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Configuration and Operation
M9328MX21ADSE User’s Manual, Rev. A
Freescale Semiconductor 2-7
Figure 2-7. UARTs and IrDA Interface
2.3.6 Ethernet
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 2-8 shows the Ethernet interface.
Buffer
EN
IrDA
EN
UART1_TXD1
UART1_RXD1
UART1_CTS1
UART1_RTS1
RS232 Transceiver
P1
UART1
EN
V
CC
GND
S1-1
Software Enable
via MMIO Latch
RS232 Transceiver
P2
UART4
EN
V
CC
GND
S1-2
Software Enable
via MMIO Latch
V
CC
GND
S1-3
Software Enable
via MMIO Latch
UART3_TXD
UART3_RXD
USBH1_TXDM
USBH1_RXDP
USBH1_RXDM
USBH1_RXDP
SD2_D1
SD2_D2
SD2_D3
SD2_D0
RXD4
RTS
CTS
TXD4
DSR
*
CD
*
R
I*
DTR
*
* If enabled by jumper
DTE
DCE
i.MX21