WM71000-NBSD-DA Ramtron, WM71000-NBSD-DA Datasheet - Page 10

• Manufacturer Part Number: WM71000-NBSD-DA
• Description: RFID Transponder AFE Chip (No Memory) Gen-2 RFID Access
• Manufacturer: Ramtron

Specifications of WM71000-NBSD-DA

• Mounting Style: SMD/SMT
• Package / Case: DFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CONTROL/STATUS REGISTER
Rev. 1.3
Apr. 2011
Accessing the unique features of WM710xx is accomplished through the Control/Status register in F-RAM
non-volatile memory.
The Control/Status word register is organized as shown in Table 3: below. Care should be exercised when
writing the Control/Status register word if it is to remain unlocked.
Table 3: Control/Status Word Register
Bit
LCK
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Mnemonic
LOCK
PERMALOCK
RFU
RFU
RFU
RFU
RFU
RFU
BLKWREN
BLKSIZ[2]
BLKSIZ[1]
BLKSIZ[0]
WRPSTAT
WRPEN
AUTOLOCK
AUTOINCR
PLCK
The register is located at physical address 0x016 or USER memory address 0x002.
RFU
Figure 10. Control/Status Register
Function
Memory locking of this register.
Enables use of the custom command BLOCKWRITE.
USER memory block size.
Indicates if the Working Stored Address has wrapped.
Enables wrapping of the Working Stored Address when it reaches the
top of logical memory.
Enable Automatic Locking of all user memory between the start of USER
memory and the Working Stored Address register.
Enable the Working Stored Address word to Auto-Increment when
performing an unaddressed write cycle.
Reserved for future use
Reserved for future use
Reserved for future use
Reserved for future use
Reserved for future use
Reserved for future use
BLKSIZ[2:0]
000
001
010
011
Logic State
0
1
Logic State
0
1
Logic State
0
1
Logic State
0
1
LOCK
0
0
1
1
# words
1
2
4
8
Description
Wrapping has not occurred
Wrapping has occurred at least once
Description
DISABLE memory wrapping
ENABLE memory wrapping.
Description
Auto-lock DISABLED
Auto-lock ENABLED
Description
DISABLE auto-increment of stored address register
ENABLE auto-increment of stored address register
PERMALOCK
BW
EN
0
1
0
1
WM710xx – Secure F-RAM with Gen-2 RFID
BLKSIZ
DESCRIPTION
Register unlocked
Register permanently unlocked
Register writeable only from the
SECURED state
Register permanently locked
BLKSIZ[2:0]
100
101
110
111
WRP
# words
16
32
64
128
WRP
EN
ALCK
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Initial
Value
AINC
0
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0