參數(shù)資料
型號(hào)： NAND256W4A2AZA6E
廠商： NUMONYX
元件分類： PROM
英文描述： 16M X 16 FLASH 3V PROM, 12000 ns, PBGA55
封裝： 8 X 10 MM, 1 MM HEIGHT, 0.80 MM PITCH, ROHS COMPLIANT, VFBGA-55
文件頁(yè)數(shù)： 16/58頁(yè)
文件大?。?/td> 1406K
代理商： NAND256W4A2AZA6E
NAND128-A, NAND256-A
Device operations
23/58
Figure 9.
Pointer operations for programming
6.2
Read memory array
Each operation to read the memory area starts with a pointer operation as shown in the
Section 6.1: Pointer operations. Once the area (main or spare) has been selected using the
Read A, Read B or Read C commands three bus cycles are required to input the address of
the data to be read.
The device defaults to Read A mode after power-up or a reset operation.
When reading the following spare area addresses:
●
A0 to A3 (x8 devices)
●
A0 to A2 (x16 devices)
set the start address of the spare area, while the following addresses are ignored:
●
A4 to A7 (x8 devices)
●
A3 to A7 (x16 devices)
Once the Read A or Read C commands have been issued they do not need to be reissued
for subsequent read operations as the pointer remains in the respective area. However, the
Read B command is effective for only one operation; once an operation has been executed
in Area B the pointer returns automatically to Area A. Another Read B command is required
to start another read operation in Area B.
Once a read command is issued two types of operations are available: random read and
page read.
●
Random read
Each time the command is issued the first read is random read.
●
Page read
After the random read access the page data is transferred to the page buffer in a time
of tWHBH (refer to Table 20: AC characteristics for operations for the value). Once the
transfer is complete the Ready/Busy signal goes High. The data can then be read out
sequentially (from the selected column address to the last column address) by pulsing
the Read Enable signal.
●
Sequential row read
After the data in last column of the page is output, if the Read Enable signal is pulsed
ai07591
I/O
Address
Inputs
Data Input
10h
80h
Areas A, B, C can be programmed depending on how much data is input. Subsequent 00h commands can be omitted.
AREA A
00h
Address
Inputs
Data Input
10h
80h
00h
I/O
Address
Inputs
Data Input
10h
80h
Areas B, C can be programmed depending on how much data is input. The 01h command must be re-issued before each program.
AREA B
01h
Address
Inputs
Data Input
10h
80h
01h
I/O
Address
Inputs
Data Input
10h
80h
Only Areas C can be programmed. Subsequent 50h commands can be omitted.
AREA C
50h
Address
Inputs
Data Input
10h
80h
50h
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