ST25DV04K datasheet(78/197 Pages) STMICROELECTRONICS

78 / 197 page

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 99 are reserved for future use.

Table 99. 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.

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 100. 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 100. 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.

From the time the VCD has generated the rising edge of an EOF:

•

If this EOF is 100% modulated, the VCD waits for a time at least equal to t3min for 100% modulation before

sending a new EOF.

•

If this EOF is 10% modulated, the VCD waits for a time at least equal to t3min for 10% modulation before

sending a new EOF.

ST25DV04K ST25DV16K ST25DV64K

Timing definition

DS10925 - Rev 11

page 78/197

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