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WM72016 Schematic ( PDF Datasheet ) - Ramtron

Teilenummer WM72016
Beschreibung 16Kbit Secure F-RAM Memory
Hersteller Ramtron
Logo Ramtron Logo 




Gesamt 32 Seiten
WM72016 Datasheet, Funktion
www.DataSheet.co.kr
Preliminary
WM72016
16Kbit Secure F-RAM Memory with Gen-2 RFID
Access & Serial Port Direct Memory Access
DESCRIPTION
FEATURES
The WM72016 is a RFID transponder IC with
nonvolatile memory employing an advanced
ferroelectric process. A ferroelectric random access
memory, or F-RAM, is nonvolatile and performs
reads and writes like a RAM. It provides reliable data
retention for 20 years while eliminating the
complexities, overhead, and system level reliability
problems caused by EEPROM and other nonvolatile
memories.
Unlike EEPROM‟s, the WM72016 write operations
are zero power there is no power or speed premium
paid for executing writes into the WM72016 as
compared to read power and speed. Operation of the
memory is fully symmetric: it has an equivalent read
and write range.
The WM72016‟s RFID interface is compatible with
the EPC Class-1 Generation-2 UHF RFID Protocol
for Communications at 860 MHz 960 MHz,
Version 1.2.0 Specification for RFID Air Interface.
The WM72016 is a two chip configuration offered in
various forms: standard IC package or wafers. All
specifications discussed herein are applicable to the
combined chipset operation.
WM72016
RFID Tag
with F-RAM
RFID
Reader
(Class-1
Gen-2)
Figure 1. System Block Diagram
16 Kbit Ferroelectric Nonvolatile RAM
Organized as 1024 x 16 bits
Very High Read/Write Endurance (> 1014)
20-Year Data Retention
Gamma Stability Demonstrated to > 30 kGy
Symmetric Read/Write Operation
Advanced High-Reliability Ferroelectric Process
Interface and Security Features
EPC Class 1 Gen2 (ISO18000-6C) RFID
Compatible Interface (revision 1.2.0)
192-Bit Memory: 96-Bit Electronic Product
Code™ (EPC), 32-Bit Access Password, 32-Bit
KILL Password, 64-Bit TID Memory (Factory
Programmed and Locked)
Inventory, Read, Write and Erase features
Kill Command
Block Permalock Command
Access Command
UHF carrier frequencies from 860 MHz to 960
MHz ISM band, ASK demodulation
Tag-to-reader link frequencies up to 640Kbps
Reader-to-tag asymptotical transmission rates up
to 128Kbps
Supports FM0 and MMS data encoding formats
Serial Port Interface
Custom Features
Stored Address Pointer to Improve Data Write
Speed
Stored Address Pointer Lock
Block Write Command
Variable USER memory block size support
Interrupt Generation
Ultra Low Power Operation
Memory Read/Write Sensitivity: < -6 dBm (typ.)
Industry Standard Configurations
Industrial Temperature -40C to +85C
Bumped Wafers
8-pin UDFN
This is a product that has fixed target specifications but are
subject to change pending characterization results.
Rev. 1.4
May 2011
Ramtron International Corporation
1850 Ramtron Drive, Colorado Springs, CO 80921
(800) 545-FRAM, (719) 481-7000
http://www.ramtron.com
Page 1 of 32
Datasheet pdf - http://www.DataSheet4U.net/






