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[v1-10] 2018-Apr-25

AS39513 − Detailed Description

Write Command

The write command is used to write to both EEPROM and

on-chip registers that are memory mapped.

The Write Command Format is below:

where:

ADDR[10:0] – Address of the memory to write to. See the

description of the memory map below for details on what is

mapped to the various memory addresses.

The write command word will be followed by one or more bytes

of data. The first byte will be written to address ADDR, the

second at ADDR+1, and so on. Note that the EEPROM

architecture can only write to one 16-byte page at a time. Care

must be taken to limit the number of data bytes in the Write

Command such that the page boundary is not passed.

Specifically, the number of data bytes must be less than or equal

to 16 – ADDR[3:0]. If the number of bytes written would go

beyond the page boundary at address { ADDR[10:4], 4’b1111 },

then the address counter will effectively wrap around to the

start of the page boundary at { ADDR[10:4], 4’b0000 } and

overwrite bytes at the start of the page.

The actual write operation is initiated by setting CE low. The

DOUT pin will go high when the write is beginning. If SPI mode

has been enabled via the direct command “Set IO Mode”, the

DOUT pin will go low when the write is complete. (If the SPI

mode direct command has not set the device to stay in SPI

mode, the DOUT pin will revert to its non-SPI mode value when

the write is complete.)

As example, the signals for a one-byte write are shown below.

Figure 50:

One-Byte Write

Bit

876543

210

Write

ADDR[10:0]

SCLK

DIN

DOUT

A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 D7 D6 D5 D4 D3 D2 D1 D0

0000

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