XRA00 datasheet(31/40 Pages) STMICROELECTRONICS

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XRA00

PROGRAMMING COMMANDS - OVERVIEW

Programming commands use the same command

structure and field definitions as the Basic com-

mands, but are issued only by an XRA00 program-

mer.

An XRA00 programmer may be similar to a Read-

er, except that it can execute Programming com-

mands

addition

Basic

commands.

Programming commands are used to program the

contents of the XRA00 non-volatille memory, and

to verify these contents before locking them. All

Programming commands are disabled once the

manufacturer has locked the XRA00 data con-

tents. The programming range is approximately

25% of the maximum read range. The program-

ming distance depends on the tag antenna design,

tag materials, programmer antenna design, RF

power level and system configuration.

VerifyID

The VerifyID command is used to examine the

contents of a memory block as part of a program-

ming cycle in order to allow the manufacturer pro-

grammer to verify that the entire memory block

has been programmed correctly into the XRA00.

XRA00 devices that have been LOCKED will not

answer to the VerifyID command. The VerifyID

command addresses all bits in the XRA00 memory

that are transmited to the programmer in the same

Answer Frame format as the ScrollAllID Reply.

EraseID

The EraseID command resets all bits in the

XRA00 to the value "0". This command is a bulk

erase of the entire memory array. The EraseID op-

eration is normally executed prior to the Progra-

mID command. The EraseID command is not

executed on XRA00 devices that have been

LOCKED. The data sent by the Programmer in the

[PTR] and [VAL] fields are not used by the XRA00

and should be set to "0". The [LEN] field should be

set to the value “1”, and the [VAL] field should con-

tain a single "0". Upon receipt of a valid EraseID

command, the XRA00 executes the appropriate

internal timing sequences required to erase the

memory.

See Figure 34. for the EraseID command signaling

sheme.

ProgramID

The XRA00 is programmed 16 bits at a time. Pro-

gramming is only allowed if the XRA00 is not

locked. The data is sent to the XRA00 using the

ProgramID command. The [PTR] field contains the

memory row address to be programmed and the

[VAL] field contains the 16 bits of data to be pro-

grammed. The [PTR] field value must be set as

specified in Table 13.

See Figure 34. for the ProgramID command sig-

naling sheme.

The [LEN] field must be set to the value 16

(00010000b), indicating that 16 bits are pro-

grammed.

Upon receipt of a valid ProgramID command, the

XRA00 executes the appropriate internal timing

sequences required to program the memory.

Table 13. Programming Row Selection

[PTR] Value

MSB

LSB

Row to be Programmed

00D

00000000b

row 0, bits 0-15

16D

00010000b

row 1, bits 16-31

32D

00100000b

row 2, bits 32-47

48D

00110000b

row 3, bits 48-63

64D

01000000b

row 4, bits 64-79

80D

01010000b

row 5, bits 80-95

96D

01100000b

row 6, bits 96-111

112D

01110000b

row 7, bits 112-127

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