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FM25H20-DGTR Arkusz danych(PDF) 8 Page - Cypress Semiconductor

Numer części FM25H20-DGTR
Szczegółowy opis  2Mb Serial 3V F-RAM Memory
Download  16 Pages
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Producent  CYPRESS [Cypress Semiconductor]
Strona internetowa  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

FM25H20-DGTR Arkusz danych(HTML) 8 Page - Cypress Semiconductor

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FM25H20 - 2Mb SPI FRAM
Document Number: 001-85935 Rev. *A
Page 8 of 16
Hold
The /HOLD pin can be used to interrupt a serial
operation without aborting it. If the bus master pulls
the /HOLD pin low while C is low, the current
operation will pause. Taking the /HOLD pin high
while C is low will resume an operation. The
transitions of /HOLD must occur while C is low, but
the C and /S pins can toggle during a hold state.
Figure 9. Memory Write
(WREN must precede WRITE)
Figure 10. Memory Read
Sleep Mode
A
low
power
mode
called
Sleep
Mode
is
implemented on the FM25H20. The device will enter
this low power state when the SLEEP op-code (B9h)
is clocked in, and the device seeing the rising edge of
/S. Once in sleep mode, the C and D pins are ignored
and Q will go to a hi-Z state, but the device continues
to monitor the /S pin. On the next falling edge of /S,
the device will return to normal operation within tREC
(450
s max.). The Q pin remains in a hi-Z state
during the wakeup period. The FM25H20 will not
necessarily respond to an opcode within the wakeup
period. To start the wakeup procedure, the controller
may send a “dummy” read, for example, and wait the
remaining tREC time.
Figure 11. Sleep Mode Entry
S
C
D
Q
Sleep
entry
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
4
5
6
7
0
1
2
3
4
5
6
7
op-code
0
0
0
0
0
0
1
MSB
18-bit Address
x
x
x
x
x
17
3
2
1
0
7
6
5
4
3
2
1
0
LSB
MSB
LSB
Data
1
x
S
C
D
Q
0
1
2
3
4
5
6
7
0
1
2
3
4
5
4
5
6
7
0
1
2
3
4
5
6
7
op-code
0
0
0
0
0
0
1
0
MSB
18-bit Address
x
3
2
1
0
7
6
5
4
3
2
1
0
LSB MSB
LSB
Data
17
6
x
x
x
x
x
S
C
D
Q


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