github.com/rdolbeau.SBusFPGA
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fix sdram irq polarity (to align with NuBusFPGA modifications)

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This commit is contained in:
Romain Dolbeau 2022-10-31 15:12:07 +01:00
parent 8c2cee307b
commit b4872b4602
1 changed files with 7 additions and 9 deletions
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16
sbus-to-ztex-gateware-migen/sbus_to_fpga_soc.py
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@ -332,10 +332,10 @@ class SBusFPGA(SoCCore):
if (pad_usb_interrupt is None):
print(" ***** ERROR ***** USB requires an interrupt")
assert(False)
sig_usb_interrupt = Signal(reset=1)
sig_usb_interrupt = Signal(reset=1) # active low
# the 74LVC2G07 takes care of the Z state: 1 -> Z on the bus, 0 -> 0 on the bus (asserted interrupt)
self.comb += pad_usb_interrupt.eq(sig_usb_interrupt)
self.comb += sig_usb_interrupt.eq(~self.usb_host.interrupt) ##
self.comb += pad_usb_interrupt.eq(sig_usb_interrupt) # active low
self.comb += sig_usb_interrupt.eq(~self.usb_host.interrupt) # USB host interrupt is active high
#pad_SBUS_DATA_OE_LED = platform.request("SBUS_DATA_OE_LED")
@ -457,10 +457,8 @@ class SBusFPGA(SoCCore):
if (pad_sdram_interrupt is None):
print(" ***** ERROR ***** sdram requires an interrupt")
assert(False)
sig_sdram_interrupt = Signal(reset=1)
# the 74LVC2G07 takes care of the Z state: 1 -> Z on the bus, 0 -> 0 on the bus (asserted interrupt)
self.comb += pad_sdram_interrupt.eq(sig_sdram_interrupt)
self.comb += sig_sdram_interrupt.eq(~self.exchange_with_mem.irq) ##
self.comb += pad_sdram_interrupt.eq(self.exchange_with_mem.irq) # SDRAM interrupt is already active low
_sbus_bus = SBusFPGABus(soc=self,
platform=self.platform,
@ -493,10 +491,10 @@ class SBusFPGA(SoCCore):
#if (pad_sdcard_interrupt is None):
# print(" ***** ERROR ***** sdcard requires an interrupt")
# assert(False)
#sig_sdcard_interrupt = Signal(reset=1)
#sig_sdcard_interrupt = Signal(reset=1) # active low
## the 74LVC2G07 takes care of the Z state: 1 -> Z on the bus, 0 -> 0 on the bus (asserted interrupt)
#self.comb += pad_sdcard_interrupt.eq(sig_sdcard_interrupt)
#self.comb += sig_sdcard_interrupt.eq(~self.sdirq.irq) ##
#self.comb += pad_sdcard_interrupt.eq(sig_sdcard_interrupt) # active low
#self.comb += sig_sdcard_interrupt.eq(~self.sdirq.irq) # SD-card interrupt is active high
if (usb or engine or sdcard or jareth): # jareth only for testing
if (not single_dvma_master):