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FM25W256-G Fiches technique(PDF) 5 Page - Cypress Semiconductor

No de pièce FM25W256-G
Description  256Kb Wide Voltage SPI F-RAM
Download  16 Pages
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Fabricant  CYPRESS [Cypress Semiconductor]
Site Internet  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

FM25W256-G Fiches technique(HTML) 5 Page - Cypress Semiconductor

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FM25W256 - 256Kb SPI F-RAM
Document Number: 001-84506 Rev. *B
Page 5 of 16
Power Up to First Access
The FM25W256 is not accessible for a period of time
(tPU) after power up.
Users must comply with the
timing parameter tPU, which is the minimum time
from VDD (min) to the first /CS low.
Data Transfer
All data transfers to and from the FM25W256 occur
in 8-bit groups. They are synchronized to the clock
signal (SCK), and they transfer most significant bit
(MSB) first. Serial inputs are registered on the rising
edge of SCK. Outputs are driven from the falling
edge of SCK.
Command Structure
There are six commands called op-codes that can be
issued by the bus master to the FM25W256. They are
listed in the table below. These op-codes control the
functions performed by the memory. They can be
divided
into
three
categories.
First,
there
are
commands that have no subsequent operations. They
perform a single function such as to enable a write
operation. Second are commands followed by one
byte, either in or out. They operate on the status
register. The third group includes commands for
memory transactions followed by address and one or
more bytes of data.
Table 1. Op-code Commands
Name
Description
Op-code
WREN
Set Write Enable Latch
0000 0110b
WRDI
Write Disable
0000 0100b
RDSR
Read Status Register
0000 0101b
WRSR
Write Status Register
0000 0001b
READ
Read Memory Data
0000 0011b
WRITE
Write Memory Data
0000 0010b
WREN – Set Write Enable Latch
The FM25W256 will power up with writes disabled.
The WREN command must be issued prior to any
write operation. Sending the WREN op-code will
allow the user to issue subsequent op-codes for
write operations. These include writing the status
register and writing the memory.
Sending the WREN op-code causes the internal
Write Enable Latch to be set. A flag bit in the status
register, called WEL, indicates the state of the latch.
WEL=1
indicates
that
writes
are
permitted.
Attempting to write the WEL bit in the status
register has no effect on the state of this bit.
Completing any write operation will automatically
clear the write-enable latch and prevent further
writes without another WREN command. Figure 5
illustrates the WREN command bus configuration.
WRDI – Write Disable
The WRDI command disables all write activity by
clearing the Write Enable Latch. The user can verify
that writes are disabled by reading the WEL bit in
the status register and verifying that WEL=0. Figure
6 illustrates the WRDI command bus configuration.
Hi-Z
0
1
2
3
4
5
6
7
0
0
0
0
0
1
1
0
CS
SCK
SI
SO
Figure 5. WREN Bus Configuration


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