XRA00 datasheet(32/40 Pages) STMICROELECTRONICS

32 / 40 page

XRA00

32/40

Lock Function

The Lock function is implemented by programming

a specific value into the lock bits of the XRA00, us-

ing the ProgramID command. In order to lock the

XRA00, the 8 upper bits of the row 7 must be pro-

grammed with the value A5h, as shown in Table

14. and Table 15.

If a value different from A5h is programmed in the

8 upper bits of the row 7, the tag in NOT LOCKED,

and the XRA00 will return this value in response to

any ScrollID, ScrollAllID or Verify command.

Table 14. Row 7 of an Unlocked or Erased Memory

Table 15. Row 7 of a Locked Memory (Showing Lock Code A5h)

EraseID and ProgramID Timing

The time required to erase or program a XRA00 is

terase and tpgm, respectively. See Table 4., XRA00

Backscattered Answer Modulation Parameters for

values.

The Reader to XRA00 Request Frame is much like

the Basic Command frame. The differences be-

tween the two are listed below:

■

The Programmer must send 0's after the

[EOF] for the duration of the program or erase

time, tpgm or terase.

■

The ProgramID and EraseID operations are

terminated by a "1" at the end of terase or tpgm.

■

The Programmer must transmit seven 0's after

the terminating "1" to allow the XRA00 to

perform an orderly shutdown of the erase/

program sequence.

■

Transmission of subsequent programming

commands must be preceded by an XRA00

carrier off interval of at least 8 x t0.

Figure 34. EraseID and ProgramID Signaling

Row 7

Lock Bit

bit8bit 1

Kill Code

bit8bit1

bit

127

126

125

124

123

122

121

120

119

118

117

116

115

114

113

112

Value

000

Row 7

Lock Bit

bit8bit 1

Kill Code

bit8bit1

bit

127

126

125

124

123

122

121

120

119

118

117

116

115

114

113

112

Value

000

ai10772

Prior sequence

transaction gap

or carrier off

Spin up

20 0's

EOF

64µs

000000000000000000000

Variable Data

Command

Pointer

Length

always 16

Value

Power Off Interval

Between Rows

= 8t0 minimun

7 0's

0's

terase or tpgm

ProgramID, EraseID Commands

variable

number

of bits

16 data bits

10000000

variable number of bits

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