Intel PXA250 and PXA210 manual Signal Pin Descriptions, Introduction

Introduction

•I2C Controller pins

•PWM pins

•2 dedicated GPIOs pins

•Integrated JTAG support

1.2.2Signal Pin Descriptions

Table 1-3defines the signal descriptions for the applications processor.

Table 1-3. Signal Pin Descriptions (Sheet 1 of 7)

Name	Type	Description
Memory Controller Pins
MA[25:0]	OCZ	Memory address bus. This bus signals the address requested for memory accesses.
MD[15:0]	ICOCZ	Memory data bus. D[15:0] are used for 16-bit and 32-bit data modes.
		Memory data bus. D[31:16]: These signals are the upper memory data bus address
MD[31:16]	ICOCZ	bits.
		See Note [1]
nOE	OCZ	Memory output enable. Connect this signal to the output enables of memory devices
		to control their data bus drivers.
nWE	OCZ	Memory write enable. Connect this signal to the write enables of memory devices.
nSDCS[3:0]	OCZ	SDRAM CS for banks 0 through 3. Connect these signals to the chip select (CS) pins
		for SDRAM. nSDCS0 is a three-state signal, while nSDCS1-3 are not three-state.
DQM[3:0]	OCZ	SDRAM DQM for data bytes 0 through 3. Connect these signals to the data output
		mask enables (DQM) for SDRAM.
nSDRAS	OCZ	SDRAM RAS. Connect this signal to the row address strobe (RAS) pins for all banks
		of SDRAM.
nSDCAS	OCZ	SDRAM CAS. Connect this signal to the column address strobe (CAS) pins for all
		banks of SDRAM.
		SDRAM and/or Synchronous Static Memory/SDRAM-like synchronous Flash clock
		enable clock enable.
SDCKE[0]	OC	ConnectSDCKE[0] to the CKE pins of SMROM and SDRAM-timing Synchronous
		Flash.
		The memory controller provides control register bits for deassertion of each SDCKE
		pin.
		SDRAM device clock enable.
		Connect SDCKE[1] to the clock enable pins of SDRAM. It is de-asserted (held low)
SDCKE[1]	OC	during sleep. SDCKE[1] is always deasserted upon reset.
		The memory controller provides control register bits for deassertion of each SDCKE
		pin.
		See Note [1]
		Use these clocks to clock synchronous memory devices:
		SDCLK0 - connected to either SMROM or synchronous Flash devices
SDCLK[2:0]	OCZ	SDCLK1 - connected to SDRAM banks 0/1
		SDCLK2 - connected to SDRAM banks 2/3
		See Note [1]

1-4 PXA250 and PXA210 Applications Processors Design Guide