Z8F021ASH020SC datasheet(185/276 Pages) ZILOG

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PS022815-0206

Non-Volatile Data Storage

Z8 Encore! XP® 4K Series

Product Specification

166

If NVDS read performance is critical to your software architecture, there are some things

you can do to optimize your code for speed, listed in order from most helpful to least help-

ful:

• Periodically refresh all addresses that are used. The optimal use of NVDS in terms of speed

is to rotate the writes evenly among all addresses planned to use, bringing all reads closer

to the minimum read time. Because the minimum read time is much less than the write

time, however, actual speed benefits are not always realized.

• Use as few unique addresses as possible: this helps to optimize the impact of refreshing as

well as minimize the requirement for it.

Table 107. NVDS Read Time

Operation

Minimum

Latency

Maximum

Latency

Read (16 byte array)

875

9961

Read (64 byte array)

876

8952

Read (128 byte array)

883

7609

Write (16 byte array)

4973

5009

Write (64 byte array)

4971

5013

Write (128 byte array)

4984

5023

Illegal Read

Illegal Write

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