ST25DV04K datasheet(106/220 Pages) STMICROELECTRONICS

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RF operations

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7.4.8

Response and error code

If the Error_flag is set by the ST25DVxxx in the response, the Error code field is present and

provides information about the error that occurred.

Error codes not specified in Table 62: Response error code definition are reserved for future

use.

7.5

Timing definition

t1: ST25DVxxx response delay

Upon detection of the rising edge of the EOF received from the VCD, the ST25DVxxx waits

for a t1nom time before transmitting its response to a VCD request or switching to the next

slot during an inventory process. Values of t1 are given in Table 63: Timing values.

t2: VCD new request delay

t2 is the time after which the VCD may send an EOF to switch to the next slot when one or

more ST25DVxxx responses have been received during an Inventory command. It starts

from the reception of the EOF from the ST25DVxxxs.

The EOF sent by the VCD may be either 10% or 100% modulated regardless of the

modulation index used for transmitting the VCD request to the ST25DVxxx.

t2 is also the time after which the VCD may send a new request to the ST25DVxxx, as

described in Figure 32: ST25DVxxx protocol timing.

Values of t2 are given in Table 63: Timing values.

t3: VCD new request delay when no response is received from the ST25DVxxx

t3 is the time after which the VCD may send an EOF to switch to the next slot when no

ST25DVxxx

response has been received.

The EOF sent by the VCD may be either 10% or 100% modulated regardless of the

modulation index used for transmitting the VCD request to the ST25DVxxx.

Table 62. Response error code definition

Error code

Meaning

01h

Command is not supported.

02h

Command is not recognized (format error).

03h

The option is not supported.

0Fh

Error with no information given.

10h

The specified block is not available.

11h

The specified block is already locked and thus cannot be locked again.

12h

The specified block is locked and its contents cannot be changed.

13h

The specified block was not successfully programmed.

14h

The specified block was not successfully locked.

15h

The specified block is protected in read.

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