CN205881467U - Both ends mouth static RAM unit - Google Patents
Both ends mouth static RAM unit Download PDFInfo
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- CN205881467U CN205881467U CN201620787252.8U CN201620787252U CN205881467U CN 205881467 U CN205881467 U CN 205881467U CN 201620787252 U CN201620787252 U CN 201620787252U CN 205881467 U CN205881467 U CN 205881467U
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Abstract
The utility model relates to a both ends mouth static RAM unit, phase inverter no. 1 including cross coupling, phase inverter no. 2, NMOS transistor N6, NMOS transistor N7 and read the port, write the bars end that word line WWL connects NMOS transistor N6 and NMOS transistor N7, NMOS transistor N7's drain terminal, the input of phase inverter no. 1 and the output of phase inverter no. 2 are connected in the anti - BITB of memory node, the output of phase inverter no. 1, NMOS transistor N6's the drain terminal and the input of phase inverter no. 2 are all connected in memory node BIT, the anti - WBLB of bit line is write to NMOS transistor N7's source termination, bit line WBL is write to NMOS transistor N6's source termination, it includes at least one NMOS transistor to read the port. The problem of the current big technique of two fracture static RAM domain areas is solved, the utility model discloses a reduce the quantity of transistor, reduce the domain area.
Description
Technical field
This utility model relates to SRAM design field, particularly to a kind of two-port SRAM
Unit.
Background technology
SRAM is as the important memory element in integrated circuit, due to its high-performance, high reliability is low
The advantages such as power consumption are widely used in high-performance calculation device system (CPU), SOC(system on a chip) (SOC), and handheld device etc. calculates neck
Territory.According to the estimation of ITRS ITRS, by 2018, Embedded SRAM area accounts for whole
Individual computer system (CPU), more than the 90% of SOC(system on a chip) (SOC) area.Two-port SRAM as static state with
The one of machine memorizer, it supports that the read operation of a port and the write operation of a port are carried out simultaneously.Two-port static with
Machine memory cell is most important ingredient in two-port SRAM, accounts for the storage of whole two-port static random
More than the 70% of device area.Two-port static random access memory cell is at traditional single port 6 pipe static ram cell
On the basis of, adding what special read port realized, its implementation includes that single-ended reading or both-end are read.The advantage that both-end is read
It is to use sense amplifier that the small signal difference of two sense bit lines is amplified, and without necessarily referring to bit line.Phase
Ratio, in single-ended reading, has speed fast, and power consumption is little, the simple advantage of peripheral circuit.
The two-port static random access memory cell schematic diagram read such as the 10 pipe both-ends that Fig. 1, Fig. 1 are prior art, including
Cross-linked phase inverter 101, phase inverter 102, nmos pass transistor N0-N5.
Memory node BIT connects input and the output of phase inverter 101 of phase inverter 102, is also connected with nmos pass transistor N0's
The grid end of drain terminal and nmos pass transistor N2.The anti-BITB of memory node connects input and the output of phase inverter 102 of phase inverter 101,
It is also connected with the drain terminal of nmos pass transistor N1 and the grid end of nmos pass transistor N4.Write word line WWL connects the grid of nmos pass transistor N0, N1
End.The anti-WBLB of write bit line connects the source of nmos pass transistor N1.Write bit line WBL connects the source of nmos pass transistor N0.Readout word line
RWL connects the grid end of nmos pass transistor N3, N5.The anti-RBLB of sense bit line connects the drain terminal of nmos pass transistor N5.Sense bit line RBL connects
The drain terminal of nmos pass transistor N3.Ground connection GND connects the source of nmos pass transistor N3, N5.S0 connects the drain terminal of nmos pass transistor N2
Source with nmos pass transistor N3.S1 connects drain terminal and the source of nmos pass transistor N5 of nmos pass transistor N4.
Its operation principle is as follows:
When keeping pattern, sense bit line RBL and the anti-RBLB of sense bit line is precharged to supply voltage VDD.Readout word line RWL is
Low, N3 and N5 turns off.According to being stored in memory node BIT and the anti-BITB of memory node value, N2 and N4 on and off.When
Memory node BIT is " 0 ", and when the anti-BITB of memory node is " 1 ", N2 turns off, and N4 turns on.When memory node BIT is " 1 ", storage
When the anti-BITB of node is " 0 ", N4 turns off, and N2 turns on.
