MC68040RC25V Freescale Semiconductor, MC68040RC25V Datasheet - Page 147

• Manufacturer Part Number: MC68040RC25V
• Description: IC MICROPROCESSOR 32BIT 179-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68040RC25V

• Processor Type: M680x0 32-Bit
• Speed: 25MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 179-PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

A brief summary of the bus signal encodings for each access type is listed in Table 7-2.
Additional information on the encodings for the M68040 signals can be found in Section 5
Signal Description.
MOTOROLA
Figure 7-4. Byte Enable Signal Generation and PAL Equation
SIZ0
SIZ1
PAL16L8
U1
MC68040 Byte Data Select Generation.
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A0 A1 SIZ0 SIZ1 NC NC NC NC NC GND NC UUD UMD LMD LLD
NC NC NC NC VCC
/UUD = /A0 * /A1
/UMD = A0 * /A1
/LMD = /A0 * /A1
/LLD =
A0
A1
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+ /SIZ1 * /SIZ0
+ SIZ1 * SIZ0
+ /A1 * /SIZ1
+ SIZ1 * SIZ0
+ /SIZ1 * /SIZ0
+ /SIZ1 * /SIZ0
+ SIZ1 * SIZ0
+ /A1 * /SIZ1
+ SIZ1 * SIZ0
+ /SIZ1 * /SIZ0
A0 * /A1
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M68040 USER’S MANUAL
; directly addressed, any size
; enable every byte for long word size
; enable every byte for line size
; directly addressed, any size
; word aligned, size is word or line
; enable every byte for long word size
; enable every byte for line size
; directly addressed, any size
; enable every byte for long word size
; enable every byte for line size
; directly addressed, any size
; word aligned, word or line size
; enable every byte for long word size
; enable every byte for line size
UPPER UPPER DATA SELECT
D31–D24
UPPER MIDDLE DATA SELECT
D23–D16
LOWER MIDDLE DATA SELECT
D15–D8
LOWER LOWER DATA SELECT
D7–D0
7- 5