You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Numonyx <strong>Wireless</strong> <strong>Flash</strong> <strong>Memory</strong> (<strong>W30</strong>)<br />
10.0 Read Operations<br />
10.1 Read Array<br />
The Read Array command places (or resets) the partition in read-array mode and is<br />
used to read data from the flash memory array. Upon initial flash device power-up, or<br />
after reset (RST# transitions from V IL to V IH ), all partitions default to asynchronous<br />
read-array mode.<br />
To read array data from the flash device:<br />
1. Write the Read Array command (FFh) to the CUI and specify the desired word<br />
address.<br />
1. Read from that address.<br />
Note: If a partition is already in read-array mode, you do not need to issue the Read Array<br />
command to read from that partition.<br />
If the Read Array command is written to a partition that is erasing or programming, the<br />
flash device presents invalid data on the bus until the program or erase operation<br />
completes.<br />
After the program or erase finishes in that partition, valid array data can then be read.<br />
If an Erase Suspend or Program Suspend command suspends the WSM, a subsequent<br />
Read Array command places the addressed partition in read-array mode.<br />
The Read Array command functions independently of V PP .<br />
10.2 Read Device ID<br />
The read identifier mode outputs the manufacturer/device identifier, block lock status,<br />
protection register codes, and configuration register data. The identifier information is<br />
contained within a separate memory space on the flash device, and can be accessed<br />
along the 4-Mbit partition address range supplied by the Read Identifier command<br />
(90h) address. Reads from addresses in Table 20 retrieve ID information. Issuing a<br />
Read Identifier command to a partition that is programming or erasing places the<br />
outputs of that partition in read ID mode while the partition continues to program or<br />
erase in the background.<br />
Table 20: <strong>Flash</strong> Device Identification Codes (Sheet 1 of 2)<br />
Item<br />
Address1<br />
Base Offset<br />
Data Description<br />
Manufacturer ID Partition 00h 0089h Numonyx<br />
Device ID Partition 01h<br />
Block Lock Status ( 2 )<br />
Block 02h<br />
8852h 32-Mbit TPD<br />
8853h 32-Mbit BPD<br />
8854h 64-Mbit TPD<br />
8855h 64-Mbit BPD<br />
8856h 128-Mbit TPD<br />
8857h 128-Mbit BPD<br />
D0 = 0 Block is unlocked<br />
D0 = 1 Block is locked<br />
November 2007 Datasheet<br />
Order Number: 290702-13 55
Change language