taring77
Full Member level 2
Hi all
i have a 8 layer board problem. its an mcu board with tis chip
IC, MCU, MC9328MX21 -MAPBGA-17x17-289pins frm freescale, a couple of DRAM, Flash, Lan chip etc. When i change the address n data to different layer its not werking well. there is no movement in components. Any one can advise?
Top component - MCU chip & 2xSDRAM
Bottom Component - Flash Lan chip
Omitted a resistor netwerk for new stackup
NEW layout stack up (that hangs alot)
L1 - Address + normal traces to other components
L2 - normal traces but nothing (except ground plane) around the address & data areas (blind via 1-2 for other fanning)
L3 - Data Address fanning (BLind via L1-L3)
L4 - normal traces but nothing (except ground plane) around the address & data areas
L5 - Address + normal traces to other components
L6- Mostly gnd plane
L7- Power Plane
L8 - traces to flash + normal traces to other components
Old layout stack up (that werks but needs improvement)
L1 - Address + Data+ normal traces to other components
L2 -Address + Data+ normal traces to other components (Blind via 1-2)
L3 - Pure Ground Plane
L4 - Data+ normal traces to other components
L5 - normal traces but nothing (except ground plane) around the address & data areas
L6- Data+ normal traces to other components
L7- Power Plane
L8 - traces to flash + normal traces to other components
any comments thanks
i have a 8 layer board problem. its an mcu board with tis chip
IC, MCU, MC9328MX21 -MAPBGA-17x17-289pins frm freescale, a couple of DRAM, Flash, Lan chip etc. When i change the address n data to different layer its not werking well. there is no movement in components. Any one can advise?
Top component - MCU chip & 2xSDRAM
Bottom Component - Flash Lan chip
Omitted a resistor netwerk for new stackup
NEW layout stack up (that hangs alot)
L1 - Address + normal traces to other components
L2 - normal traces but nothing (except ground plane) around the address & data areas (blind via 1-2 for other fanning)
L3 - Data Address fanning (BLind via L1-L3)
L4 - normal traces but nothing (except ground plane) around the address & data areas
L5 - Address + normal traces to other components
L6- Mostly gnd plane
L7- Power Plane
L8 - traces to flash + normal traces to other components
Old layout stack up (that werks but needs improvement)
L1 - Address + Data+ normal traces to other components
L2 -Address + Data+ normal traces to other components (Blind via 1-2)
L3 - Pure Ground Plane
L4 - Data+ normal traces to other components
L5 - normal traces but nothing (except ground plane) around the address & data areas
L6- Data+ normal traces to other components
L7- Power Plane
L8 - traces to flash + normal traces to other components
any comments thanks