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參數(shù)資料
| 型號： | SMFV016 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | 16M x 8 Bit SmartMedia Card(16M x 8 位 智能媒體卡) |
| 中文描述： | 16米x 8位SmartMedia卡（1,600 × 8位智能媒體卡） |
| 文件頁數(shù)： | 9/24頁 |
| 文件大小： | 293K |
| 代理商： | SMFV016 |
SMFV016
SmartMedia
TM
9
Identifying Invalid Block(s) in the SMFV016
All device locations are erased(FFh) prior to shipping. However, Device with invalid Block(s) will be written with 00h data with in spare
area in the invalid Block(s). This spare area may or may not contain the invalid cell(s). The 00h data just marks the block(s) t hat con-
tains the invalid cell(s). The system must be able to recognize invalid block(s) via the following suggested flow chart (Figure 1).
INVALID BLOCKS
The SMFV016 Flash device may or may not contain up to 20 invalid blocks. Invalid blocks are defined as blocks that contain one
more invalid bits. Typically, an invalid block will contain a single bad bit. Devices with invalid block(s) have the same qualit y level or
as devices with all valid blocks and have the same AC and DC characteristics. An invalid block(s) does not affect the performanc e of
valid block(s) because it is isolated from the bit line and the common source line by a select transistor. The system design mus t be
able to mask out the invalid block(s) via address mapping.
SMFV016 Technical Notes
Figure 1. Flow chart to create invalid block table.
Start
Set : Block = 0
Check "FF"
Set : Block n + 1
Block = 1023
End
invalid block(s) Table
No
No
Yes
Yes
Create (or update)
*
*
For spare area
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