7–6
Chapter 7: User Flash Memory in MAX V Devices
UFM Functional Description
UFM Data Register
The UFM data register is 16 bits wide with four control signals: DRSHFT
, DRCLK, DRDin,
and DRDout DRSHFTdistinguishes between clock edges that move data serially from
.
DRDinto DRDoutand clock edges that latch parallel data from the UFM sectors. If the
DRSHFTsignal is high, a clock edge moves data serially through the registers from
DRDinto DRDout. If the DRSHFTsignal is low, a clock edge captures data from the UFM
sector pointed by the address register in parallel. The MSB is the first bit that is seen at
DRDout. The data register DRSHFTsignal is also used to enable the UFM for reading
data. When the DRSHFTsignal is low, the UFM latches data into the data register.
Figure 7–3 shows the UFM data register.
Figure 7–3. UFM Data Register
MAX V UFM Block
Data Register
16
16
DRDin
DRDout
DRCLK
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
D14
D15
MSB
LSB
UFM Program/Erase Control Block
The UFM program/erase control block is used to generate all the control signals
necessary to program and erase the UFM block independently. This block reduces the
number of logic elements (LEs) necessary to implement a UFM controller in the logic
array. It also guarantees correct timing of the control signals to the UFM. A rising edge
on either PROGRAMor ERASEsignal causes this control signal block to activate and begin
sequencing through the program or erase cycle. At this point, for a program
instruction, the data currently in the data register is written to the address pointed to
by the address register.
Only sector erase is supported by the UFM. When an ERASEcommand is executed,
this control block erases the sector whose address is stored in the address register.
When the PROGRAM or ERASE command first activates the program/erase control
block, the BUSYsignal will be driven high to indicate an operation in progress in the
UFM. After the program or erase algorithm is completed, the BUSYsignal is forced
low.
MAX V Device Handbook
January 2011 Altera Corporation
ALTERA [ ALTERA CORPORATION ]