When read operation, sense bit line RBL and sense bit line anti-RBLB floating.For selected memory element, readout word line RWL
Draw high.N3 and N5 opens.According to being stored in memory node BIT and the anti-BITB of memory node value, by N2 or N4 to read bit
Line RBL or sense bit line anti-RBLB electric discharge.When memory node BIT is " 0 ", and the anti-BITB of memory node is " 1 ", N2 turns off, and N4 leads
Logical.Discharged by series winding N4 and N5 RBLB anti-to sense bit line.Owing to N2 turns off, sense bit line RBL is maintained at supply voltage VDD.When
Memory node BIT is " 1 ", and when the anti-BITB of memory node is " 0 ", N4 turns off, and N2 turns on.By series winding N2 and N3 to sense bit line
RBL discharges.Owing to N4 turns off, the anti-RBLB of sense bit line is maintained at supply voltage VDD.Voltage difference on sense bit line RBL and RBLB
When Δ RBL reaches the offset voltage of sense amplifier, the small signal difference of sense bit line RBL and RBLB is amplified by sense amplifier
Become full swing.As in figure 2 it is shown, the two-port static random access memory cell domain that the 10 pipe both-ends that Fig. 2 is prior art are read.From
Include down metal level, layer inner via hole layer, polysilicon layer, active region layer, N implanted layer, and P implanted layer.Each layer uses difference
Filling figure carry out labelling.
BITB polysilicon 11 and N4 active area 10 below form nmos pass transistor N4.N4 active area is by GND layer
The left 12 and GND metal left sides 13 of through hole are linked up.GND metal left 13 connects GND wiring layer by through-hole between metallic layers layer.Phase up and down
Adjacent the N4 active area 10 of two memory element, the left 12 and GND metal left sides 13 of GND layer inner via hole are shared.
RWL polysilicon left 15 and N5 active area 14 below form nmos pass transistor N5.N5 active area 14 passes through RBLB
Layer inner via hole 16 and RBLB metal 17 links up.The N5 active area 14 of two neighbouring memory element, RBLB layer inner via hole
16 and RBLB metals 17 are shared.RBLB metal connects RBLB wiring layer by through-hole between metallic layers layer.A RWL polysilicon left side 15
A RWL metal left side 19 is connected by RWL layer inner via hole left 18.A RWL polysilicon left side 15 for two memory element that left and right is adjacent, RWL
The left 18 and RWL metal left sides 19 of layer inner via hole are shared.
BIT polysilicon 2 and N2 active area 1 below form nmos pass transistor N2.N2 active area 1 is by logical in GND layer
The right 3 and GND metal right sides 4, hole are linked up.GND metal right 4 connects GND wiring layer by the via layer of metal interlevel.Neighbouring
The N4 active area 1 of two memory element, the right 3 and GND metal right sides 4 of GND layer inner via hole be shared.
RWL polysilicon right 6 and N3 active area 5 below form nmos pass transistor N3.N3 active area is by logical in RBL layer
Hole 7 and RBL metal 8 links up.The N3 active area 5 of two neighbouring memory element, RBL layer inner via hole 7 and RBL metal 8
It is shared.RBL metal 8 connects RBL wiring layer by through-hole between metallic layers layer.RWL polysilicon right 6 is by RWL layer inner via hole
The right connection RWL metal right side 9.The RWL polysilicon of two memory element that left and right is adjacent is right, the right 20 and RWL metals of RWL layer inner via hole
Right 9 is shared.
Although it is fast that the dual-port static random access memory that existing 10 pipe both-ends are read has speed, power consumption is little, peripheral circuit
Simple advantage；But chip area is big.
Summary of the invention
The technical problem big in order to solve existing two fracture SRAM chip areas, this utility model provides
A kind of two-port static random access memory cell, this utility model is by reducing the quantity of transistor, the scaled down version area of pictural surface.
