thanavignesh
New ContributorJoined 2 years ago
User Profile
New Contributor
User Widgets
Contributions
Clarification on rx_st_empty Behavior for Unaligned Transfers (1 DWORD Length) in P-TILE :-
I have a few doubts regarding how the rx_st_empty signal is updated during unaligned transfers where the SOP and EOP are asserted in the same cycle, specifically for a length of 1 DWORD. For a write request with aligned address (e.g., address = 0), the valid data is located in rx_st_tdata[31:0], and the remaining bytes [255:32] are empty , leading to rx_st_empty = 7 (as only 1 DWORD is valid). What happens if the address is unaligned (e.g., address = 4)? The valid DWORD shifts to rx_st_tdata[63:32]. In this case: Will rx_st_empty still update to 7 as before, considering the higher bits [255:64] and [31 : 0] are invalid? Or will it update to 6 since only [255:64] are empty? For other unaligned addresses (e.g., address = 8, C, 10, ..., 1C), where the valid DWORD keeps shifting to the right, how does rx_st_empty update in these cases Especially for .1 dword length case ? For a read request of 1 DWORD length, does rx_st_empty behave similarly to a write request with unaligned addresses, or is its value fixed regardless of alignment? I’d appreciate any insights or examples to clarify how rx_st_empty behaves in such scenarios.Re: Issue with Simulation Stalling in Intel P-Tile Streaming PCIe Gen4 x8 Example Design
Hi wincent, 1.In the provided snippet from the Endpoint, the ref_clk0/1 and coreclkout_hip signals appear to be functioning correctly, and the pin_perst_n along with other reset signals asserted as expected during initialization. However, the p0_reset_status_n signal, an output of the PCIe Hard IP core, remains deasserted, and we lack visibility into the internal logic driving this signal. Are there alternative methods to control or debug the behavior of the reset_status signal? 2.Additionally, what is the typical simulation runtime for the P-Tile example design configured for 4x8 operation with default settings when using Questa 23.4 or other supported versions? Regards, Thanavignesh
