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FM25V20-G Arkusz danych(PDF) 5 Page - Cypress Semiconductor

Numer części FM25V20-G
Szczegółowy opis  2Mb Serial 3V F-RAM Memory
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Producent  CYPRESS [Cypress Semiconductor]
Strona internetowa  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

FM25V20-G Arkusz danych(HTML) 5 Page - Cypress Semiconductor

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FM25V20 – 2Mb SPI F-RAM
Rev. 3.0
August 2012
Page 5 of 17
Power Up to First Access
The FM25V20 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 /S low.
Data Transfer
All data transfers to and from the FM25V20 occur in
8-bit groups. They are synchronized to the clock
signal (C), and they transfer most significant bit
(MSB) first. Serial inputs are registered on the rising
edge of C. Outputs are driven from the falling edge of
clock C.
Command Structure
There are nine commands called op-codes that can be
issued by the bus master to the FM25V20. 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
FSTRD
Fast Read Memory Data
0000 1011b
WRITE
Write Memory Data
0000 0010b
SLEEP
Enter Sleep Mode
1011 1001b
RDID
Read Device ID
1001 1111b
WREN – Set Write Enable Latch
The FM25V20 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
(WRSR) and writing the memory (WRITE).
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 below
illustrates the WREN command bus configuration.
0
0
0
0
0
1
1
0
S
C
D
Q
Hi-Z
0
1
2
3
4
5
6
7
Figure 5. WREN 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.
0
0
0
0
0
1
0
0
S
C
D
Q
Hi-Z
0
1
2
3
4
5
6
7
Figure 6. WRDI Bus Configuration
RDSR – Read Status Register
The RDSR command allows the bus master to
verify the contents of the Status Register. Reading
Status provides information about the current state
of the write protection features. Following the
RDSR op-code, the FM25V20 will return one byte
with the contents of the Status Register. The Status
Register is described in detail in the section below.


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