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DS90UB954-Q1: MIPI Test Pattern is YUV422 8 bits or 10?

Vivek Sikri
Intellectual 300 points
Part Number: DS90UB954-Q1

Hello,

I'm trying to interface the DS90UB954 to a reference design for a MIPI receiver supplied by Lattice in their ECP5 FPGA. Rather than trying to get the imager to send data through the Serdes and into the FPGA all at once (Tried and failed) I'm trying to just get a test pattern from the 954 to go into the Lattice part successfully.

If my PGEN_CSI_DI register is set to 0x1E should I be getting YUV422 8 bit or 10 bit format?

Also I want to make sure I'm not entering LP mode. If I set register bit 0x33[1] Continuous clock to 1 then I shouldn't enter LP mode right?

Finally I notice in the fixed colorbar pattern example (7.5.11.4 in the datasheet) the register 0x20 for forwarding is never enabled. Is this needed for the test pattern?

Thanks,

Vivek

  • 0
    TI__Guru** 103215 points

    Hello Vivek,

    0x1E corresponds to YUV422 8 bit, and 0x1F is for YUV422 10 bit. 

    For 0x33[1] = 1 continuous clock mode you are right, there will not be any LP states on the clock but the data lines will always transition back and forth between LP and HS which is normal. 

    If you are doing PATGEN from the SER, then you need forwarding, but if you are doing PATGEN from the DES then you do not need forwarding. Here is a script for YUV422 8 bit which has been verified before. This particular one generates the PATGEN from the remote SER and passes to the DES, but the code can be reworked to have the DES just generate the same pattern by itself.

    Fullscreen 953to954_patgen_YUV_1280x800p-4Lanes-400mbps (1).py Download 
    """
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"""
# Patgen YUV ColorBar 1280x800p60 on 953/954
# Version 0.92

import time

# 953 config
runTime = 3

Alias953 = 0x18
DES954 = 0x60


# Reset 954
board.WriteI2C(DES954, 0x01, 0x01)
time.sleep(1.0)
# CSI enable , continuous clock, 4 lanes
board.WriteI2C(DES954, 0x33, 0x03)
time.sleep(0.1)
# Set CSI_TX_SPEED to select 400Mbps
board.WriteI2C(DES954, 0x1F, 0x03)
time.sleep(0.1)
# Port Control - only Rx0
board.WriteI2C(DES954, 0x0C, 0x01)
time.sleep(0.1)
# Port Selection - only Rx0
board.WriteI2C(DES954, 0x4C, 0x01)
time.sleep(0.1)
# set alias
board.WriteI2C(DES954, 0x5C, Alias953)
time.sleep(0.1)
board.WriteI2C(DES954, 0x20,0x20) # forwarding of all Rx0 to CSI0
time.sleep(0.1)
if (board.ReadI2C(Alias953, 0x00, 0x01) != 0x30):
	print "953 ID Error"
else:
	print "953 ID Ok"

# Reset 953
board.WriteI2C(Alias953, 0x01, 0x01)
time.sleep(1.0)	
# enable pat gen
board.WriteI2C(Alias953, 0xB0, 0x00)
board.WriteI2C(Alias953, 0xB1, 0x01)
board.WriteI2C(Alias953, 0xB2, 0x01) #enable pattern generator

board.WriteI2C(Alias953, 0xB1, 0x02)
board.WriteI2C(Alias953, 0xB2, 0x33) #fixed color pattern, 8 color bars, block size of 5

board.WriteI2C(Alias953, 0xB1, 0x03)
board.WriteI2C(Alias953, 0xB2, 0x1E) #CSI Data Identifier (0x24 = RGB888, 0x2C = RAW12, 0x2B = RAW10)

# 0xA00 = 2560 bytes (= 1280 pixels x2)
board.WriteI2C(Alias953, 0xB1, 0x04)
board.WriteI2C(Alias953, 0xB2, 0x0A) #line size (15:8)
board.WriteI2C(Alias953, 0xB1, 0x05)
board.WriteI2C(Alias953, 0xB2, 0x00) #line size (7:0)

