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IC2 FLASH MEMORY
44
I/O
7
PIN DESCRIPTION
I/O 0 ~ I/O7: DATA INPUTS/OUTPUTS
The I/O pins are used to input command,address and data, and to output data during read operations.
The I/O pins float to high-z when the chip is deselected or when the outputs are disabled.
Vcc: POWER Vcc is the power supply for device.
Vss: GROUND
R/B: READY/BUSY OUTPUT
The R/B output indicates the status of the device operation.When low, it indicates that a program, erase or random read operation is in process
and returns to high state upon completion.It is an open drain output and does not float to high-z condition when the chip is deselected or when
outputs are disabled.
RE: READ ENABLE
The RE input is the serial data-out control, and when active drives the data onto the I/O bus. Data is valid tREA after the falling edge of RE which
also increments the internal column address counter by one.
CE: CHIP ENABLE
The CE input is the device selection control. When the device is in the Busy state, CE high is ignored, and the device does not return to standby
mode in program or erase opertion. Regarding CE control during read operation, refer to "Page read" section of Device operation.
CLE: COMMAND LATCH ENABLE
The CLE input controls the activating path for commands sent to the command register. When active high, commands are latched into the
command register through the I/O ports on the rising edge of the WE signal.
ALE: ADDRESS LATCH ENABLE
The ALE input controls the activating path for address to the internal address registers.Addresses are latched on the rising edge of
WE with ALE high.
WE: WRITE ENABLE
The WE input controls writes to the I/O port. Commands, address and data are latched on the rising edge of the WE pulse.
WP: WRITE PROTECT
The WP pin provides inadvertent write/erase protection during power transitions. The internal high voltage generator is reset when the
WP pin is active low.
43
42
41
I/O
I/O
I/O
6
5
4
C3FBVC000001...512MB
FLASH MEMORY
N.C R/B
RE
CE
6
8
9
7
37
36
Vcc
Vss
IC2
Vcc Vss
CLE ALE WE
12
16
13
31
30
29
32
I/O
I/O
I/O
I/O
3
2
1
0
WP
18
19
17
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Troubleshooting
