X46402 datasheet(13/23 Pages) XICOR

13 / 23 page

X46402

Preliminary Information

No-Password Sequential Read

The host can read sequentially within the un-protected

area of the array after receiving the No-password Com-

mand and an address within the unprotected address

space. The data output is sequential, with the data from

address n followed by the data from n+1. The address

counter for read operations increments all address bits,

allowing the entire un-protected memory array contents

to be serially read during one operation. At the end of the

address space (address 1FFFh) the device goes into an

idle state and a new read sequence must be initiated to

continue reading at another address. Refer to Figure 16

for

the

address,

acknowledge

and

data

transfer

sequence. An acknowledge must follow each 8-bit data

transfer. After the last bit has been read, the host sends a

stop condition with or without a preceding acknowledge.

COMBINED RANDOM/SEQUENTIAL OPERATIONS

A random read and sequential read can be combined,

however there are some limitations. Both password pro-

tected or non-password operations operate in the same

way. After sending a random read command and reading

the ﬁrst byte, continued clocks will return successive

addresses. However, after more than one byte of data is

returned, it is not possible to initiate a new random read,

without issuing a stop and starting a new command. This

also allows multiple random read operations and a

sequential read operation, as long as the last operation is

sequential. Note: A read operation that includes a

random read of the last byte in the memory or OTP

arrays cannot include a sequential read operation.

Figure 13. Password Protected Random Read

Figure 14. Password Protected Sequential Read

Data 0

COMMAND

Read

Password

Read

Password

SDA

Data 0

Wait tWC

ACK POLLING

ACK Polling

Repeated

COMMAND

Command

If ACK, then

Password Matches

Password

Data X

COMMAND

Read

Password

Read

Password

SDA

Data 0

If ACK, then

Wait tWC

ACK POLLING

ACK Polling

Repeated

COMMAND

Command

Password Matches

Password

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