Freescale Semiconductor M9328MX21ADSE user manual Ethernet, UARTs and IrDA Interface

Configuration and Operation

i.MX21

UART1_TXD1 UART1_RXD1

UART1_RTS1

UART1_CTS1

RS232 Transceiver P1 VCC

	UART1
EN	DCE

S1-1

GND

USBH1_TXDM USBH1_RXDP USBH1_RXDM USBH1_RXDP

SD2_D1

SD2_D2

SD2_D3

SD2_D0

RS232 Transceiver

TXD4
RXD4
RTS
CTS
DSR*
CD*
RI*
DTR*	EN

* If enabled by jumper

Software Enable via MMIO Latch

P2

UART4 VCC

DTE

S1-2

GND

UART3_TXD

UART3_RXD

Buffer		Software Enable
	IrDA	via MMIO Latch
		VCC
EN
	EN
		S1-3
		GND
		Software Enable
		via MMIO Latch

Figure 2-7. UARTs and IrDA Interface

2.3.6Ethernet

The ADS is equipped with a Cirrus Logic CS8900A-CQ3Z Crystal LAN ISA Ethernet Controller that can interface with the i.MX21. The CS8900A-CQ3Z has 10BaseT transmit and receive filters and operates in I/O mode. Figure 2-8shows the Ethernet interface.

	M9328MX21ADSE User’s Manual, Rev. A
Freescale Semiconductor	2-7