Digilent 410-181P-KIT - Manual

P P m m o o d d S S F F 2 2 ™ ™ M M e e m m o o r r y y M M o o d d u u l l e e
R R e e f f e e r r e e n n c c e e M M a a n n u u a a l l
Revision: February 8, 2012
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Overview
The PmodSF2 is a peripheral module that
provides 128Mbit (16Mbyte) of serial phase
change memory (PCM). This memory is
accessed through a legacy SPI (serial
peripheral interface) compatible serial
interface.
Features include:
•
Micron P5Q PCM
128Mbit, Quad/Dual/Single Serial
Interface
•
a 12-pin header Pmod interface
connector
•
more than 1,000,000 write cycles
•
high program performance with
low power
•
small form factor (0.80” x 1.00”)
Functional Description
The PmodSF2 is used for easily-accessible
non-volatile memory storage for various
Digilent programmable-logic and embedded-
control system boards.
Note: The PmodSF2 is intended for direct
connection to boards with 12-pin Pmod
headers only. It is not intended for use with
Pmod cables.
The flash memory on the PmodSF2 is provided
by a Micron P5Q PCM integrated circuit. This
memory is organized as 128 sectors of
131,072 (128K) bytes each. Each sector is
organized as 1024 pages of 128 bytes each.
Flash memory must be erased before new
data can be written. The P5Q PCM supports
byte alterability, which allows direct overwrite
and eliminates erase operation. For legacy
compatibility, P5Q PCM supports emulated
erase operation. P5Q allows for a bulk erase or
erase of individual sectors. After a sector has
been erased, individual bytes within the sector
can be written as well as complete pages. The
entire memory can be written as a single write
operation.
Flash memory will eventually wear out after
many erase/program cycles. The P5Q PCM
supports more than 1,000,000 erase/program
cycles per sector before the memory wears
out. Flash memory wear-out is usually not an
issue in routine operation but bugs in the
control software can cause many
erase/program cycles to happen quickly.
Block Diagram