qh25f320s33b8 Numonyx, qh25f320s33b8 Datasheet - Page 28

• Manufacturer Part Number: qh25f320s33b8
• Description: Numonyx? Serial Flash Memory S33
• Manufacturer: Numonyx

8.2.7
8.2.8
8.2.9
Datasheet
28
These commands can be disabled by executing the Write Disable command as
described in
Fast Read Data Bytes Command (0Bh)
The Fast Read Data Bytes command requires a 3-byte address. After the last address
byte is clocked in (on the rising clock edge), a dummy byte latency occurs (8 clock
cycles) before the first data bit is clocked out on the falling clock edge. Data clocks out
continuously and sequentially as long as S# remains low. Refer to section
8.4.1, “Fast Read” on page 32
command. When the address reaches its maximum, it wraps back to zero. The Fast
Read Data Bytes command supports up to 68 MHz, but it requires a dummy byte to
allow time for the first Read latency.
Clear SR Fail Flags Command (30h)
The Clear SR Fail Flags command resets bit SR5 (Erase Fail Flag) and bit SR6 (Program
Fail Flag). It is not necessary to set the WEL bit before the Clear SR Fail Flags command
is executed. The WEL bit will be unchanged after this command is executed.
Parameter Block Erase Command (40h)
The Parameter Block Erase command is used to erase an 8-KB Parameter block. The
command sequence consists of the OP Code followed by an address within the targeted
block.
As with any command that writes to the device or changes the memory contents, the
Write Enable command must be executed prior to the Parameter Block Erase command
in order to set the WEL bit. The Parameter Block Erase command will be ignored if the
WEL bit is not set.
If the WEL bit is set and one of the following is true:
the erase operation will not occur. Instead, the E_FAIL flag of the Status Register will
set and the WEL bit will clear.
The Parameter Block Erase command can be botched (cancelled) by failing to raise the
S# edge after exactly thirty-two clock cycles. If the Parameter Block Erase command is
botched, the WEL bit will not clear and the E_FAIL flag will not set.
Assuming the WEL bit is set, the address is an unprotected 8-KB Parameter Block
address, and the command is not botched, the rising edge of S# initiates the erase
operation. This erase operation cannot be terminated without powering off the device,
and doing so will result in unexpected data.
• Page Program
• OTP Program
• Bulk Erase
• Parameter Block Erase
• Sector Erase
• the address is not an 8-KB Parameter Block Address
• the address is protected,
Section
8.2.4. The WEL bit is cleared at power-up.
for a detailed description of the Fast Read Data Bytes
Numonyx™ Serial Flash Memory (S33)
Order Number: 314822-03
Section
December 2007