squishy: gateware: peripheral: Stubbed out the SPI PSRAM Controller

squishy/gateware/peripherals/psram.py

@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+'''
+
+'''
+
+from enum           import IntEnum, auto, unique
+
+from ..platform     import SquishyPlatformType
+from torii          import Elaboratable, Module, Signal
+from torii.lib.fifo import AsyncFIFO
+
+
+@unique
+class SPIPSRAMCmd(IntEnum):
+	''' SPI PSRAM Command Opcodes '''
+	READ          = 0x03
+	WRITE         = 0x02
+	FAST_READ     = 0x0B
+	RESET_ENABLE  = 0x66
+	RESET         = 0x99
+	READ_ID       = 0x9F
+	SET_BURST_LEN = 0xC0
+
+class SPIPSRAM(Elaboratable):
+	'''
+
+	This module primarily implements the SPI interface for the ISSI ``IS66WVS2M8ALL/BLL``/``IS67WVS2M8ALL/BLL``
+	SPI PSRAM. The datasheet can be found `here <https://www.issi.com/WW/pdf/66-67WVS2M8ALL-BLL.pdf>`_.
+
+
+
+	'''
+
+	def __init__(self) -> None:
+		pass
+
+	def elaborate(self, platform: SquishyPlatformType | None) -> Module:
+		m = Module()
+
+
+
+		return m