WM71000-NBSD-SA Ramtron, WM71000-NBSD-SA Datasheet - Page 7

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

Specifications of WM71000-NBSD-SA

• Mounting Style: SMD/SMT
• Package / Case: SOIC-8

Rev. 1.3
Apr. 2011
The five most significant bits of the PC indicates the size of the EPC identifier in words – for a 96-bit (6-word)
EPC identifier, the PC should be programmed to 0b0011_0xxx_xxxx_xxxx. The LEN parameter of the PC
word may not be greater than 0b00110 – a LEN parameter of 0b00000 has an EPC identifier length of zero
words resulting in only the PC and CRC words when WM710xx is acknowledged. The UMI bit (User
Memory Identifier) is asserted to a logic one by WM710xx and mapped to bit 10 of the PC word. In the event
the host writes a logic zero to the UMI bit, the memory location will be written with a logic zero, however the
backscattered EPC identifier will assert the UMI bit to a logic one which is also used in the calculation of the
CRC. WM710xx does not support extended protocol control and should be written with a logic zero. PC word
bits 8 down to 0 of the PC word are factory-initialized to zero. The WM710xx is shipped from the factory with
the EPC memory bank unlocked.
TID Memory Bank:
The TID memory bank consists of 4 words (64 bits), and is defined as shown in Table 2. The TID memory
bank is permanently locked at the factory and obeys the ISO/IEC 15963 numbering convention.
Table 2: TID memory Bank Fields
Bit Field
00
08
14
20
h
h
h
h
– 07
– 13
– 1F
– 3F
bit
h
h
h
h
16
32
48
0
DEFAULT
15
MDID[3:0]
Value
(hex)
016
216
E2
00110
Figure 4. EPC Protocol Control Word
Class Identifier
LEN
Figure 5. TID Memory Bank Fields
19
20
Description
ISO/IEC 15963 class-identifier
Mask-Designer Identifier (MDID) – Ramtron International
Tag model number
32-bit unique identifier
11
PROTOCOL CONTROL WORD
UMI
10
1
XPC NT
9
0
ID[31:16]
ID[15:0]
7
8
0
8
7
TMN[11:0]
WM710xx – Secure F-RAM with Gen-2 RFID
Numbering System Identifier
NSI Type
Extended Protocol Control
User Memory identifier
EPC Identifier Word Length
MDID[11:4]
00000000
NSI
15
31
47
63
0
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