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

ID 769310
Date 7/15/2024
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 119 SCL high period 4120 0.6121 μs
TLOW 122 SCL low period 4.7123 1.3124 μs
TSU;DAT Setup time for serial data line (SDA) data to SCL 0.25 0.1 μs
THD;DAT 125 Hold time for SCL to SDA data 0 3.15 0 0.6 μs
TVD;DAT and TVD;ACK 126 SCL to SDA output data delay 3.45127 0.9128 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 129 SCL rise time 1,000 20 300 ns
Tscl:f 129 SCL fall time 300 6.54 300 ns
Tsda:r 129 SDA rise time 1,000 20 300 ns
Tsda:f 129 SDA fall time 300 6.54 300 ns
Figure 16. I2C Timing Diagram
119 You can adjust Thigh using the ic_ss_scl_hcnt or ic_fs_scl_hcnt register.
120 The recommended minimum setting for ic_ss_scl_hcnt is 428. Refer to the related information for the SCL_High_time equation.
121 The recommended minimum setting for ic_fs_scl_hcnt is 75. Refer to the related information for the SCL_High_time equation.
122 You can adjust Tlow using the ic_ss_scl_lcnt or ic_fs_scl_lcnt register.
123 The recommended minimum setting for ic_ss_scl_lcnt is 464. Refer to the related information for the SCL_Low_time equation.
124 The recommended minimum setting for ic_fs_scl_lcnt is 163. Refer to the related information for the SCL_Low_time equation.
125 THD;DAT is affected by the rise and fall time.
126 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).
127 Use maximum SDA_HOLD = 240 to be within the specification.
128 Use maximum SDA_HOLD = 60 to be within the specification.
129 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.