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Part Number: DS90UH947-Q1
Hi Team,
We can bring up the 947+948+display by using internal patgen with external CLK. Now we want to bring up the display by using external LVDS. As I know, 947 doesn't need any initial if we set the correct mode_sel.
We only need follow section 9.1 to bring up the display by using external LVDS, is it correct?
REgards,
Roy
Hello Roy,
Please use the attached code sample to init 947-948 which includes all the errata and best practices for the devices:
"""
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"""
############################
# DS90UB947-Q1 Init Code Example v1.0
# 947->948, Dual FPD-Link STP, 1920x1080@60Hz
############################
import time
import sys
# System dependant variables - adjust according to system
UB947 = 0x18 # 947 I2C Address
UB948 = 0x68 # Remote 948 Address
StartAmbTemp = 25 # Example temperature measured by local sensor on PCB (Ambient temp around 947). In real system this should be read back from temp sensor during initialization
Hres = 1920 # Expected horizontal active resolution
Vres = 1080 # Expected vertical active resolution
def pollstate():
count=0
board.WriteI2C(UB947,0x23,0x80)
board.WriteI2C(UB947,0x24,0x80)
mask = int('11111',2)
state = board.ReadI2C(UB947,0x24,1)
while (state & mask) != 27: #27 = 5'b11011
time.sleep(0.01) #10ms delay
state = board.ReadI2C(UB947,0x24,1)
count = count +1
if count == 10:
print "Error: Serializer is not in Normal state"
return(1)
board.WriteI2C(UB947,0x23,0x0)
board.WriteI2C(UB947,0x24,0x0)
def initsequence():
board.WriteI2C(UB947,0x03,0xDA) # Set I2C passthrough
linked = 0
retry = 0
mask = int('10000000',2)
while linked == 0:
STS = board.ReadI2C(UB947,0x5A,1)
if ((STS & mask) != 0):
linked = 1
print "Deserializer Detected"
else:
time.sleep(0.1)
retry = retry + 1
if retry == 10:
print "Error: No Deserializer Detected"
return()
board.WriteI2C(UB948,0x4A,0x01) # Disable OLDI outputs on 948 to prevent screen glitches from appearing during the init process
##### Init A Sequence
# Errata #5 and 6
board.WriteI2C(UB947,0x5B,0x03) # Force dual FPD-Link, disable reset on PLL frequency change
# Errata #10
board.WriteI2C(UB947,0x16,0x02) # Adjust BCC watchdog timer to minimum
# Errata #11
board.WriteI2C(UB947,0x04,0x90) # Prevent AVMUTE for non-HDCP systems
state_error = pollstate() # Poll 947 state machine prior to applying init B errata
if state_error == 1:
return()
##### Init B Sequence
# Errata #2
board.WriteI2C(UB947,0x40,0x10)
board.WriteI2C(UB947,0x41,0x4A)
board.WriteI2C(UB947,0x42,0x3F)
board.WriteI2C(UB947,0x41,0x4B)
if StartAmbTemp < 10:
board.WriteI2C(UB947,0x42,0x88)
else:
board.WriteI2C(UB947,0x42,0x89)
board.WriteI2C(UB947,0x41,0x49)
board.WriteI2C(UB947,0x42,0x10)
board.WriteI2C(UB947,0x42,0x00)
board.WriteI2C(UB947,0x40,0x14)
board.WriteI2C(UB947,0x41,0x4A)
board.WriteI2C(UB947,0x42,0x3F)
board.WriteI2C(UB947,0x41,0x4B)
if StartAmbTemp < 10:
board.WriteI2C(UB947,0x42,0x88)
else:
board.WriteI2C(UB947,0x42,0x89)
board.WriteI2C(UB947,0x41,0x49)
board.WriteI2C(UB947,0x42,0x10)
