Commercial SRAM Macro

SRAM_1024x32

Overview

This is a 1024 words by 32 bits commercial grade low power embedded Single Port Synchronous (flow through) SRAM in SKY130 technology. An active high read-write enable signal controls the read/write operation of the memory. When bit-enable is high and readwrite enable is low, data on the data input pin is written into the memory location addressed by the address present on the address pins. Reading the device is accomplished while read-write enable is high. Under these conditions, the contents of the location addressed by the information on address lines is present on the data output pin. In write cycle, data to be written is driven onto data output pin. If there is no read or write, while memory is enabled, data output pin will hold previous data.

Memory dimesions in SKY130 technology: 387.870 um x 303.315 um = 0.118 mm²

Memory Features:

Synchronous Read-Write
Active High Bit Enables
Single Read-Write Enable (Low = write, High = read)
Write on a bit basis
Separate pins for data input and data output
Separate Power Supplies for core and periphery
Body bias option
Scan Chain Testmode
Wafer Level Burn-In Testmode
Option to switch off all wordlines while chip is enabled
Option for Power Switch
Clock Gating

Block Diagram

Pin Description

NAME	TYPE	DIRECTION	DESCRIPTION
AD [9:0]	CMOS	IN	This input value selects the location to be read during a read cycle, and the location to be written during a write cycle. It is sampled on rising edge of clock.
R_WB	CMOS	IN	This is the read/write control and sampled on rising edge of clock. When R_WB is high, the memory is in a read cycle mode. When R_WB is low, the memory is in write cycle mode.
CLKin	CMOS	IN	Clock synchronizes the operations of the memory. All inputs are sampled on rising edge of clock.
BEN [31:0]	CMOS	IN	Each bit of the BEN bus selects one bit of the DI bus. When one or more BEN inputs are high (active), and R_WB is low (write enabled) then the selected bits will be written into the memory.
DI [31:0]	CMOS	IN	This data is written into the memory location selected by addr input during the write cycle. It is ignored during a read cycle.
EN	CMOS	IN	EN (Chip Enable) is high (and TM low), read and write operation is performed.
TM	CMOS	IN	When TM (Testmode)is high, memory is in testmode and normal memory operation is disabled. Inputs are tied to outputs through scan chain logic.
SM	CMOS	IN	When SM (Scan chain control) is high, output of a input register is passed to next register. When low, input register receives input from input pin.
WLBI	CMOS	IN	Wafer Level Burn-In Test mode control: When high, all wordlines are ON.
WLOFF	CMOS	IN	Normal operation when low. All wordlines are clamped to vnb when high.
ScanInCC	CMOS	IN	Input to Address and Control scan chain.
ScanInDL	CMOS	IN	Input to Data scan chain (left side of the macro).
ScanInDR	CMOS	IN	Input to Data scan chain (right side of the macro).
DO [31:0]	CMOS	OUT	Data from the memory location selected by address is driven onto DO during a read cycle. In a write cycle, data to be written is driven onto DO. If there is no read or write, while memory is enabled, DO will hold previous data.
ScanOutCC	CMOS	OUT	Output of Scan Chain of address and control pins. Note - DO is output of scan chain of data input pins.

Without the Power Switch feature enabled (default recommended mode)

NAME	TYPE	DIRECTION	DESCRIPTION
vpwrm	Supply	IN	Connect vpwrm to core power supply vpwra
vpwra	Supply	IN	Nominal 1.8 power supply to memory array
vpwrp	Supply	IN	Nominal 1.8 power supply to periphery
vpwrac	Supply	IN	Connect vpwrac to core power supply vpwra
vpwrpc	Supply	IN	Connect vpwrpc to core power supply vpwra
vgnd	Supply	IN	Nominal 0 V power supply (ground).
vpb	Bias Voltage	IN	Nwell connection, tie to the maximum power supply (can be vpwra or vpwrp)
vnb	Bias Voltage	IN	Pwell connection, nominally equal to vgnd

With the Power Switch feature enabled

NAME	TYPE	DIRECTION	DESCRIPTION
vpwrm	Supply	IN	Nominal 1.8 main power supply
vpwra	Supply	IN	power supply to memory array (internal node)
vpwrp	Supply	IN	power supply to periphery (internal node)
vpwrac	Supply	IN	Control signal to turn on the power supply to periphery (active LOW, CMOS)
vpwrpc	Supply	IN	Control signal to turn on the power supply to core (active LOW, CMOS)
vgnd	Supply	IN	Nominal 0 V power supply
vpb	Bias Voltage	IN	Nwell connection, tie to the maximum power supply (can be vpwrm)
vnb	Bias Voltage	IN	Pwell connection, nominally equal to vgnd

Specifications

DC Specifications

Conditions

Process Condition : Typical
Junction Temperature : 25.000 deg C
Operating Voltage : 1.800 V
Operating Frequency : 100 MHz

Power Dissipation When R_WB=HIGH

READ Active = 77.566 pJ
READ Active = 8.618 mA
READ Peak = 80.613 mA

Power Dissipation When R_WB=LOW

WRITE Active = 69.948 pJ
WRITE Active = 7.772 mA
WRITE Peak = 79.072 mA

Power Dissipation When EN=LOW, All Other Inputs Switching

Standby = 0.174 pJ
Standby = 0.019 mA
Standby Peak = 0.470 mA

Power Dissipation When TM=HIGH, Clock Switching

Test Mode = 9.603 pJ
Test Mode = 1.067 mA
Test Peak = 33.687 mA

Leakage: Power switches ON, Disabled (EN=LOW)

Power = 41611.200 pW
Current = 23.120 nA

Leakage - One or More Power switches OFF (VPWRPC=HIGH or VPWRAC=HIGH)

Power = 1420.430 pW
Current = 0.790 nA

AC Specifications