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> 2700g Video Card
Da_Blitz
post Mar 9 2006, 05:52 AM
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Ok here are the details of my research to date, at the mement i am 1 pin away from being technically able to pull this hack off (GPIO18 for those who are intrested aka RDY, only used for VLIO)

hope this comes in handy, after this the next problem is sourcing chips
CODE
Note this is all 2700G7 specific, i plan to use the 2700G5 as it has suport for external Mem (up to 32MB) and 704KB of SRAM for frame buffers, the 2700G7 has only 16MB of built in MEM with no support for more as well as the FRAME Buffer, depending on which is cheaper + size constraints + avalibility + mem requirements i may change.

2700G  PXA270  Description      Avalible
SYS_nCAS    nSDCAS  System Bus Address Strobe    Yes (off SDRAM)
SYS_MA[25:2]    MA[25:2]    System Bus Address  Yes (off SDRAM and flash)
SYS_MD[31:0]    MD[31:0]    System Bus Data      Yes (off SDRAM and flash)
SYS_nOE  nOE  System Bus Output Enable    Yes (off flash)
SYS_RDnWR    RDnWR  System Bus Read/Write  Yes (off CF card)
SYS_RDY  RDY  System Bus Ready
SYS_nCS[1:0]    nCS[1:0]    System Bus Chip Select  Yes (off flash, mabey, it looks like we could steal it from that second flash slot, there are 6, we need 2 and they cant be used for anything else)
SYS_nWE  nWE  System Bus SRAM Write Enable    Yes (off SDRAM and flash)
SYS_nPWE    nPWE  System Bus VLIO Write Enable    Yes (off CF card)
SYS_DQM[3:0]    DQM[3:0]    System Bus Data Masks  Yes (off SDRAM)

System Bus Signals = 68 pins

For LCD's you get a pixel clock that incicates pixels, an Line Clock which indicates End of line (or HSYNC) and a Frame Clock (VSYNC) so you can see if you get rid of the pixel clock and add timing before clocking and after clocking the pixels out before/after the line/frame clock lines are triggered it would be compatible with a CRT, not sure but it might work with the new DVI connector with out insertint the "blanking", need to do some more research if this (the 2700G) dosen't pay off.

Local Mem Signals = 57 pins (all on PCB)

LCD_IN_DD[17:0]      LCD Data Inputs
LCD_IN_PCLK      Pixel Clock Input
LCD_IN_LCLK      Line Clock Input
LCD_IN_FCLK      Frame Clock Input
LCD_IN_DEN      LCD Data Enable Input

LCD Input Pin Signals = 22 pins (header going to LCD screen on zaurus)

LCD1_DD[23:0]      LCD Data
LCD1_PCLK      LCD Pixel Clock
LCD1_LCLK      LCD Line Clock
LCD1_FCLK      LCD Frame Clock
LCD1_DEN      LCD Data Enable
LCD1_PWM      Allows changing of backlight brightness

LCD2_DD[23:0]      LCD Data
LCD2_PCLK      LCD Pixel Clock
LCD2_LCLK      LCD Line Clock
LCD2_FCLK      LCD Frame Clock
LCD2_DEN      LCD Data Enable
LCD2_PWM      Allows changing of backlight brightness

LCD Output Pin Signals = 29 pins * 2 (primary and secondary) (One semi on board: Internal LCD connector is flat cable)

XTAL_IN    CLOCK Input
XTAL_OUT      CLOCK Input (or outptu depending on how you like it)
CLKIN    Clock input if XTAL_* not used
GPIO    General pourpos IO (Yeah!!)
POLL_FLAG      Connect to GPIO (PXA) for flow controll
nRESET_IN      Reset on LOW
nINT    Interupt to main processor (can i even acsess this line :( )
RSVD    100K pull down to ground resistor on these lines

MISC Pins = 13 Pins (not all connected)

VCC_CORE      Core Power Supply (1.2V 28 pins)
VCC_SYS    System Bus Supply (1.8V, 2.5V 9 pins)
VCC_LM    Local Mem Bus Supply (1.8V 10 pins)
VCC_SDRAM      SDRAM Device Supply (1.8V 13 pins)
VCC_LCD_IN      LCD Input Power (1.8V, 2.5V 2 pins)
VCC_LCD1      Primary LCD interface Power (1.8V, 2.5V, 3.3V 4 pins)
VCC_LCD2      Secondary LCD interface Power (1.8V, 2.5V, 3.3V 4 pins)
VCC_IO    Misc IO Power (3.3V 15 pins)
GND    GND (Come on you should know this 50 pins)
VCCA_CORE_PLL      Core PLL Analog Power (2.5V 1 pin)
VSSA_CORE_PLL      Core PLL Analog Gnd (Gnd 1 pin)
VCCA_DISP_PLL      Display PLL Analog Power (2.5V 1 pin)
VSSA_DISP_PLL      Display PLL Analog Gnd (Gnd 1 pin)
VAA_XTAL      Crystal Osscilator Analog Power (2.5V 1 pin)
VSSA_XTAL      Crystal Osscilator Analog Power (Gnd 1 pin)

Power Pins = 141 (all on PCB)
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