Visible to Intel only — GUID: hco1410462736135
Ixiasoft
Visible to Intel only — GUID: hco1410462736135
Ixiasoft
11.9.1. DPRX_AUX_CONTROL
For transaction requests:
- Wait for MSG_READY (in register DPRX_AUX_STATUS) to be 1, or enable the interrupt with AUX_IRQ_EN and wait for the interrupt request.
- Read the transaction request total length from LENGTH.
- Read the transaction request command from DPRX_AUX_COMMAND. This step also clears MSG_READY and LENGTH.
- Read the transaction request data payload from registers DPRX_AUX_BYTE0 to DPRX_AUX_BYTE15 (read LENGTH - 1 bytes).
For transaction replies:
- Wait for READY_TO_TX (in register DPRX_AUX_STATUS) to be 1. Implement a timeout (approximately 10 ms) counter.
- Write registers DPRX_AUX_COMMAND to DPRX_AUX_BYTE18 with transaction command and data payload.
- Write LENGTH with the transaction total message length (1 to 17, 1 for the command plus 1 to 16 for the data payload) and set TX_STROBE to 1. This sequence starts the reply transmission.
The sink asserts the IRQ when AUX_IRQ_EN = 1 and MSG_READY = 1. To deassert IRQ, set AUX_IRQ_EN to 0 or read from DPRX_AUX_COMMAND.
Address: 0x0100
Direction: RW
Reset: 0x00000000
Bit |
Bit Name |
Function |
---|---|---|
31 |
MSG_READY | 0 = Waiting for a request 1 = A request has been completely received |
30 |
READY_TO_TX | 0 = Busy sending a reply or request waiting 1 = Ready to send a reply |
29:9 |
Unused |
|
8 |
AUX_IRQ_EN | Issues an IRQ to Nios II processor when the sink receives an AUX channel transaction from the source. 0 = Disable 1 = Enable |
7 |
TX_STROBE | Writing this bit at 1 starts a reply transmission. Always read this bit as 0. |
6:5 |
Unused |
|
4:0 |
LENGTH | For the next transaction reply, total length of message to be transmitted (1 – 17), for the last received transaction request, total length of message received (1 – 17). |