S25FL016A 데이터 시트보기 (PDF) - Spansion Inc.

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S25FL016A

16 Megabit CMOS 3.0 Volt Flash Memory with 50-MHz SPI (Serial Peripheral Interface) Bus

Spansion Inc. 

Data Sheet

9.2

Read Data Bytes at Higher Speed (FAST_READ)

The FAST_READ command reads data from the memory array at the frequency (fSCK) presented at the SCK

input, with a maximum speed of 50 MHz. The host system must first select the device by driving CS# low. The

FAST_READ command is then written to SI, followed by a 3-byte address (A23-A0) and a dummy byte. Each

bit is latched on the rising edge of SCK. The memory array data, at that address, are output serially on SO at

a frequency fSCK, on the falling edge of SCK.

The FAST_READ command sequence is shown in Figure 9.2 and Table 9.4 on page 25. The first byte

specified can be at any location. The device automatically increments to the next higher address after each

byte of data is output. The entire memory array can therefore be read with a single FAST_READ command.

When the highest address is reached, the address counter reverts to 00000h, allowing the read sequence to

continue indefinitely.

The FAST_READ command is terminated by driving CS# high at any time during data output. The device

rejects any FAST_READ command issued while it is executing a program, erase, or Write Status Register

operation, and continues the operation uninterrupted.

Figure 9.2 Read Data Bytes at Higher Speed (FAST_READ) Command Sequence

CS#

SCK

Mode 3

Mode 0

SI

SO

Hi-Z

0 1 2 3 4 5 6 7 8 9 10 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47

Command

24-Bit Address

Dummy Byte

23 22 21

3 21 0 7 6 543 2 1 0

76 5 43 2 10 7

MSB

DATA OUT 1

MSB

DATA OUT 2

9.3

Read Identification (RDID)

The Read Identification (RDID) command outputs the one-byte manufacturer identification, followed by the

two-byte device identification, to the host system.

JEDEC assigns the manufacturer identification byte; for Spansion devices it is 01h. The device manufacturer

assigns the device identification: the first byte provides the memory type; the second byte indicates the

memory capacity. See Table 9.1 on page 18 or Table 9.4 on page 25 for device ID data.

The host system must first select the device by driving CS# low. The RDID command is then written to SI,

and each bit is latched on the rising edge of SCK. The 24-bit device identification data is output from the

memory array on SO at a frequency fSCK, on the falling edge of SCK.

The RDID command sequence is shown in Figure 9.3 and Table 9.4 on page 25.

Driving CS# high after the device identification data has been read at least once terminates the READ_ID

command. Driving CS# high at any time during data output also terminates the RDID operation.

The device rejects any RDID command issued while it is executing a program, erase, or Write Status Register

operation, and continues the operation uninterrupted.

January 7, 2008 S25FL016A_00_C3

S25FL016A

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