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

ID 769310
Date 11/25/2024
Public
Document Table of Contents

HPS I2C Timing Characteristics

Table 80.  HPS I2C Timing Requirements For specification status, see the Data Sheet Status table
Symbol Description Standard Mode Fast Mode Unit
Min Max Min Max
Tclk Serial clock (SCL) clock period 10 2.5 μs
Tclk_jitter I2C clock output jitter 2 2 %
THIGH 120 SCL high period 4121 0.6122 μs
TLOW 123 SCL low period 4.7124 1.3125 μs
TSU;DAT Setup time for serial data line (SDA) data to SCL 0.25 0.1 μs
THD;DAT 126 Hold time for SCL to SDA data 0 3.15 0 0.6 μs
TVD;DAT and TVD;ACK 127 SCL to SDA output data delay 3.45128 0.9129 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 130 SCL rise time 1,000 20 300 ns
Tscl:f 130 SCL fall time 300 6.54 300 ns
Tsda:r 130 SDA rise time 1,000 20 300 ns
Tsda:f 130 SDA fall time 300 6.54 300 ns
Figure 16. I2C Timing Diagram
120 You can adjust Thigh using the ic_ss_scl_hcnt or ic_fs_scl_hcnt register.
121 The recommended minimum setting for ic_ss_scl_hcnt is 428. Refer to the related information for the SCL_High_time equation.
122 The recommended minimum setting for ic_fs_scl_hcnt is 75. Refer to the related information for the SCL_High_time equation.
123 You can adjust Tlow using the ic_ss_scl_lcnt or ic_fs_scl_lcnt register.
124 The recommended minimum setting for ic_ss_scl_lcnt is 464. Refer to the related information for the SCL_Low_time equation.
125 The recommended minimum setting for ic_fs_scl_lcnt is 163. Refer to the related information for the SCL_Low_time equation.
126 THD;DAT is affected by the rise and fall time.
127 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).
128 Use maximum SDA_HOLD = 240 to be within the specification.
129 Use maximum SDA_HOLD = 60 to be within the specification.
130 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.