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FM25V40-GCTR Datasheet(PDF) 11 Page - Cypress Semiconductor |
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FM25V40-GCTR Datasheet(HTML) 11 Page - Cypress Semiconductor |
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11 / 23 page  PRELIMINARY FM25V40 Document Number: 001-87288 Rev. *A Page 11 of 23 Sleep Mode A low-power sleep mode is implemented on the FM25V20 device. The device will enter the low-power state when the SLEEP opcode B9h is clocked in and a rising edge of CS is applied. When in sleep mode, the SCK and SI pins are ignored and SO will be HI-Z, but the device continues to monitor the CS pin. On the next falling edge of CS, the device will return to normal operation within tREC time. The SO pin remains in a HI-Z state during the wakeup period. The device does not necessarily respond to an opcode within the wakeup period. To start the wakeup procedure, the controller may send a “dummy” read, for example, and wait the remaining tREC time. Device ID The FM25V40 device can be interrogated for its manufacturer, product identification, and die revision. The RDID opcode 9Fh allows the user to read the 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. Figure 15. Sleep Mode Operation CS SCK SI SO HI-Z 0 Enters Sleep Mode VALID IN t SU t REC Recovers from Sleep Mode 10 1 1 1 0 0 1 1 2 3 4 5 6 7 Table 6. Device ID Device ID (9 bytes) Device ID Description 71–16 (56 bits) 15–13 (3 bits) 12–8 (5 bits) 7–6 (2 bits) 5–3 (3 bits) 2–0 (3 bits) Manufacturer ID Product ID Family Density Sub Rev Rsvd 7F7F7F7F7F7FC22640h 0111111101111111011111110111 1111011111110111111111000010 001 00110 01 000 000 Figure 16. Read Device ID CS SCK SO SI Opcode 01 2 3 456 7 0 7 6 5 4 3 2 1 4445 46 55 5657 58596061 6263 64 65 6667 6869 7071 10 0 1 1 1 1 1 LSB MSB HI-Z 47 48 49 50 51 52 53 54 9-Byte Device ID D7 D6 D5 D4 D3 D2 D1 D0 D3 D1 D7 D2 D0 D5 D3 D1 D4 D2 D7 D5 D3 D6 D4 D6 D0 D1 D7 D5 D0 D6 D3 D1 D2 D0 D2 D4 |
Número de pieza similar - FM25V40-GCTR |
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Descripción similar - FM25V40-GCTR |
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