Motorola ColdFire MCF5281 - Manual (Page 261)

Signal Descriptions
Freescale Semiconductor 14-21
14.2.1.10 Transfer In Progress (TIP)
The TIP output is asserted indicating a bus transfer is in progress. It is negated during idle bus cycles. Note
that TIP is held asserted on back-to-back cycles.
NOTE
TIP is not asserted during SDRAM accesses.
This pin can also be configured as GPIO PE0 or SYNCB.
14.2.1.11 Chip Selects (CS[6:0])
Each chip select can be programmed for a base address location and for masking addresses, port size and
burst-capability indication, wait-state generation, and internal/external termination.
Reset clears all chip select programming; CS0 is the only chip select initialized out of reset. CS0 is also
unique because it can function at reset as a global chip select that allows boot ROM to be selected at any
defined address space. The port size for boot CS0 is set during chip configuration by the levels on D[19:18]
on the rising edge of RSTI, as described in
Chapter 27, “Chip Configuration Module (CCM) .” The
chip-select implementation is described in Chapter 12, “Chip Select Module .”
These pins can also be configured as A[23:21] and GPIO PJ[3:0].
14.2.2 SDRAM Controller Signals
These signals are used for SDRAM accesses.
14.2.2.1 SDRAM Row Address Strobe (SRAS)
This output is the SDRAM synchronous row address strobe.
This pin is configured as GPIO PSD5 in single-chip mode.
14.2.2.2 SDRAM Column Address Strobe (SCAS)
This output is the SDRAM synchronous column address strobe.
This pin is configured as GPIO PSD4 in single-chip mode.
14.2.2.3 SDRAM Write Enable (DRAMW)
The DRAM write signal (DRAMW) is asserted to signify that a DRAM write cycle is underway. A read
cycle is indicated by the negation of DRAMW.
This pin is configured as GPIO PSD3 in single-chip mode.
14.2.2.4 SDRAM Bank Selects (SDRAM_CS[1:0])
These signals interface to the chip-select lines of the SDRAMs within a memory block. Thus, there is one
SDRAM_CS line for each memory block (the processor supports two SDRAM memory blocks).
These pins is configured as GPIO PSD[2:1] in single-chip mode.
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3