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參數(shù)資料
| 型號： | W19B320BTT-H |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | PROM |
| 英文描述： | 2M X 16 FLASH 3V PROM, 70 ns, PDSO48 |
| 封裝： | TSOP-48 |
| 文件頁數(shù)： | 6/56頁 |
| 文件大?。?/td> | 0K |
| 代理商： | W19B320BTT-H |
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W19B320BT/B DATASHEET
Publication Release Date:Dec.25, 2007
- 14 -
Revisionv A3
The system must initiate the reset command to return a bank to read (or erase-suspend-read) mode if
DQ5 goes high during an active program or erase operation, or the bank is in the AUTOSELECT
mode. See Reset Command section and Requirements for Reading Array Data in the Device Bus
Operations section for more information.
6.2.2
Reset Command
The banks will be to the read or erase-suspend-read mode when writing the reset command. For this
command, the address bits are Don’t Care.
The reset command may be written between the sequential cycles in an erase command sequence
before erasing begins. This resets the bank to which the system was writing to the read mode. Once
erasure begins, however, the device ignores reset commands until the operation is complete.
The reset command may be written between the sequence cycles in a program command sequence
before programming begins. This resets the bank, to which the system was writing to the read mode.
If the program command sequence is written to a bank, in the Erase Suspend mode, writing the reset
command returns that bank to the erase-suspend-read mode. When programming begins, the device
ignores reset commands until the operation is complete.
The reset command may be written between the sequence cycles in an AUTOSELECT command
sequence. When in the AUTOSELECT mode, the reset command must be written to return to the read
mode. If a bank entered into the AUTOSELECT mode while in the Erase Suspend mode, writing the
reset command returns that bank to the erase-suspend-read mode.
If DQ5 goes high during a program or erase operation, writing the reset command returns the banks to
the read mode (or erase-suspend-read mode if that bank was in Erase Suspend).
6.2.3
AUTOSELECT Command Sequence
The AUTOSELECT command sequence provides the host system to access the manufacturer and
device codes, and determine whether a sector is protected or not. This is an alternative method, which
is intended for PROM programmers and requires VID on address pin A9. The AUTOSELECT
command sequence may be written to an address within a bank that is either in the read or erase-
suspend-read mode. When the device is actively programming or erasing in the other bank, the
AUTOSELECT command may not be written.
The first writing two unlock cycles initiate the AUTOSELECT command sequence. This is followed by
a third write cycle that contains the bank address and the AUTOSELECT command. The bank then
enters into the AUTOSELECT mode. The system may read at any address within the same bank
without initiating another AUTOSELECT command sequence:
A read cycle at address (BA) XX00h (where BA is
the bank address) returns the manufacturer code.
A read cycle at address (BA) XX01h in word mode
(or (BA) XX02h in byte mode) returns the device code.
A read cycle to an address containing a sector ad
dress (SA) within the same bank, and the address 02h
on A7-A0 in word mode (or the address 04h on A6-A-1 in byte mode) returns 01h if the sector is
protected or 00h if it is unprotected.
To return to read mode (or erase-suspend-read mode if the bank was previously in Erase Suspend),
the system must write the reset command.
Enter Security Sector/Exit Security Sector Command Sequence
The Security Sector region provides a secured data area containing a random, sixteen-byte electronic
serial number (ESN). The system can access the Security Sector region by issuing the three-cycle
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