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M45PE40-VMP6P Datasheet(PDF) 13 Page - STMicroelectronics |
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M45PE40-VMP6P Datasheet(HTML) 13 Page - STMicroelectronics |
13 / 35 page 13/35 M45PE40 Read Identification (RDID) The Read Identification (RDID) instruction allows the 8-bit manufacturer identification to be read, fol- lowed by two bytes of device identification. The manufacturer identification is assigned by JEDEC, and has the value 20h for STMicroelectronics. The device identification is assigned by the device manufacturer, and indicates the memory type in the first byte (40h), and the memory capacity of the device in the second byte (13h). Any Read Identification (RDID) instruction while an Erase or Program cycle is in progress, is not decoded, and has no effect on the cycle that is in progress. The device is first selected by driving Chip Select (S) Low. Then, the 8-bit instruction code for the in- struction is shifted in. This is followed by the 24-bit device identification, stored in the memory, being shifted out on Serial Data Output (Q), each bit be- ing shifted out during the falling edge of Serial Clock (C). The instruction sequence is shown in Figure 9.. The Read Identification (RDID) instruction is termi- nated by driving Chip Select (S) High at any time during data output. When Chip Select (S) is driven High, the device is put in the Standby Power mode. Once in the Standby Power mode, the device waits to be se- lected, so that it can receive, decode and execute instructions. Table 5. Read Identification (RDID) Data-Out Sequence Figure 9. Read Identification (RDID) Instruction Sequence and Data-Out Sequence Manufacturer Identification Device Identification Memory Type Memory Capacity 20h 40h 13h C D S 2 1 3456789 10 11 12 13 14 15 Instruction 0 AI06809b Q Manufacturer Identification High Impedance MSB 15 14 13 3210 Device Identification MSB 16 17 18 28 29 30 31 |
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