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7- 56 M68040 USER’S MANUAL MOTOROLA
040_BR
STATE A
STATE B
STATE C
STATE D
BB
BB Λ 040_BR*
AM_BG, 040_BG*
040_BR V AM_BR*
(a) MC68040 High Priorty, Default Bus Master
AM_BG, 040_BG* AM_BG*, 040_BG
AM_BG*, 040_BG
040_BR
AM_BR, 040_BG*
BB Λ 040_BR
040_BR*
STATE A
STATE B
STATE C
STATE D
BB Λ AM_BR*
BB Λ LOCK* V BB
Λ LOCK Λ LOCKE
AM_BG, 040_BG*
AM_BR* V AM_BR Λ
LOCK Λ LOCKE*
(b) MC68040 Low-Priorty, Default Bus Master
AM_BG, 040_BG* AM_BG*, 040_BG
AM_BG*, 040_BG
040_BR
BB Λ LOCK Λ LOCKE*
BB Λ AM_BR
AM_BR Λ LOCK Λ LOCKE V
AM_BR Λ LOCK*
* Indicates the signal is asserted for that device.
BB* BB*
BB* BB*
Figure 7-37. M68040 Synchronous DMA Arbitration
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