Datasheet

18 of 43

002-19073 Rev. *N

2022-01-20

2Mb EXCELON™ Auto Ferroelectric RAM (F-RAM)

Serial (SPI), 256K × 8, automotive grade 1

Functional description

6.1.6.2

Special sector read (SSRD, 4Bh)

After the falling edge of CS, the bus master can issue an SSRD opcode. Following the SSRD command is a

three-byte address containing the 8-bit address (A7–A0) of the first byte of the special sector read operation. The

upper 16 bits of the address are ignored. After the opcode and address are issued, the device drives out the read

data on the next eight clocks. The SI input is ignored during read data bytes. Subsequent bytes are data bytes,

which are read out sequentially. Addresses are incremented internally as long as the bus master continues to

issue clocks and CS is LOW. Once the internal address counter auto increments to XXXFFh, CS should toggle HIGH

to terminate the ongoing SSRD operation. Data is read on MSb first. The rising edge of CS terminates a special

sector read operation and tristates the SO pin. The CY15X102QN special sector read operation is shown in

Figure 14.

Note The special sector F-RAM memory guarantees to retain data integrity up to three cycles of standard reflow

soldering.

Figure 14

Special sector read operation

6.1.7

Identification and serial number commands

6.1.7.1

Read device ID (RDID, 9Fh)

The CY15X102QN device can be interrogated for its manufacturer, product identification, and die revision. The

RDID opcode 9Fh allows the user to read the 9-byte manufacturer ID and product ID, both of which are read-only

bytes. The JEDEC-assigned manufacturer ID places the CYPRESS™ (Ramtron) identifier in bank 7; therefore, there

are six bytes of the continuation code 7Fh followed by the single byte C2h. There are two bytes of product ID,

which includes a family code, a density code, a sub code, and the product revision code. Table 6 shows 9-Byte

Device ID field description. Refer to “Ordering information” on page 35 for 9-Byte device ID of an individual part.

The CY15X102QN read device ID operation is shown in Figure 15.

Note The least significant data byte (Byte 0) shifts out first and the most significant data byte (Byte 8) shifts out

last.

Table 7

9-byte device ID

Device ID field description

Manufacturer

ID

[71:16]

Family

[15:13]

Density

[12:9]

Inrush

[8]

Sub type

[7:5]

Revision

[4:3]

Voltage

[2]

Frequency

[1:0]

56-bit

3-bit

4-bit

1-bit

3-bit

2-bit

1-bit

2-bit

0

123

4

5

67

CS

SI

SCK

0

1

23

45

6

7

SO

01

00

1

0

1

1

D7 D6

D5

D4 D3 D2 D1

D0

Hi-Z

Hi-Z

MSB

LSB

Opcode (4Bh)

Read Data

A23

0

123

4

21

22

23

A22

A20

A21

A3

A2

A1

A0

Address

20