Spit xbar into two levels #301
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elliotb-lowrisc
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rebased onto draft pinmux changes |
elliotb-lowrisc
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rebased |
HU90m
previously requested changes
Nov 4, 2024
| % for block in config.blocks: | ||
| % if not block.name == "gpio": | ||
| % if block.name not in ["gpio", "i2c", "spi"]: |
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I think it may be nicer to add field to a block which states which crossbar it should be in. Instead of hard coding certain blocks in the templates.
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Fair enough, I've had a go. How does it look to you now?
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Attempt to reduce the depth of xbar logic on critical timing paths to/from the HyperRAM/SRAM by moving most peripherals from the main cross-bar to a new "peri" (peripheral) sub-crossbar. Keeps addresses the same, but some few devices have increased access latency due to being moved to xbar_peri or to improve QoR. Blocks with increased access latency: timer, system_info, & hw_rev. Blocks with decreased access latency: plic.
elliotb-lowrisc
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Have addressed HU90m's comments, but he is no longer around to approve them
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Current utilisation (as I build it) is:
It also seemed to reduce the bitstream build time by several minutes for me. |
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Attempt to reduce the depth of xbar logic on critical timing paths to/from the HyperRAM/SRAM by moving most peripherals from the main cross-bar to a new "peri" (peripheral) sub-crossbar. Keeps addresses the same, but some few devices have increased access latency due to being moved to xbar_peri or to improve QoR.
Blocks with increased access latency: timer, system_info, & hw_rev.
Blocks with decreased access latency: plic.
Seems to improve timing and area utilisation.