Referring to the Comportable guideline for peripheral device functionality, the module i2c has the following hardware interfaces defined
- Primary Clock:
clk_i
- Other Clocks: none
- Bus Device Interfaces (TL-UL):
tl
- Bus Host Interfaces (TL-UL): none
| Pin name | Direction | Description |
|---|
| sda | inout | Serial input data bit |
| scl | inout | Serial input clock bit |
| Port Name | Package::Struct | Type | Act | Width | Description |
|---|
| ram_cfg | prim_ram_1p_pkg::ram_1p_cfg | uni | rcv | 1 | |
| lsio_trigger | logic | uni | req | 1 | Self-clearing status trigger for the DMA. Set when RX TX FIFO is past their configured watermark matching watermark interrupt behaviour. |
| tl | tlul_pkg::tl | req_rsp | rsp | 1 | |
| Interrupt Name | Type | Description |
|---|
| fmt_threshold | Status | host mode interrupt: asserted whilst the FMT FIFO level is below the low threshold. This is a level status interrupt. |
| rx_threshold | Status | host mode interrupt: asserted whilst the RX FIFO level is above the high threshold. This is a level status interrupt. |
| acq_threshold | Status | target mode interrupt: asserted whilst the ACQ FIFO level is above the high threshold. This is a level status interrupt. |
| rx_overflow | Event | host mode interrupt: raised if the RX FIFO has overflowed. |
| controller_halt | Status | host mode interrupt: raised if the controller FSM is halted, such as on an unexpected NACK or lost arbitration. Check CONTROLLER_EVENTS for the reason. The interrupt will be released when the bits in CONTROLLER_EVENTS are cleared. |
| scl_interference | Event | host mode interrupt: raised if the SCL line drops early (not supported without clock synchronization). |
| sda_interference | Event | host mode interrupt: raised if the SDA line goes low when host is trying to assert high |
| stretch_timeout | Event | host mode interrupt: raised if target stretches the clock beyond the allowed timeout period |
| sda_unstable | Event | host mode interrupt: raised if the target does not assert a constant value of SDA during transmission. |
| cmd_complete | Event | host and target mode interrupt. In host mode, raised if the host issues a repeated START or terminates the transaction by issuing STOP. In target mode, raised if the external host issues a STOP or repeated START. |
| tx_stretch | Status | target mode interrupt: raised if the target is stretching clocks for a read command. This is a level status interrupt. |
| tx_threshold | Status | target mode interrupt: asserted whilst the TX FIFO level is below the low threshold. This is a level status interrupt. |
| acq_stretch | Status | target mode interrupt: raised if the target is stretching clocks due to full ACQ FIFO or zero count in TARGET_ACK_CTRL.NBYTES (if enabled). This is a level status interrupt. |
| unexp_stop | Event | target mode interrupt: raised if STOP is received without a preceding NACK during an external host read. |
| host_timeout | Event | target mode interrupt: raised if the host stops sending the clock during an ongoing transaction. |
| Alert Name | Description |
|---|
| fatal_fault | This fatal alert is triggered when a fatal TL-UL bus integrity fault is detected. |
| Countermeasure ID | Description |
|---|
| I2C.BUS.INTEGRITY | End-to-end bus integrity scheme. |