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Bus Operation
7-8
M68060 USER’S MANUAL
MOTOROLA
Figure 7-8. Byte Select Signal Generation and PAL Equation
A0
A1
SIZ0
SIZ1
UPPER UPPER DATA SELECT
D31–D24
BS0
UPPER MIDDLE DATA SELECT
D23–D16
BS1
LOWER MIDDLE DATA SELECT
D15–D8
BS2
LOWER LOWER DATA SELECT
D7–D0
BS3
PAL16L8
U1
MC68060 Byte Data Select Generation.
A0 A1 SIZ0 SIZ1 NC NC NC NC NC GND NC UUD UMD LMD LLD
NC NC NC NC VCC
/UUD = /A0 * /A1
+ /SIZ1 * /SIZ0
+ SIZ1 * SIZ0
; 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
/UMD = A0 * /A1
+ /A1 * /SIZ1
+ SIZ1 * SIZ0
+ /SIZ1 * /SIZ0
/LMD = /A0 * /A1
+ /SIZ1 * /SIZ0
+ SIZ1 * SIZ0
/LLD = A0 * /A1
+ /A1 * /SIZ1
+ SIZ1 * SIZ0
+ /SIZ1 * /SIZ0
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