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AM29BL162CB90RZI 参数 Datasheet PDF下载

AM29BL162CB90RZI图片预览
型号: AM29BL162CB90RZI
PDF下载: 下载PDF文件 查看货源
内容描述: 16兆位( 1一M× 16位) CMOS 3.0伏只突发模式闪存 [16 Megabit (1 M x 16-Bit) CMOS 3.0 Volt-only Burst Mode Flash Memory]
分类和应用: 闪存
文件页数/大小: 50 页 / 843 K
品牌: SPANSION [ SPANSION ]
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D A T A S H E E T  
LBA#, and BAA# inputs are ignored. The device oper-  
Requirements for Reading Array Data  
Array in Asynchronous (Non-Burst) Mode  
To read array data from the outputs, the system must  
drive the CE# and OE# pins to VIL. CE# is the power  
control and selects the device. OE# is the output control  
and gates array data to the output pins. WE# should re-  
main at VIH.  
ates as a conventional flash device, as described in the  
previous section.  
To enable burst mode operation, the system must issue  
the Burst Mode Enable command sequence (see  
Table 8). After the device has entered the burst mode,  
the system must assert Load Burst Address (LBA#) low  
for one clock period, which loads the starting address  
into the device. The first burst data is available after the  
initial access time (tIACC) from the rising edge of the  
CLK that loads the burst address. After the initial  
access, subsequent burst data is available tBACC after  
each rising edge of CLK.  
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 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  
tACC–tOE time).  
The device increments the address at each rising edge  
of the clock cycles while BAA# is asserted low. The 5-  
bit burst address counter is set to 00000b at the  
starting address. When the burst address counter is  
reaches 11111b, the device outputs the last word in the  
burst sequence, and outputs a low on IND#. If the  
system continues to assert BAA#, on the next CLK the  
device outputs the data for the starting address—the  
burst address counter is “wrapped around” to 00000b.  
For example, if the initial address is xxxx0h, the data  
order is 0-1-2-3…28-29-30-31-0-1…; if the initial  
address is xxxx2h, the data order is 2-3-4-5…28-29-  
30-31-0-1-2-3…; if the initial address is xxxx8h, the  
data order is 8-9-10-11…30-31-0-1-2-3-4-5-6-7-8-9…;  
and so on. Data is repeated if more than 32 clocks are  
supplied, and BAA# remains asserted low.  
The internal state machine is set for reading array  
data in the 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 as-  
sert valid addresses on the device address inputs pro-  
duce valid data on the device data outputs. The device  
remains enabled for read access until the command  
register contents are altered.  
See “Reading Array Data in Non-burst Mode” for more  
information. Refer to the AC Read Operations table for  
timing specifications and to Figure 15 for the timing di-  
agram. ICC1 in the DC Characteristics table represents  
A burst mode read operation is terminated using one of  
three methods:  
the active current specification for reading array data.  
— In the first method, CE# is asserted high. The  
device in this case remains in burst mode;  
asserting LBA# low terminates the previous  
burst read cycle and starts a new burst read  
cycle with the address that is currently valid.  
Requirements for Reading Array Data in  
Synchronous (Burst) Mode  
The device offers fast 32-word sequential burst reads  
and is used to support microprocessors that implement  
an instruction prefetch queue, as well as large data  
transfers during system configuration.  
— In the second method, the Burst Disable  
command sequence is written to the device. The  
device halts the burst operation and returns to  
the asynchronous mode.  
Three additional pins—Load Burst Address (LBA#),  
Burst Address Advance (BAA#), and Clock (CLK)—  
allow interfacing to microprocessors and microcontrol-  
lers with minimal glue logic. Burst mode read is a syn-  
chronous operation tied to the rising edge of CLK. CE#,  
OE#, and WE# are asynchronous (relative to CLK).  
— In the third method, RESET# is asserted low. All  
operations are immediately terminated, and the  
device reverts to the asynchronous mode.  
Note that writing the reset command does not termi-  
nate the burst mode.  
When the device is in asynchronous mode (after  
power-up or RESET# pulse), any signals on the CLK,  
July 8, 2005  
Am29BL162C  
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