Technical solution of the present utility model:
A kind of two-port static random access memory cell, including cross-linked phase inverter 1, phase inverter 2 302,
Nmos pass transistor N6, nmos pass transistor N7 and read port, write word line WWL connects nmos pass transistor N6's and nmos pass transistor N7
Grid end, the outfan of the drain terminal of nmos pass transistor N7, the input of phase inverter 1 and phase inverter 2 302 is connected to storage
The anti-BITB of node, the input of the outfan of phase inverter 1, the drain terminal of nmos pass transistor N6 and phase inverter 2 302 is all connected with
In memory node BIT, the source of nmos pass transistor N7 meets the anti-WBLB of write bit line, and the source of nmos pass transistor N6 meets write bit line WBL；
It is characterized in that described read port includes at least one nmos pass transistor.
Above-mentioned read port includes nmos pass transistor N8 and nmos pass transistor N9, the grid end of described nmos pass transistor N8 and storage
Node BIT connects, and the drain terminal of nmos pass transistor N8 is connected with sense bit line RBL, the grid end of described nmos pass transistor N9 and storage joint
The anti-BITB of point connects, and the drain terminal of nmos pass transistor N9 RBLB anti-with sense bit line is connected, and the anti-RWLB of readout word line connects nmos pass transistor
N8 and the source of nmos pass transistor N9.
Above-mentioned read port includes nmos pass transistor N10, described nmos pass transistor N10, the grid end of described nmos pass transistor N10
BITB anti-with memory node is connected, and the drain terminal of nmos pass transistor N10 RBLB anti-with sense bit line is connected, and the anti-RWLB of readout word line connects
The source of nmos pass transistor N10.
This utility model have the advantage that:
1, compare and 10 traditional pipe both-ends reading two-port static random access memory cells, 8 pipe two ends of the present utility model
The memory element of mouth static state decreases two transistors, at identical process conditions and identical DRC (DRC)
Under the conditions of, memory element domain height of the present utility model is constant, and width reduces about 10%, thus the domain face of memory element
Amass and reduce about 10%.
2, compare and 10 traditional pipe both-ends reading two-port static random access memory cells, the two of 7 pipes of the present utility model
The memory element of port static decreases three transistors, at identical process conditions and identical DRC
(DRC) under the conditions of, memory element domain height of the present utility model is constant, and width reduces about 26%, thus memory element
Chip area reduces about 26%.
Accompanying drawing explanation
Fig. 1 is the two-port static random access memory cell schematic diagram of 10 pipe both-ends readings of prior art.
Fig. 2 is the two-port static random access memory cell domain of 10 pipe both-ends readings of prior art.
Fig. 3 is the two-port static random access memory cell schematic diagram that 8 pipe both-ends of the present utility model are read.
Fig. 4 is the two-port static random access memory cell domain that 8 pipe both-ends of the present utility model are read.
Fig. 5 is 7 pipe two-port static random access memory cell schematic diagrams of the present utility model.
Fig. 6 is 7 pipe two-port SRAM domains of the present utility model.
Wherein reference is:
1-N2 active area, 2-BIT polysilicon, 3-GND layer inner via hole is right, and 4-GND metal is right, and 5-N3 active area, 6-RWL is many
Crystal silicon is right, 7-RBL layer inner via hole, 8-RBL metal, and 9-RWL metal is right, 10-N4 active area, 11-BITB polysilicon, 12-GND layer
Inner via hole is left, and 13-GND metal is left, 14-N5 active area, and 15-RWL polysilicon is left, 16-RBLB layer inner via hole, 17-RBLB metal,
18-RWL layer inner via hole is left, and 19-RWL metal is left, and 20-RWL layer inner via hole is right, and 21-RWLB layer inner via hole is right, in 22-RWLB layer
Through hole is left, and 23-RWLB metal is right, and 24-RWLB metal is left, and 25-RBL through hole, 26-RBL metal, 27 N8 active areas, 28 N9 have
Source region, 31 N10 active areas, 32-RBLB layer inner via hole, 33-RBLB metal, 34-BITB polysilicon, 35-RWLB metal, 36-
RWLB layer inner via hole.
Detailed description of the invention
Below in conjunction with specific embodiment, this utility model is described in further detail, described in be to this utility model
Explanation rather than restriction.
It is the two-port static random access memory cell schematic diagram of 8 pipe both-ends readings of the present utility model as indicated at 3, including handing over
The phase inverter 1 of fork coupling, phase inverter 2 302, nmos pass transistor N6-N9.
