CV-51002
2015.12.04
62
I2C Timing Characteristics
Symbol
Description
Min
10
0
Typ
—
Unit
ns
Ts
Setup time for MDIO data
Hold time for MDIO data
Th
—
ns
Figure 12: MDIO Timing Diagram
MDC
Td
MDIO_OUT
Th
Tsu
MDIO_IN
I2C Timing Characteristics
Table 50: I2C Timing Requirements for Cyclone V Devices
Standard Mode
Fast Mode
Symbol
Description
Unit
Min
Max
10
Min
—
Max
2.5
—
Tclk
Serial clock (SCL) clock period
SCL high time
—
4.7
4
µs
µs
µs
µs
µs
µs
µs
µs
µs
Tclkhigh
Tclklow
Ts
—
0.6
1.3
0.1
0
SCL low time
—
—
Setup time for serial data line (SDA) data to SCL
Hold time for SCL to SDA data
0.25
0
—
—
Th
3.45
0.2
—
0.9
0.2
—
Td
SCL to SDA output data delay
—
4.7
4
—
Tsu_start
Thd_start
Tsu_stop
Setup time for a repeated start condition
Hold time for a repeated start condition
Setup time for a stop condition
0.6
0.6
0.6
—
—
4
—
—
Cyclone V Device Datasheet
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