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GD25B32C データシート(PDF) 35 Page - GigaDevice Semiconductor (Beijing) Inc.

部品番号 GD25B32C
部品情報  3.3V Uniform Sector Dual and Quad Serial Flash
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メーカー  GIGADEVICE [GigaDevice Semiconductor (Beijing) Inc.]
ホームページ  http://www.gigadevice.com/
Logo GIGADEVICE - GigaDevice Semiconductor (Beijing) Inc.

GD25B32C データシート(HTML) 35 Page - GigaDevice Semiconductor (Beijing) Inc.

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3.3V Uniform Sector
Dual and Quad Serial Flash
GD25B32C
35
shifted out during the falling edge of Serial Clock. The command sequence is shown in Figure30. The Read Identification
(RDID) command is terminated by driving CS# to high at any time during data output. When CS# is driven high, the device
is put in the Standby Mode. Once in the Standby Mode, the device waits to be selected, so that it can receive, decode and
execute commands.
Figure 30. Read Identification ID Sequence Diagram
7.27.
High Performance Mode (HPM) (A3H)
The High Performance Mode (HPM) command must be executed prior to Dual or Quad I/O commands when
operating at high frequencies (see fR and fC2 in AC Electrical Characteristics). This command allows pre-charging of
internal charge pumps so the voltages required for accessing the flash memory array are readily available. The
command sequence: CS# goes lowSending A3H command Sending 3-dummy byteCS# goes high. See
Figure31. After the HPM command is executed, the device will maintain a slightly higher standby current (Icc8) than
standard SPI operation. The Release from Power-Down or HPM command (ABH) can be used to return to standard SPI
standby current (Icc1). In addition, Power-Down command (B9H) will also release the device from HPM mode back to
standard SPI standby state.
Figure 31. High Performance Mode Sequence Diagram
0
1
2
3
4
5
6
7
CS#
SCLK
SI
SO
8
9 10
MSB
18 19 20 21
17
6
5
4
3
2
1
0
22 23
16
26 27 28 29
25
30 31
24
7
Capacity
JDID7-JDID0
CS#
SCLK
SI
SO
MSB
Memory Type
JDID15-JDID8
6
5
4
3
2
1
0
7
11 12 13 14 15
9FH
6
5
4
3
2
1
0
7
Manufacturer ID
MSB
Command
Command
0
1
2
3
4
5
6
7
A3H
CS#
SCLK
SI
8
9
29 30 31
MSB
2
1
0
3 Dummy Bytes
23 22
SO
High Performance Mode
HPM
t


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