MC68020RC33E Freescale Semiconductor, MC68020RC33E Datasheet - Page 260

• Manufacturer Part Number: MC68020RC33E
• Description: IC MICROPROCESSOR 32BIT 114-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68020RC33E

• Processor Type: M680x0 32-Bit
• Speed: 33MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 114-PGA
• Family Name: M68000
• Device Core: ColdFire
• Device Core Size: 32b
• Frequency (max): 33.33MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 5V
• Operating Supply Voltage (max): 5.25V
• Operating Supply Voltage (min): 4.75V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Through Hole
• Pin Count: 114
• Package Type: PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Lead Free Status / Rohs Status: Compliant

During cachable read cycles, the addressed device must provide valid data over its full
bus width as indicated by DSACK1 / DSACK0 . While instructions are always prefetched as
long-word-aligned accesses, data fetches can occur with any alignment and size.
Because the MC68020/EC020 assumes that the entire data bus port size contains valid
data, cachable data read bus cycles must provide as much data as signaled by the port
size during a bus cycle. To satisfy this requirement, the R/ W signal must be included in
the byte select logic for the MC68020/EC020.
Figure 9-5 shows a block diagram of an MC68020/EC020 system with a single memory
bank. The PAL provides memory-mapped byte select signals for an asynchronous 32-bit
port and unmapped byte select signals for other memory banks or ports. Figure 9-6
provides sample equations for the PAL.
The PAL equations and circuits presented here cannot be the optimal implementation for
every system. Depending on the CPU clock frequency, memory access times, and system
architecture, different circuits may be required.
9-6
Byte
Word
3 Bytes
Long Word
Transfer Size
Table 9-1. Data Bus Activity for Byte, Word, and Long-Word Ports
SIZ1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
SIZ0
Freescale Semiconductor, Inc.
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
For More Information On This Product,
A1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
M68020 USER’S MANUAL
Go to: www.freescale.com
A0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
D31–D24
B W L
B W L
B W L
B W L
B W
B W
B W
B W
B
B
B
B
B
B
B
B
Byte (B), Word (W), Long-Word (L) Ports
Data Bus Active Sections
D23–D16
W L
W L
W L
W L
W L
W L
W L
—
—
W
W
W
W
W
W
W
D15–D8
—
—
—
—
—
—
—
L
L
L
L
L
L
L
L
L
MOTOROLA
D7–D0
—
—
—
—
—
—
L
L
L
L
L
L
L
L
L
L