Motorola ColdFire MCF5281 - Manual (Page 244)

Signal Descriptions
14-4 Freescale Semiconductor
SDRAM write enable DRAMW Asserted to signify that a DRAM write
cycle is underway. Negated to indicate
a read cycle. O 14-21
SDRAM bank selects SDRAM_CS[1:0] Interface to the chip-select lines of the
SDRAMs within a memory block. O 14-21
SDRAM clock enable SCKE SDRAM clock enable. O 14-22
Clock and Reset Signals
Reset in RSTI Asserted to enter reset exception
processing. I 14-22
Reset out RSTO Automatically asserted with RSTI.
Negation indicates that the PLL has
regained its lock. O 14-22
EXTAL EXTAL Driven by an external clock except
when used as a connection to the
external crystal. I 14-22
XTAL XTAL Internal oscillator connection to the
external crystal. O 14-22
Clock output CLKOUT Reflects the system clock. O 14-22
Chip Configuration Module
Clock mode CLKMOD[1:0] Clock mode select I 14-22
Reset configuration RCON Reset configuration select I 14-22
External Interrupt Signals
External interrupts IRQ[7:1] External interrupt sources. I 14-23
Ethernet Module Signals
(not available on MCF5214 and MCF5216)
Management data EMDIO Transfers control information between
the external PHY and the media
access controller. I/O 14-23
Management data clock EMDC Provides a timing reference to the PHY
for data transfers on the EMDIO signal. O 14-23
Transmit clock ETXCLK Provides a timing reference for
ETXEN, ETXD[3:0], and ETXER. I 14-23
Transmit enable ETXEN Indicates when valid nibbles are
present on the MII. O 14-23
Transmit data 0 ETXD0 Serial output Ethernet data. O 14-23
Collision ECOL Asserted to indicate a collision. I 14-24
Receive clock ERXCLK Provides a timing reference for
ERXDV, ERXD[3:0], and ERXER. I 14-24
Table 14-1. MCF5282 Signal Description (continued)
Signal Name Abbreviation Function I/O Page
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3