WM72016 Datasheet, Funktion
www.DataSheet.co.kr
WM72016 Secure F-RAM with Gen-2 RFID and Serial Port
MaxArias Write Cycle
INTERROGATOR
SELECT
(385u)
QURY
(240u)
ACK
(175u)
TAG
RN
(53u)
EPC
(228u)
REQRN
(345u)
REQRN
(345u)
HANDLE
(78u)
RN16
(78u)
WRITE
(495u)
WR_OK
(80u)
EEPROM-based Write Cycle
ChargEeEpPuRmOpM&wEriEtesdoealkayti!me
4ms
Figure 3. Gen2 Memory Write Cycle Comparison: F-RAM vs. EEPROM Memories
RESERVED: KILL Password:
The kill password provides a mechanism to permanently disable the WM72016 RFID from responding to any
and all Gen2 interrogator commands. The mandatory KILL command can be issued by a RFID interrogator in
either the OPEN or SECURED states. The WM72016 is permanently killed through a four-instruction
sequence of REQRN and KILL commands as detailed in the Gen2 standard. The KILL password is a 32-bit
value stored as 2 16-bit data words in reserved memory. The most significant KILL password is stored in
reserved memory bank address 0x00 with the least significant word stored in reserved memory bank address
0x01. The kill function can be permanently disabled by setting both KILL password words to 0x0000, and
permanently locking the KILL password in the reserved memory bank. Once the kill password has been set, it
should be permanently locked using the LOCK command. The WM72016 is shipped from the factory with the
kill password memory unlocked. The kill state of the device only affects the Gen2 RFID processor the DSPI
serial port will continue to function normally.
RESERVED: ACCESS Password:
The access password provides a security mechanism to prevent unauthorized RFID interrogators from writing
to WM72016 memory. Non-zero access passwords require the WM72016 be placed in the SECURED state
prior to writing to it. This is accomplished through a four-instruction sequence of REQRN and ACCESS
commands as described in the Gen2 standard. An access password with a value of zero requires no
authentication prior to writing to WM72016 memory. The ACCESS password is a 32-bit value stored as two
16-bit data words in reserved memory. The most significant ACCESS password is stored in reserved memory
bank address 0x02 with the least significant word stored in reserved memory bank address 0x03. Once the
access password has been set, it should be permanently locked using the LOCK command. The WM72016 is
shipped from the factory with the access password memory unlocked. The value of the access password has no
effect on the functionality of the DSPI serial port.
EPC Memory Bank:
The EPC memory bank accommodates 8 words: 1 protocol control (PC) word, a 6-word (96-bit) memory space
for an EPC identifier, and a 1-word CRC. The CRC word is calculated as part of the WM72016 power-on
initialization routine and written into the EPC memory bank address 0x00. The PC and 6-word EPC identifier
are completely programmable. The Protocol Control field is shown in Figure 4.
Rev. 1.4
May 2011
Page 6 of 32
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6 Page









WM72016 pdf, datenblatt
www.DataSheet.co.kr
WM72016 Secure F-RAM with Gen-2 RFID and Serial Port
Wrap Enable: Asserting the WRPEN control bit to a logic one enables the USER memory wrapping feature.
The wrap enable feature allows the stored address pointer to wrap back to the factory-set initial stored address
value of 0x006. In this manner, the WM72016 memory acts as a circular buffer. Clearing the WRPEN control
bit disables wrapping resulting in a write-once memory. In this case, when the Working Stored Address
reaches the end of user memory, no additional unaddressed write cycles will be possible. The WRPEN and
AUTOLOCK control bits are mutually exclusive only one of the two control bits may be asserted at any
given time.
Auto Lock Enable: Asserting the AUTOLOCK control bit to a logic one enables memory locking of the USER
memory span between the start of USER memory and the Working Stored Address. The AUTOLOCK and
WRPEN control bits are mutually exclusive only one of the two control bits may be asserted at any given
time. The automatic locking feature can only be used when AUTOINCR is asserted to a logic one.
Auto Increment: Asserting AUTOINCR control bit to a logic one enables the Working Stored Address
increment function. Upon receiving an unaddressed write cycle, the WM72016 increments the pointer stored
in the Working Stored Address register to point to the next free memory location then writes the cover-coded
data word to the respective memory location. This functionality removes any requirement for a RFID
interrogator to determine where free USER memory is located and manipulating the memory pointer itself.
WORKING STORED ADDRESS
To better utilize the F-RAM‟s fast write capability, memory has been architected using an optional Working
Stored Address register. The stored address function enables automation of the storage of large blocks of user
data, such as pedigree or tracking information. This feature enables a RFID interrogator the ability to use a
standard Gen2 WRITE command using a designated address of 0x3FFF (0xFF7F EBV-formatted) as a redirect
pointer to use the contents of the Working Stored Address register this is referred to as an unaddressed write
(UNADDR_WRITE). The Working Stored Address is a USER memory address pointer used to address the
first available USER memory data word as shown in Figure 12. The Working Stored Address is a read/write
register located at address 0x003 in USER memory. It may be used to address USER memory only it is an
address pointer to a memory location within the USER memory bank and cannot be used to address other
memory banks or memory regions in the WM72016. It may be manually updated by simply writing to USER
memory address 0x003 or will automatically increment when the AUTOINCR control bit in the Control/Status
register is asserted to a logic one and an unaddressed write command is received.
LCK PLCK
RFU
INIT
EN
ADDR[9:0]
Figure 11. Working Stored Address Register
Table 6: Working Stored Address Bit Definitions
Bit Mnemonic
15 LOCK
14 PERMALOCK
13:11 RFU
10 INITEN
9:0 ADDR
Function
Memory locking of this register.
LOCK
0
0
1
PERMALOCK
0
1
0
11
Reserved for future use
DESCRIPTION
Register unlocked
Register permanently unlocked
Register writeable only from the
SECURED state
Register permanently locked
When asserted to a logic ‘1’, sets the contents of the Initial Stored
Address register with the value defined in the 10-bit address field in bits
9 through 0 written to this register using a Gen2 write instruction.
Working stored address pointer
Initial
Value
0
0
0
0
006
Rev. 1.4
May 2011
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