S70FS01GS datasheet(83/141 Pages) CYPRESS

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S70FS01GS

Document Number: 002-03833 Rev. *C

Page 83 of 141

9.3.6

Data Learning Pattern Read (DLPRD 41h)

The instruction is shifted on SI, then the 8-bit DLP is shifted out on SO. It is possible to read the DLP continuously by providing

multiples of eight clock cycles. The maximum operating clock frequency for the DLPRD command is 133MHz.

Figure 9.16

DLP Read (DLPRD) Command Sequence

9.3.7

Enter 4 Byte Address Mode (4BAM B7h):

The enter 4 Byte Address Mode (4BAM) command sets the volatile Address Length bit (CR2V[7]) to 1 to change most 3 Byte

address commands to require 4 Bytes of address. The Read SFDP (RSFDP) command is the only 3 Byte command that is not

affected by the Address Length bit. RSFDP is required by the JEDEC JESD216 standard to always have only 3 Bytes of address.

A hardware or software reset is required to exit the 4 Byte address mode.

Figure 9.17

Enter 4 Byte Address Mode (4BAM B7h) Command Sequence

9.3.8

Read Any Register (RDAR 65h)

The Read Any Register (RDAR) command provides a way to read all device registers - non-volatile and volatile. The instruction is

followed by a 3 or 4 Byte address (depending on the address length configuration CR2V[7], followed by a number of latency

(dummy) cycles set by CR2V[3:0]. Then the selected register contents are returned. If the read access is continued the same

addressed register contents are returned until the command is terminated - only one register is read by each RDAR command.

The FS01GS requires that 4 Byte address mode is in use for this command so that the 4 Byte address will select the internal upper

or lower FS512S device to read. The 4BAM (B7h) command is used to enter 4 Byte address mode before using the RDAR

command. Address A26 = 0 selects the lower address FS512S and A26 = 1 selects the higher address FS512S.

Reading undefined locations provides undefined data.

The RDAR command may be used during embedded operations to read status register-1 (SR1V).

The RDAR command is not used for reading registers that act as a window into a larger array: ECCSR, PPBAR, and DYBAR. There

are separate commands required to select and read the location in the array accessed.

The RDAR command will read invalid data from the PASS register locations if the ASP Password protection mode is selected by

programming ASPR[2] to 0.

CS#

SCLK

Phase

Instruction

Repeat Register Read

CS#

SCK

Phase

Instruction

Repeat Register Read

CS#

SCK

Phase

Instruction

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