Physical layer to link layer interface and related systems, methods and devices
Disclosed embodiments relate, generally, to improved data reception handling at a physical layer. Some embodiments relate to end of line systems that include legacy media access control (MAC) devices and PHY devices that implement improved data reception handling disclosed herein. The improved data reception handling improves the operation of legacy systems, and the MAC more specifically, and in some cases to comply with media access tuning protocols implemented at the physical layer.
1. A method comprising: starting a data reception from a shared transmission medium; detecting a collision at the shared transmission medium; waiting to send receive data to a link layer until after a delay period at least partially responsive to detecting the collision; and after ending the data reception from the shared transmission medium, generating signaling for indicating that the shared transmission medium is active, wherein the generating the signaling for indicating that the shared transmission medium is active comprises: asserting, at an output, a first signal for a period equal to the delay period less a period corresponding to an inter-frame gap.
2. The method of claim 1 , wherein the output at which the first signal is asserted is assigned to exclusively signal carrier activity at the shared transmission medium.
3. The method of claim 1 , comprising: de-asserting, at the output, the first signal for a period equal to the inter-frame gap.
4. The method of claim 3 , comprising: finishing providing delayed receive data to an output for sending receive data to the link layer after the first signal is de-asserted.
5. The method of claim 1 , wherein the output at which the first signal is asserted is assigned to exclusively signal carrier activity at the shared transmission medium.
6. The method of claim 1 , comprising: de-asserting, at the output, the first signal for a period equal to an inter-frame gap.
7. The method of claim 1 , wherein the waiting to send receive data to the link layer until after the delay period comprises: waiting to send the receive data to the link layer until after a uniform delay period.
8. A system, comprising: an interface to operatively couple a physical layer side of the system and a link layer side of the system; a receive datapath to move receive data at the physical layer side of the system toward the link layer side of the system, the moving the receive data comprising: starting a data reception from a shared transmission medium;
and delaying at least some of the moving of the receive data until after a delay period at least partially responsive to detection of a collision at the shared transmission medium, and a tuning circuitry of the physical layer side, the tuning circuitry to, after an end of the data reception from the shared transmission medium, generate signaling for indicating that the shared transmission medium is active at least partially by asserting, at an output of the interface, a first signal for a period equal to the delay period less a period corresponding to an inter-frame gap.
9. The system of claim 8 , wherein the receive datapath comprises sensing circuitry to provide a collision signal indicative of a collision at the shared transmission medium, and wherein the receive datapath is to delay some of the moving of the receive data until after the delay period responsive to the collision signal.
10. The system of claim 8 , wherein the output of the interface at which the first signal is asserted is for exclusively signaling carrier activity at the shared transmission medium.
11. The system of claim 8 , wherein the period of the first signal is chosen to end before the receive datapath finishes sending delayed receive data.
12. The system of claim 8 , wherein the tuning circuitry is to generate the signaling for indicating that the shared transmission is active by: de-asserting, at the output, the first signal for a period equal to an inter-frame gap.
13. The system of claim 8 , wherein the tuning circuitry is to generate the signaling for indicating that the shared transmission is active by: de-asserting, at the output, the first signal for a period that ends after the receive datapath finishes sending delayed receive data.
14. The system of claim 8 , wherein the receive datapath comprises a delay circuit to store delayed received data.
15. The system of claim 14 , wherein the delay circuit comprises: a delay line to hold receive data for a period of time; and a delay logic to adjust the period of time that the delay line holds receive data.
16. The system of claim 15 , wherein the delay logic is to initiate the period of time that the delay line holds the receive data responsive to a collision signal.
17. The system of claim 8 , wherein the delaying some of the moving of the receive data until after the delay period comprises: delaying some of the moving of the receive data until after a uniform delay period.
18. The system of claim 8 , comprising a system-in-a-package (SiP), wherein the SiP comprises:
a physical layer side of the system;
a link layer side of the system; and
the interface,
wherein the interface operatively couples the physical layer side of the system and the link layer side of the system.