Referring to the Comportable guideline for peripheral device functionality, the module edn 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
- Peripheral Pins for Chip IO: none
| Port Name |
Package::Struct |
Type |
Act |
Width |
Description |
| csrng_cmd |
csrng_pkg::csrng |
req_rsp |
req |
1 |
EDN supports a signal CSRNG application interface. |
| edn |
edn_pkg::edn |
req_rsp |
rsp |
8 |
The collection of peripheral ports supported by edn. The width (4) indicates the number of peripheral ports on a single instance. Due to limitations in the parametrization of top-level interconnects this value is not currently parameterizable. However, the number of peripheral ports may change in a future revision. |
| tl |
tlul_pkg::tl |
req_rsp |
rsp |
1 |
|
| Interrupt Name |
Type |
Description |
| edn_cmd_req_done |
Event |
Asserted when a software CSRNG request has completed. |
| edn_fatal_err |
Event |
Asserted when a FIFO error occurs. |
| Alert Name |
Description |
| recov_alert |
This alert is triggered when entropy bus data matches on consecutive clock cycles. |
| fatal_alert |
This alert triggers (i) if an illegal state machine state is reached, or (ii) if a fatal integrity failure is detected on the TL-UL bus. |
| Countermeasure ID |
Description |
| EDN.CONFIG.REGWEN |
Registers are protected from writes. |
| EDN.CONFIG.MUBI |
Registers have multi-bit encoded fields. |
| EDN.MAIN_SM.FSM.SPARSE |
The EDN main state machine uses a sparse state encoding. |
| EDN.ACK_SM.FSM.SPARSE |
The EDN ACK state machine uses a sparse state encoding. |
| EDN.FIFO.CTR.REDUN |
The FIFO pointers of several FIFOs are implemented with duplicate counters. |
| EDN.CTR.REDUN |
Counter hardening on the generate command maximum requests counter. |
| EDN.MAIN_SM.CTR.LOCAL_ESC |
A mismatch detected inside any EDN counter moves the main state machine into a terminal error state. |
| EDN.CS_RDATA.BUS.CONSISTENCY |
Comparison on successive bus values for genbits returned from csrng that will distribute over the endpoint buses. |
| EDN.TILE_LINK.BUS.INTEGRITY |
Tilelink end-to-end bus integrity scheme. |