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参数资料
| 型号： | S29CL032J0JFAM020 |
| 厂商： | SPANSION LLC |
| 元件分类： | PROM |
| 英文描述： | 1M X 32 FLASH 3.3V PROM, 54 ns, PBGA80 |
| 封装： | 13 X 11 MM, 1 MM PITCH, FORTIFIED, BGA-80 |
| 文件页数： | 16/79页 |
| 文件大小： | 2994K |
| 代理商： | S29CL032J0JFAM020 |
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March 30, 2009 S29CD-J_CL-J_00_B3
S29CD-J & S29CL-J Flash Family
23
Data
She e t
8.2
Asynchronous Read
All memories require access time to output array data. In an asynchronous read operation, data is read from
one memory location at a time. Addresses are presented to the device in random order, and the propagation
delay through the device causes the data on its outputs to arrive asynchronously with the address on its
inputs.
The internal state machine is set for asynchronously reading array data upon device power-up, or after a
hardware reset. This ensures that no spurious alteration of the memory content occurs during the power
transition. No command is necessary in this mode to obtain array data. Standard microprocessor read cycles
that assert valid addresses on the device address inputs produce valid data on the device data outputs. The
device remains enabled for read access until the command register contents are altered.
The device has two control functions which must be satisfied in order to obtain data at the outputs. CE# is the
power control and should be used for device selection (CE# must be set to VIL to read data). OE# is the
output control and should be used to gate data to the output pins if the device is selected (OE# must be set to
VIL in order to read data). WE# should remain at VIH (when reading data).
Address access time (tACC) is equal to the delay from stable addresses to valid output data. The chip enable
access time (tCE) is the delay from the stable addresses and stable CE# to valid data at the output pins. The
output enable access time (tOE) is the delay from the falling edge of OE# to valid data at the output pins
(assuming the addresses have been stable for at least a period of tACC-tOE and CE# has been asserted for at
Figure 8.1 Asynchronous Read Operation
Note
Operation is shown for the 32-bit data bus. For the 16-bit data bus, A-1 is required.
Refer to Section 18.2, Asynchronous Operations on page 56 for timing specifications and to Figure 18.2,
Characteristics table represents the active current specification for reading array data.
8.3
Hardware Reset (RESET#)
The RESET# pin is an active low signal that is used to reset the device under any circumstances. A logic “0”
on this input forces the device out of any mode that is currently executing back to the reset state. RESET#
may be tied to the system reset circuitry. A system reset would thus also reset the device. To avoid a potential
bus contention during a system reset, the device is isolated from the DQ data bus by tristating the data
outputs for the duration of the RESET pulse. All data outputs are “don’t care” during the reset operation.
If RESET# is asserted during a program or erase operation, the RY/BY# output remains low until the reset
operation is internally complete. The RY/BY# pin can be used to determine when the reset operation is
complete. Since the device offers simultaneous read/write operation, the host system may read a bank after a
period of tREADY2, if the bank was in the read/reset mode at the time RESET# was asserted. If one of the
D0
D1
D2
D3
CE#
CLK
ADV#
Addresses
Data
OE#
WE#
IND/WAIT#
VIH
Float
VOH
Address 0
Address 1
Address 2
Address 3
Float
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