at49lh00b4 ATMEL Corporation, at49lh00b4 Datasheet - Page 29

• Manufacturer Part Number: at49lh00b4
• Description: 4-megabit Top Boot, Bottom Partitioned Firmware Hub And Low-pin Count Flash Memory
• Manufacturer: ATMEL Corporation

16.5
3379C–FLASH–3/05
Product ID Read
Table 16-1.
Note:
The Product ID Read mode is used to identify the product type and the manufacturer as Atmel.
Following the Product ID Read command, read cycles from the addresses shown in
retrieve the manufacturer and device ID code. To exit the Product ID Read mode, any valid com-
mand can be written to the device.
Table 16-2.
Code
Manufacturer ID
Device ID
SR
Bit
3:2
7
6
5
4
1
0
1. SR[1] does not provide a continuous indication of the Write-Lock bit, TBL pin, or WP values.
Name
Write State Machine
Status (WSM)
Reserved
Erase Status
Program Status
Reserved
Device Protect
Status
Reserved
The WSM interrogates the Write-Lock bit, TBL pin, or WP pin only after a sector erase or pro-
gram operation. Depending on the attempted operation, it informs the system whether or not
the selected sector is locked.
Status Register (SR)
Product ID Address and Data
(1)
Description
Reserved for future use.
Reserved for future use.
Reserved for future use.
Address
000000H
000001H
0
1
0
1
0
1
0
1
Device is BUSY.
A program or erase cycle is in progress. SR[6-1] values are
invalid when SR[7] is 0.
Device is READY.
The device is ready for any operation.
Erase successful.
The sector erase operation completed successfully.
Erase failed.
The sector erase operation failed. If SR[5,4] are 1, then there
was a command sequence error.
Program successful.
The byte program operation competed successfully.
Program failed.
The program operation failed. If SR[5,4] are 1, then there was
a command sequence error.
Sector is unlocked.
The sector being erased or programmed is unlocked (not
protected).
Sector is hardware write protected or write-locked.
The sector being erased or programmed is either hardware
write protected by the TBL or WP pin, or it is write-locked.
Data
1FH
EDH
AT49LH00B4
Table 16-2
29