AN2007 Motorola / Freescale Semiconductor, AN2007 Datasheet - Page 11

• Manufacturer Part Number: AN2007
• Description: Evaluating ColdFire in a 68K Target System: MC68340 Gateway Reference Design
• Manufacturer: Motorola / Freescale Semiconductor

EQUATIONS
BG_340
BG_340.CLKF = CLK
BG
BG.CLKF = CLK
BR_DMA
DREQ
SIZ1
340 H/W
SIZ0
;----------------------------------- Simulation Segment ------------
SIMULATION
TRACE_ON BR BG BR_340 BG_340 BG_DMA BR_DMA
SETF /BR /BR_340 /BG_DMA /RESET
CLOCKF CLK
CLOCKF CLK
SETF /BR BR_340
CLOCKF CLK
CLOCKF CLK
SETF BG_DMA
CLOCKF CLK
CLOCKF CLK
SETF BR BR_340
CLOCKF CLK
CLOCKF CLK
= BR_340 * BG_DMA * /BG * /RESET
= BR * BG_DMA * /BG_340 * (BG + /BR_340) * /RESET ; Bus grant to the 5206
= (BR + BR_340) * /RESET
= (DREQ1 + DREQ2) * /RESET
= BG_340 * /RESET * /DSACK0 * DSACK1
= BG_340 * /RESET * DSACK0 * /DSACK1
MC68340 Gateway Reference Design
Appendix A PALASM Control Equations for PAL U8
; Bus grant to the 340 H/W,
; Keeps grant if already granted,
; 340 H/W has priority.
; OR together bus requests.
; DREQ* from the 340 H/W
; Dynamically size the bus for
; Dynamically size the bus
; highest priority.
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