7–28
Chapter 7: User Flash Memory in MAX V Devices
Software Support for UFM Block
4. An 8-bit data is transmitted through SI
.
5. nCSis pulled back to high to indicate the end of transmission.
Figure 7–23. WRITE Operation Sequence for Extended Mode
nCS
0
1
2
3
4
5
6
7
8
9
10 11
20 21 22 23 24 25 26 27
36 37 38 39
SCK
SI
8-bit
Instruction
16-bit
Address
02H
16-bit Data In
MSB
MSB
MSB
High Impedance
SO
Figure 7–24 shows the WRITEoperation sequence for Base mode.
Figure 7–24. WRITE Operation Sequence for Base Mode
nCS
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23
SCK
SI
8-bit
Instruction
8-bit
Address
02H
8-bit Data In
MSB
MSB
High Impedance
SO
SECTOR-ERASE
SECTOR-ERASE(SE)is the instruction of erasing one sector of the UFM block. Each
sector contains 256 words. WENbit and the sector must not be protected for SE
operation to be successful. nCSmust be driven high before the instruction is executed
internally. You may poll the nRDYbit in the software status register for the completion
of the internal self-timed SECTOR-ERASEcycle. For SPI Extended mode, the SE
operation is performed in the following sequence, as shown in Figure 7–25:
1. nCSis pulled low.
2. Opcode 00100000is transmitted into the interface.
3. The 16-bit address is sent. The eighth bit (the first seven bits will be discarded) of
the address indicates which sector is erased; a 0 means sector 0 (UFM0) is erased,
and a 1 means sector 1 (UFM1) is erased.
MAX V Device Handbook
January 2011 Altera Corporation
INTEL [ INTEL ]
