參數(shù)資料
型號(hào)： W19B322MTB9G
廠商： WINBOND ELECTRONICS CORP
元件分類： PROM
英文描述： 2M X 16 FLASH 3V PROM, 90 ns, PBGA48
封裝： TFBGA-48
文件頁(yè)數(shù)： 51/52頁(yè)
文件大?。?/td> 1955K
代理商： W19B322MTB9G
W19B32XMT/B
- 8 -
Current is reduced for the duration of the #RESET pulse. When #RESET is held at VSS
0.3V, the
device initiates the CMOS standby current (I
±
CC4). If #RESET is held at VIL but not within VSS ± 0.3V,
the standby current will be greater.
The #RESET pin may be tied to the system-reset circuitry. Thus the system reset would also reset the
device, enabling the system to read the boot-up firmware from the device.
If #RESET is asserted during the program or erase operation, the RY/#BY pin will be at “0” (busy) until
the internal reset operation is complete. If #RESET is asserted when a program or erase operation is
not processing (RY/#BY pin is “1”), the reset operation is completed within a time of tREADY (not during
Embedded Algorithms). After the #RESET pin returns to VIH, the system can read data tRH.
6.1.8 Output Disable Mode
When the #OE input is at VIH, output from the device is disabled. The output pins are set in the high
impedance state.
6.1.9 Autoselect Mode
The autoselect mode offers manufacturer and device identification, as well as sector protection
verification, through identifier codes output on DQ0-DQ7. This mode is primarily intended for
programming equipment to automatically match a device to be programmed with its corresponding
programming algorithm. However, the autoselect codes can also be accessed in-system through the
command register.
When using programming equipment, the autoselect mode requires VID (8.5 V to 12.5 V) on address
pins A9. Address pins A6, A1, and A0 must be as shown in table. In addition, when verifying sector
protection, the sector address must appear on the appropriate highest order address bits. When all
necessary bits have been set as required, the programming equipment may then read the
corresponding identifier code on DQ0-DQ7.
To access the autoselect codes in-system, the host system can issue the autoselect command
through the command register. This method does not require VID. Also refer to the Autoselect
Command Sequence section for more information.
6.1.10 Sector/Sector Block Protection and Unprotection
The hardware sector protection feature disables both program and erase operations in any sectors.
The hardware sector unprotection feature re-enables both program and erase operations in previously
protected sectors. Sector protection/unprotection can be implemented through two methods.
The primary method requires VID on the #RESET pin, and can be implemented either in-system or through
programming equipment. This method uses standard microprocessor bus cycle timing.
The alternate method intended only for programming equipment requires VID on address pin A9 and #OE It
is possible to determine whether a sector is protected or unprotected. See the Autoselect Mode section for
details.
6.1.11 Write Protect (#WP)
The Write Protect function provides a hardware method to protect the certain boot sectors without
using VID. This function is one of two features provided by the #WP/ACC pin.
When the #WP/ACC pin is set at VIL, the device disables program and erase functions in the two
outermost 8 Kbyte boot sectors independently of whether those sectors were protected or unprotected
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