AT45DB321E datasheet(63/80 Pages) RENESAS

63 / 80 page

DS-AT45DB321E-8784 Rev. N

Page 63

9/1/23

AT45DB321E Datasheet

21. Using the RapidS Function

To take advantage of the RapidS function's ability to operate at higher clock frequencies, a full clock cycle must be

used to transmit data back and forth across the serial bus. The DataFlash is designed to always clock its data out

on the falling edge of the SCK signal and clock data in on the rising edge of SCK.

For full clock cycle operation to be achieved, when the DataFlash is clocking data out on the falling edge of SCK,

the host controller must wait until the next falling edge of SCK to latch the data in. Similarly, the host controller

must clock its data out on the rising edge of SCK in order to give the DataFlash a full clock cycle to latch the

incoming data in on the next rising edge of SCK.

Figure 24. RapidS Mode

Figure 25. Command Sequence for Read/Write Operations for Page Size 512 bytes

(Except Status Register Read, Manufacturer and Device ID Read)

Figure 26. Command Sequence for Read/Write Operations for Page Size 528 bytes

(Except Status Register Read, Manufacturer and Device ID Read)

SCK

MOSI

MISO

234567

MOSI = Master Out, Slave In

MISO = Master In, Slave Out

The Master is the host controller and the Slave is the DataFlash.

The Master always clocks data out on the rising edge of SCK and always clocks data in on the falling edge of SCK.

The Slave always clocks data out on the falling edge of SCK and always clocks data in on the rising edge of SCK.

Master clocks out first bit of BYTE-MOSI on the rising edge of SCK

Slave clocks in first bit of BYTE-MOSI on the next rising edge of SCK

Master clocks out second bit of BYTE-MOSI on the same rising edge of SCK

Last bit of BYTE-MOSI is clocked out from the Master

Last bit of BYTE-MOSI is clocked into the slave

Slave clocks out first bit of BYTE-SO

Master clocks in first bit of BYTE-SO

Slave clocks out second bit of BYTE-SO

Master clocks in last bit of BYTE-SO

BYTE-MOSI

MSB

LSB

BYTE-SO

MSB

LSB

Slave

SI (INPUT)

CMD

8-bits

Page Address

(A21 - A9)

LSB

X X X X X X X X

Byte/Buffer Address

(A8 - A0/BFA8 - BFA0)

MSB

2 Dummy

Bits

SI (INPUT)

CMD

8-bits

LSB

X X X X X X X X

MSB

Page Address

(PA12 - PA0)

Byte/Buffer Address

(BA9 - BA0/BFA9 - BFA0)

1 Dummy

Bit

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