9–22
Chapter 9: Using User Flash Memory in MAX II Devices
Software Support for UFM Block
ALTUFM I
2
C Interface Timing Specification
shows the timing waveform for the altufm_i2c megafunction read/write
mode.
Figure 9–21.
Timing Waveform for the altufm_i2c Megafunction
SDA
t
HD:DAT
t
SCLSDA
SCL
t
LOW
t
HIGH
t
SU:DAT
t
SU:STA
t
HD:STA
t
SU:STO
t
BUF
through
list the timing specification needed for the altufm_i2c
megafunction read/write mode.
Table 9–6.
I2C Interface Timing Specification
Symbol
F
SCL
t
SCL:SDA
t
BUF
t
HD:STA
t
SU:STA
t
LOW
t
HIGH
t
HD:DAT
t
SU:DAT
t
SU:STO
Parameter
SCL clock frequency
SCL going low to SDA data out
Bus free time between a stop and start condition
(Repeated) start condition hold time
(Repeated) start condition setup time
SCL clock low period
SCL clock high period
SDA data in hold time
SDA data in setup time
STOP condition setup time
Table 9–7.
UFM Write Cycle Time
Parameter
Write Cycle Time
Min
—
Max
110
Unit
µs
Min
—
—
4.7
4
4.7
4.7
4
0
20
4
Max
100
15
—
—
—
—
—
—
—
—
Unit
kHz
ns
µs
µs
µs
µs
µs
ns
ns
ns
Table 9–8.
UFM Erase Cycle Time
Parameter
Sector Erase
Cycle Time
Full Erase Cycle
Time
Min
—
—
Max
501
1,002
Unit
ms
ms
Instantiating the I2C Interface Using the Quartus II altufm Megafunction
shows the altufm megafunction symbol for a I
2
C interface instantiation in
the Quartus II software.
ALTERA [ ALTERA CORPORATION ]