# 0x140 = 320 bytes (= 2560/8)
board.WriteI2C(Alias953, 0xB1, 0x06)
board.WriteI2C(Alias953, 0xB2, 0x01) #bar size (15:8)
board.WriteI2C(Alias953, 0xB1, 0x07)
board.WriteI2C(Alias953, 0xB2, 0x40) #bar size (7:0)

# 0x320 = 800 lines
board.WriteI2C(Alias953, 0xB1, 0x08)
board.WriteI2C(Alias953, 0xB2, 0x03) #active lines per frame (15:8)
board.WriteI2C(Alias953, 0xB1, 0x09)
board.WriteI2C(Alias953, 0xB2, 0x20) #active lines per frame (7:0)

# 0x33F = 831 (VESA Standard)
board.WriteI2C(Alias953, 0xB1, 0x0a)
board.WriteI2C(Alias953, 0xB2, 0x03) #total lines per frame (15:8)
board.WriteI2C(Alias953, 0xB1, 0x0b)
board.WriteI2C(Alias953, 0xB2, 0x3F) #total lines per frame (7:0)

# 10^9/(60x831x10) = 2006 = 0x7D6
board.WriteI2C(Alias953, 0xB1, 0x0c)
board.WriteI2C(Alias953, 0xB2, 0x07) #line period (15:8)
board.WriteI2C(Alias953, 0xB1, 0x0d)
board.WriteI2C(Alias953, 0xB2, 0xD6) #line period (7:0)

# 0x21 = 33 (VESA Standard)
board.WriteI2C(Alias953, 0xB1, 0x0e)
board.WriteI2C(Alias953, 0xB2, 0x21) #vertical back porch

# 0x0A = 10 (VESA Standard)
board.WriteI2C(Alias953, 0xB1, 0x0f)
board.WriteI2C(Alias953, 0xB2, 0x0A) #vertical front porch

board.WriteI2C(Alias953, 0xB1, 0x10) 
board.WriteI2C(Alias953, 0xB2, 0x00) #1st byte of fixed color

board.WriteI2C(Alias953, 0xB1, 0x11)
board.WriteI2C(Alias953, 0xB2, 0x00) #2nd byte of fixed color

board.WriteI2C(Alias953, 0xB1, 0x12)
board.WriteI2C(Alias953, 0xB2, 0xFF) #3rd byte of fixed color

# board.WriteI2C(0xB1, 0x13)
# board.WriteI2C(0xB2, 0xff) #4th byte of fixed color

# board.WriteI2C(0xB1, 0x14)
# board.WriteI2C(0xB2, 0xff) #5th byte of fixed color

# board.WriteI2C(0xB1, 0x15)
# board.WriteI2C(0xB2, 0x00) #6th byte of fixed color

# board.WriteI2C(0xB1, 0x16)
# board.WriteI2C(0xB2, 0x00) #7th byte of fixed color

# board.WriteI2C(0xB1, 0x17)
# board.WriteI2C(0xB2, 0x0f) #8th byte of fixed color

# board.WriteI2C(0xB1, 0x18)
# board.WriteI2C(0xB2, 0xf0) #9th byte of fixed color

# board.WriteI2C(0xB1, 0x19)
# board.WriteI2C(0xB2, 0x00) #10th byte of fixed color

# board.WriteI2C(0xB1, 0x1A)
# board.WriteI2C(0xB2, 0x00) #11th byte of fixed color

# board.WriteI2C(0xB1, 0x1B)
# board.WriteI2C(0xB1, 0x3f) #12th byte of fixed color

# board.WriteI2C(0xB1, 0x1C)
# board.WriteI2C(0xB2, 0xc0) #13th byte of fixed color

# board.WriteI2C(0xB1, 0x1D)
# board.WriteI2C(0xB2, 0x00) #14th byte of fixed color

# board.WriteI2C(0xB1, 0x1E)
# board.WriteI2C(0xB2, 0x00) #15th byte of fixed color

# board.WriteI2C(0xB1, 0x1F)
# board.WriteI2C(0xB2, 0x00) #16th byte of fixed color

    Best Regards,

    Casey