SR176 datasheet(16/35 Pages) STMICROELECTRONICS

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Device operations (instructions)

SR176

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5.2

SELECT(Chip_ID)

Command Code = 0Eh,(X.ID)h

Prior to any memory access, the SR176 must have been set in the SELECTED state by a

SELECT() command. All other commands sent to the SR176 before the SELECT(), except

INITIATE(), are ignored. In response to receiving the SELECT() command, the SR176

sends back its Chip_ID, using an 8-bit format (Figure 21).

Any SR176 that is already in the SELECTED state, and which receives a SELECT()

command that does not match its Chip_ID, is automatically put in the DESELECTED state.

The SR176 stays in the SELECTED state up to the reception of a COMPLETION or a

SELECT with a non-matching Chip_ID.

After a PROTECT_BLOCK command, it is necessary to send a new SELECT command in

order to load enable the write access again in the internal logic. If a SELECT is not send, the

SR176 keeps the previous write access rights.

Request parameters (Figure 18):

●

Chip_ID (formatted as shown in Figure 20)

Response parameters (Figure 19):

●

Chip_ID (formatted as shown in Figure 20)

Figure 18.

SELECT request format

Figure 19.

SELECT response format

Figure 20.

8-bit Chip_ID format

SOF

SELECT

CRCL

CRCH

EOF

AI07702B

0Eh

4 reserved bits

+ 4-bit ID

8 bits

Chip_ID

SOF

Chip_ID

CRCL

CRCH

EOF

AI07703B

4 reserved bit

+ 4-bit ID

8 bits

AI07704B

Test bits (block 15)

Block 15

4-bit Chip_ID of the SR176

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