Bus And Control Signals; Features; Coldfire Bus Signal Summary - Motorola ColdFire MCF5281 User Manual

Chapter 13
External Interface Module (EIM)
This chapter describes data-transfer operations, error conditions, and reset operations.
Chapter 15, "Synchronous DRAM Controller Module," describes DRAM cycles.
Unless otherwise noted, in this chapter, "clock" refers to the
CLKOUT used for the bus.

13.1 Features

The following list summarizes bus operation features:
• Up to 24 bits of address and 32 bits of data
• Access 8-, 16-, and 32-bit data port sizes
• Generates byte, word, longword, and line-size transfers
• Burst and burst-inhibited transfer support
• Optional internal termination for external bus cycles

13.2 Bus and Control Signals

Table 13-1 summarizes MCF5282 bus signals described in Chapter 14, "Signal
Descriptions."
Signal Name
A[23:0]
1
BS
1
CS[6:0]
D[31:0]
1
OE
R/W
SIZ[1:0]
MOTOROLA
Table 13-1. ColdFire Bus Signal Summary
Description
Address bus
Byte selects
Chip selects
Data bus
Output enable
Read/write
Transfer size
Chapter 13. External Interface Module (EIM)
NOTE:
I/O
O
O
O
I/O
O
O
O
CLKOUT Edge
Rising
Falling
Falling
Rising
Falling
Rising
Rising
13-1