Memory node BIT connects input and the output of phase inverter 1 of phase inverter 2 302, is also connected with nmos pass transistor
The drain terminal of N6 and the grid end of nmos pass transistor N8.The anti-BITB of memory node connects input and the phase inverter 2 302 of phase inverter 1
Output, be also connected with the drain terminal of nmos pass transistor N7 and the grid end of nmos pass transistor N9.Write word line WWL connects nmos pass transistor
The grid end of N6, N7.The anti-WBLB of write bit line connects the source of nmos pass transistor N7.Write bit line WBL connects the source of nmos pass transistor N6
End.The anti-RWLB of readout word line connects the source of nmos pass transistor N8, N9.The anti-RBLB of sense bit line connects the drain terminal of nmos pass transistor N9.
Sense bit line RBL connects the drain terminal of nmos pass transistor N8.
Its operation principle is as follows:
When keeping pattern, sense bit line RBL and the anti-RBLB of sense bit line is precharged to supply voltage VDD.According to being stored in
The value with the anti-BITB of memory node of memory node BIT, N8 and N9 on and off.When memory node BIT is " 0 ", storage joint
When the anti-BITB of point is " 1 ", N8 turns off, and N9 turns on.The anti-RWLB of readout word line is pre-charged to VDD-Vtn3 by N9, and wherein Vtn3 is NMOS
The threshold voltage of transistor N9.When memory node BIT is " 1 ", and the anti-BITB of memory node is " 0 ", N9 turns off, and N8 turns on.Read
The anti-RWLB of wordline is pre-charged to VDD-Vtn2 by N8, and wherein Vtn2 is the threshold voltage of nmos pass transistor N8.
When read operation, sense bit line RBL and sense bit line anti-RBLB floating.For selected memory element, readout word line is anti-
RWLB is dragged down by readout word line decoder.According to being stored in memory node BIT and the anti-BITB of memory node value, by N8 or N9
RBLB anti-to sense bit line RBL or sense bit line discharges.When memory node BIT is " 0 ", and the anti-BITB of memory node is " 1 ", N8 closes
Disconnected, N9 turns on.Discharged by N9 RBLB anti-to sense bit line.Owing to N8 turns off, sense bit line RBL is maintained at supply voltage VDD.When depositing
Storage node BIT is " 1 ", and when the anti-BITB of memory node is " 0 ", N9 turns off, and N8 turns on.By N8, sense bit line RBL is discharged.Due to
N9 turns off, and the anti-RBLB of sense bit line is maintained at supply voltage VDD.When voltage difference delta RBL on sense bit line RBL and RBLB reaches sensitive
During the offset voltage of amplifier, the small signal difference of sense bit line RBL and RBLB is zoomed into full swing by sense amplifier.
As shown in Figure 4, Fig. 4 is the two-port static random access memory cell domain that 8 pipe both-ends of the present utility model are read.From
Include down metal level, via layer, polysilicon layer, active region layer, N implanted layer, and P implanted layer.Each layer uses different filling out
Fill figure and carry out labelling.
BITB polysilicon 11 and N9 active area 28 below form nmos pass transistor N9.N9 active area 28 is by RBLB layer
Inner via hole 16 and RBLB metal 17 links up.RBLB metal 17 connects RBLB wiring layer by inter-level vias.Neighbouring two
The N9 active area 28 of individual memory element, RBLB layer inner via hole 16 and RBLB metal 17 are shared.N9 active area 28 also by
RWLB layer inner via hole left 22 connects a RWLB metal left side 24.RWLB metal left 24 connects RWLB by inter-level vias and metal and connects up
Layer.
BIT polysilicon 2 and N8 active area 27 below form nmos pass transistor N8.N8 active area 27 is by RBL layer
Through hole 25 and RBL metal 26 links up.RBL metal 26 connects RBL wiring layer by inter-level vias.Two neighbouring storages
The N8 active area of unit, RBLB layer inner via hole and RBLB metal are shared.N8 active area is also by the RWLB layer inner via hole right side 21
Connect the RWLB metal right side 23.RWLB metal right 23 connects RWLB wiring layer by inter-level vias and metal.
