified register structure chart of novel specific implementation；The specified register includes writing enabled generation circuit, selector and D triggering Device, writes enabled generation circuit connection selector, and selector connects d type flip flop；The logic control circuit includes that N number of power request produces Raw circuit and N number of power switch, N number of power request generation circuit successively correspond and connect N number of power switch, N number of power supply Switch exports respective power supply respectively；N number of d type flip flop in N number of specified register successively corresponds and connects N number of power request Generation circuit.

Referring to shown in Fig. 2 and Fig. 3, when the power supply breaking device works, external write signal sfr_wr and address signal Enabled generation circuit is write in sfr_addr input, when address signal sfr_addr is equal to the address specified register SFRPD and writes letter When number sfr_wr is high level, enabled generation circuit output write enable signal wr is write, write enable signal wr signal enters selector Judged；If judging, write enable signal wr is effective, and it is special that external input write data signal sfr_wdata is reached by selector The port D of d type flip flop in register SFRPD, then the port Q of d type flip flop exports the control signal of specified register；If judgement is write Enable signal wr is invalid, then the port Q of d type flip flop arrives write enable signal wr by selector in specified register SFRPD Up to the port D of d type flip flop, then the port Q of d type flip flop exports the control signal of specified register；Specified register SFRPD output Control signal reach one-to-one power request generation circuit, power request generation circuit REG_ in logic control circuit GEN generates corresponding power request signal pw_gating_req, and corresponding power request signal pw_gating_req enters simultaneously Corresponding power switch PW is controlled, after the completion of corresponding power switch PW is turned off or is opened corresponding power supply VCC, corresponding power supply Switch PW generates corresponding power supply answer signal pw_gateing_ack signal；External input reset signal Reset is enabled, then special The d type flip flop of different register SFRPD resets.

The switch of power domain may be selected in the utility model, moreover, selected power domain operation can be held in sequence Row so that reaching reduces chip overall power, and reduces the effect of transient current impact.

It should be noted that above embodiment only illustrates the basic ideas of the utility model in a schematic way, with this reality Built-up circuit number, shape, device arrangement mode when with related built-up circuit in novel rather than according to actual implementation, connection Mode is drawn.Kenel, quantity, connection type, device arrangement mode, the device parameters of each circuit can be random when its actual implementation Change.

Embodiment described above is only the utility model preferred embodiment, cannot limit the utility model technology The extension of scheme.All those skilled in the art's made any well-known techniques on the basis of technical solutions of the utility model that belongs to are repaired Change, equivalent variations and it is obvious change etc., all should belong to the protection range of the utility model within.

Claims (1)

1. a kind of control chip power breaking device, which is characterized in that the power supply breaking device includes control register, logic Control circuit and power switch, wherein control register includes N number of specified register；2≤N≤6；Specified register connection is patrolled Collect control circuit, logic control circuit out-put supply；

Specified register includes writing enabled generation circuit, selector and d type flip flop, writes enabled generation circuit connection selector, choosing Select device connection d type flip flop；

Logic control circuit includes N number of power request generation circuit and N number of power switch, and N number of power request generation circuit is successively N number of power switch is corresponded and connects, N number of power switch exports respective power supply respectively；

N number of d type flip flop in N number of specified register successively corresponds and connects N number of power request generation circuit；

When the power supply breaking device works, enabled generation is write in external write signal sfr_wr and address signal sfr_addr input Circuit, when address signal sfr_addr is equal to the address specified register SFRPD and write signal sfr_wr is high level, writing makes Energy generation circuit exports write enable signal wr, and write enable signal wr signal enters selector and judged；If enabled letter is write in judgement Number wr is effective, and external input write data signal sfr_wdata passes through the D that selector reaches d type flip flop in specified register SFRPD Port, then the port Q of d type flip flop exports the control signal of specified register；If judging, write enable signal wr is invalid, special to post The port Q of d type flip flop makes write enable signal wr reach the port D of d type flip flop by selector in storage SFRPD, then D is triggered The control signal of the port the Q output specified register of device；

The control signal of specified register SFRPD output reaches one-to-one power request in logic control circuit and generates electricity Road, power request generation circuit REG_GEN generate corresponding power request signal pw_gating_req, corresponding power request Signal pw_gating_req enters and controls corresponding power switch PW, and corresponding power switch PW shutdown or unlatching are corresponding After the completion of power supply VCC, corresponding power switch PW generates corresponding power supply answer signal pw_gateing_ack signal；

External input reset signal Reset is enabled, then the d type flip flop of specified register SFRPD resets.