MC68LC060ZU75 Freescale Semiconductor, MC68LC060ZU75 Datasheet - Page 166

• Manufacturer Part Number: MC68LC060ZU75
• Description: IC MPU 32BIT 68K 75MHZ 304-TBGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68LC060ZU75

• Processor Type: M680x0 32-Bit
• Speed: 75MHz
• Voltage: 3.3V
• Mounting Type: Surface Mount
• Package / Case: 304-TBGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -

The combination of operand size and alignment determines the number of bus cycles
required to perform a particular memory access. Table 7-3 lists the number of bus cycles
required for different operand sizes with all possible alignment conditions for read and write
cycles. The table confirms that alignment significantly affects bus cycle throughput for non-
cachable accesses. For example, in Figure 7-9 the misaligned long-word operand took three
bus cycles because the byte offset = $1. If the byte offset = $0, then it would have taken one
MOTOROLA
MISCELLANEOUS
ATTRIBUTES
Figure 7-11. Misaligned Long-Word Read Bus Cycle Timing
SIZ1–SIZ0
D31–D24
D23–D16
D15–D8
A31–A2
A1–A0
D7–D0
BCLK
R/W
BS0
BS1
BS2
BS3
TIP
TA
TS
C1
READ
BYTE
BYTE
C2
1
M68060 USER’S MANUAL
BYTE 0
C1
WORD
READ
WORD
C2
2
BYTE 1
BYTE 2
C1
READ
BYTE
BYTE
C2
0
BYTE 3
Bus Operation
7-11