IS25LP064A-RFLA2 datasheet(58/99 Pages) ISSI

58 / 99 page

IS25LP064A/032A

Integrated Silicon Solution, Inc.- www.issi.com

Rev. A

11/06/2015

Read with “8/16/32/64-Byte Wrap Around”

The device is capable of burst read with wrap around in both SPI and QPI mode. The size of burst length is

configurable by using P0, P1, and P2 bits in Read Register. P2 bit (Wrap enable) enables the burst mode

feature. P0 and P1 define the size of burst. Burst lengths of 8, 16, 32, and 64 bytes are supported. By default,

address increases by one up through the entire array. By setting the burst length, the data being accessed can

be limited to the length of burst boundary within a 256 byte page. The first output will be the data at the initial

address which is specified in the instruction. Following data will come out from the next address within the burst

boundary. Once the address reaches the end of boundary, it will automatically move to the first address of the

boundary. CE# high will terminate the command.

For example, if burst length of 8 and initial address being applied is 0h, following byte output will be from

address 00h and continue to 01h,..,07h, 00h, 01h… until CE# terminates the operation. If burst length of 8 and

initial address being applied is FEh(254d), following byte output will be from address FEh and continue to FFh,

F8h, F9h, FAh, FBh, FCh, FDh, and repeat from FEh until CE# terminates the operation.

The command, “SET READ PARAMETERS OPERATION (C0h)”, is used to configure the burst length. If the

following data input is one of

“00h”,”01h”,”02h”, and ”03h”, the device will be in default operation mode. It will be

continuous burst read of the whole array. If the following data input is one of

“04h”,”05h”,”06h”, and ”07h”, the

device will set the burst length as 8,16,32 and 64 respectively.

To exit the burst mode

, another “C0h” command is necessary to set P2 to 0. Otherwise, the burst mode will be

retained until either power down or reset operation. To change burst length

, another “C0h” command should be

executed to set P0 and P1 (Detailed information in Table 6.8 Burst Length Data). All read commands operate in

burst mode once the Read Register is set to enable burst mode.

Refer to Figures 8.40 and 8.41 for instruction sequence.

IS25LP064A-RFLA2 数据表(PDF) 58 Page - Integrated Silicon Solution, Inc