Agilex™ 7 FPGAs and SoCs Device Data Sheet: M-Series

ID 769310
Date 9/05/2025
Public
Document Table of Contents

HPS I2C Timing Characteristics

Table 85.  HPS I2C Timing Requirements For specification status, see the Data Sheet Status table
Symbol Description Standard Mode Fast Mode Unit
Minimum Maximum Minimum Maximum
Tclk Serial clock (SCL) clock period 10 2.5 μs
Tclk_jitter I2C clock output jitter 2 2 %
THIGH 129 SCL high period 4 130 0.6 131 μs
TLOW 132 SCL low period 4.7 133 1.3134 μs
TSU;DAT Setup time for serial data line (SDA) data to SCL 0.25 0.1 μs
THD;DAT 135 Hold time for SCL to SDA data 0 3.15 0 0.6 μs
TVD;DAT and TVD;ACK 136 SCL to SDA output data delay 3.45137 0.9 138 μs
TSU;STA Setup time for a repeated start condition 4.7 0.6 μs
THD;STA Hold time for a repeated start condition 4 0.6 μs
TSU;STO Setup time for a stop condition 4 0.6 μs
TBUF SDA high pulse duration between STOP and START 4.7 1.3 μs
Tscl:r 139 SCL rise time 1,000 20 300 ns
Tscl:f 139 SCL fall time 300 6.54 300 ns
Tsda:r 139 SDA rise time 1,000 20 300 ns
Tsda:f 139 SDA fall time 300 6.54 300 ns
Figure 16. I2C Timing Diagram
129 You can adjust Thigh using the ic_ss_scl_hcnt or ic_fs_scl_hcnt register.
130 The recommended minimum setting for ic_ss_scl_hcnt is 428. Refer to the related information for the SCL_High_time equation.
131 The recommended minimum setting for ic_fs_scl_hcnt is 75. Refer to the related information for the SCL_High_time equation.
132 You can adjust Tlow using the ic_ss_scl_lcnt or ic_fs_scl_lcnt register.
133 The recommended minimum setting for ic_ss_scl_lcnt is 464. Refer to the related information for the SCL_Low_time equation.
134 The recommended minimum setting for ic_fs_scl_lcnt is 163. Refer to the related information for the SCL_Low_time equation.
135 THD;DAT is affected by the rise and fall time.
136 TVD;DAT and TVD;ACK are affected by the rise and fall time, as well as the SDA hold time (set by adjusting the ic_sda_hold register).
137 Use maximum SDA_HOLD = 240 to be within the specification.
138 Use maximum SDA_HOLD = 60 to be within the specification.
139 Rise and fall time parameters vary depending on external factors such as the characteristics of the I/O driver, pull-up resistor value, and total capacitance on the transmission line.