As it is shown in figure 5, the schematic diagram of 7 pipe two-port static random access memory cells includes cross-linked phase inverter one
301, phase inverter 2 302, nmos pass transistor N6, nmos pass transistor N7 and read port, write word line WWL connects nmos pass transistor N6
With the grid end of nmos pass transistor N7, the drain terminal of nmos pass transistor N7, the input of phase inverter 1 and phase inverter 2 302
Outfan is connected to the anti-BITB of memory node, the outfan of phase inverter 1, the drain terminal of nmos pass transistor N6 and phase inverter two
The input of 302 is all connected to memory node BIT, and the source of nmos pass transistor N7 meets the anti-WBLB of write bit line, nmos pass transistor N6
Source meet write bit line WBL；Read port includes grid end and the anti-BITB of memory node of nmos pass transistor N10, nmos pass transistor N10
Connecting, the drain terminal of nmos pass transistor N10 RBLB anti-with sense bit line is connected, and the anti-RWLB of readout word line connects the source of nmos pass transistor N10
End.
As shown in Figure 6,7 pipe two-port static random access memory cell domains, BIT polysilicon 34 and N10 below have
Source region 31 forms nmos pass transistor N10.N10 active area is linked up by RBLB layer inner via hole 32 and RBLB metal 33.RBLB gold
Belong to 33 and connect RBLB wiring layer by inter-level vias.Lead in the N10 active area 31 of two neighbouring memory element, RBLB layer
Hole 32 and RBLB metal 33 is shared.N10 active area 31 connects RWLB metal 35 also by RWLB layer inner via hole 36.RWLB gold
Belong to 35 and connect RWLB wiring layer by inter-level vias and metal.
Claims (3)
1. a two-port static random access memory cell, including cross-linked phase inverter one (301), phase inverter two (302),
Nmos pass transistor N6, nmos pass transistor N7 and read port, write word line WWL connects nmos pass transistor N6's and nmos pass transistor N7
Grid end, the outfan of the drain terminal of nmos pass transistor N7, the input of phase inverter one (301) and phase inverter two (302) is connected to
The anti-BITB of memory node, the outfan of phase inverter one (301), the drain terminal of nmos pass transistor N6 and the input of phase inverter two (302)
End is all connected to memory node BIT, and the source of nmos pass transistor N7 meets the anti-WBLB of write bit line, and the source of nmos pass transistor N6 connects to be write
Bit line WBL；It is characterized in that: described read port includes at least one nmos pass transistor.
Two-port static random access memory cell the most according to claim 1, it is characterised in that: described read port includes
Nmos pass transistor N8 and nmos pass transistor N9, the grid end of described nmos pass transistor N8 is connected with memory node BIT, nmos pass transistor
The drain terminal of N8 is connected with sense bit line RBL, and the grid end BITB anti-with memory node of described nmos pass transistor N9 is connected, nmos pass transistor
The drain terminal of N9 RBLB anti-with sense bit line is connected, and the anti-RWLB of readout word line connects nmos pass transistor N8 and the source of nmos pass transistor N9.
Two-port static random access memory cell the most according to claim 1, it is characterised in that: described read port includes
The grid end BITB anti-with memory node of nmos pass transistor N10, described nmos pass transistor N10, described nmos pass transistor N10 is connected,
The drain terminal of nmos pass transistor N10 RBLB anti-with sense bit line is connected, and the anti-RWLB of readout word line connects the source of nmos pass transistor N10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620787252.8U CN205881467U (en) | 2016-07-25 | 2016-07-25 | Both ends mouth static RAM unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620787252.8U CN205881467U (en) | 2016-07-25 | 2016-07-25 | Both ends mouth static RAM unit |
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| Publication Number | Publication Date |
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| CN205881467U true CN205881467U (en) | 2017-01-11 |
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ID=57696954
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620787252.8U Active CN205881467U (en) | 2016-07-25 | 2016-07-25 | Both ends mouth static RAM unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106067317A (en) * | 2016-07-25 | 2016-11-02 | 西安紫光国芯半导体有限公司 | A kind of two-port static random access memory cell |
-
2016
- 2016-07-25 CN CN201620787252.8U patent/CN205881467U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106067317A (en) * | 2016-07-25 | 2016-11-02 | 西安紫光国芯半导体有限公司 | A kind of two-port static random access memory cell |
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