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参数资料
| 型号： | W29C040T-90N |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | PROM |
| 英文描述： | 512K X 8 FLASH 5V PROM, 90 ns, PDSO32 |
| 封装： | TSOP1-32 |
| 文件页数： | 25/28页 |
| 文件大小： | 257K |
| 代理商： | W29C040T-90N |
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W29C040
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6.7
Data Polling (DQ7)- Write Status Detection
The W29C040 includes a data polling feature to indicate the end of a write cycle. When the W29C040
is in the internal write cycle, any attempt to read DQ7 of the last byte loaded during the page/byte-load
cycle will receive the complement of the true data. Once the write cycle is completed. DQ7 will show
the true data. See the #DATA Polling Timing Diagram.
6.8
Toggle Bit (DQ6)- Write Status Detection
In addition to data polling, the W29C040 provides another method for determining the end of a write
cycle. During the internal write cycle, any consecutive attempts to read DQ6 will produce alternating
0's and 1's. When the write cycle is completed, this toggling between 0's and 1's will stop. The device
is then ready for the next operation. See Toggle Bit Timing Diagram.
6.9
Product Identification
The product ID operation outputs the manufacturer code and device code. Programming equipment
automatically matches the device with its proper erase and programming algorithms.
The manufacturer and device codes can be accessed by software or hardware operation. In the
software access mode, a six-byte command sequence can be used to access the product ID. A read
from address "00000 hex" outputs the manufacturer code "DA hex." A read from address "00001 hex"
outputs the device code "46 hex." The product ID operation can be terminated by a three-byte
command sequence.
In the hardware access mode, access to the product ID is activated by forcing #CE and #OE low,
#WE high, and raising A9 to 12 volts.
Note: The hardware SID read function is not included in all parts; please refer to Ordering Information for details.
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| W29C101-12 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:x16 Flash EEPROM |
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