board.WriteI2C(UB947,0x42,0x00)
# Errata #3
board.WriteI2C(UB947,0x40,0x10)
board.WriteI2C(UB947,0x41,0x49)
board.WriteI2C(UB947,0x42,0x16)
board.WriteI2C(UB947,0x41,0x47)
board.WriteI2C(UB947,0x42,0x20)
board.WriteI2C(UB947,0x42,0xA0)
board.WriteI2C(UB947,0x42,0x20)
board.WriteI2C(UB947,0x42,0x00)
board.WriteI2C(UB947,0x41,0x49)
board.WriteI2C(UB947,0x42,0x00)
time.sleep(0.01)
##### Timing Confirmation
retry = 0
Hconfirm = 0
Vconfirm = 0
while (retry < 3):
board.WriteI2C(UB948,0x68,0x08) # Enable PATGEN BIST
time.sleep(0.1) # Critical time delay - do not adjust to a shorter value
board.WriteI2C(UB948,0x68,0x19) # H active High monitor
Hhigh = board.ReadI2C(UB948, 0x69, 1)
board.WriteI2C(UB948,0x68,0x09) # H active Low monitor
Hlow = board.ReadI2C(UB948, 0x69, 1)
board.WriteI2C(UB948,0x68,0x39) # V active High monitor
Vhigh = board.ReadI2C(UB948, 0x69, 1)
board.WriteI2C(UB948,0x68,0x29) # V active Low monitor
Vlow = board.ReadI2C(UB948, 0x69, 1)
board.WriteI2C(UB948,0x68,0x00) # Disable PATGEN BIST
mask = int('00111111',2)
hlowmask = Hlow & mask
hhighmask = Hhigh & mask
vlowmask = Vlow & mask
vhighmask = Vhigh & mask
hhighmask = hhighmask << 6
vhighmask = vhighmask << 6
Hactive = hhighmask | hlowmask
Vactive = vhighmask | vlowmask
if Hactive != Hres:
retry = retry + 1
board.WriteI2C(UB947,0x40,0x10) # Reset OLDI PLL
board.WriteI2C(UB947,0x41,0x49)
board.WriteI2C(UB947,0x42,0x16)
board.WriteI2C(UB947,0x41,0x47)
board.WriteI2C(UB947,0x42,0x20)
board.WriteI2C(UB947,0x42,0xA0)
board.WriteI2C(UB947,0x42,0x20)
board.WriteI2C(UB947,0x42,0x00)
board.WriteI2C(UB947,0x41,0x49)
board.WriteI2C(UB947,0x42,0x00)
time.sleep(0.1)
else:
Hconfirm = 1
if Vactive != Vres:
retry = retry + 1
board.WriteI2C(UB947,0x40,0x10) # Reset OLDI PLL
board.WriteI2C(UB947,0x41,0x49)
board.WriteI2C(UB947,0x42,0x16)
board.WriteI2C(UB947,0x41,0x47)
board.WriteI2C(UB947,0x42,0x20)
board.WriteI2C(UB947,0x42,0xA0)
board.WriteI2C(UB947,0x42,0x20)
board.WriteI2C(UB947,0x42,0x00)
board.WriteI2C(UB947,0x41,0x49)
board.WriteI2C(UB947,0x42,0x00)
time.sleep(0.1)
else:
Vconfirm = 1
if (Hconfirm == 1) and (Vconfirm == 1):
break
if (retry > 2):
print "Error: Timing confirmation failed. Double check expected video resolution and OLDI video input"
return()
else:
print "Initialization Complete"
board.WriteI2C(UB948,0x01,0x01) # Digital reset to restart AEQ
time.sleep(0.1) # Allow time for 948 to relock
board.WriteI2C(UB948,0x4A,0x00) # Enable OLDI outputs on 948
initsequence()
Best Regards,
Casey
Hi Casey,
Can you let me know if there is any register can indicate the external LVDS timing from 947 or 948 receive? Like 947LVDS RX and 948 read video data.
Roy
Hello Roy,
The 947 can not directly read any information about the OLDI input aside from the PCLK rate, but 948 can read back the active resolution which is received from 947 with the following script:
import time
UB947 = 0x18
UB948 = 0x58
board.WriteI2C(UB947,0x03,0xDA) # Set I2C passthrough all
board.WriteI2C(UB948,0x68,0x19) # H active High monitor
time.sleep(0.1) # Critical delay! Needed for proper operation!
board.WriteI2C(UB948,0x68,0x19) # Need to write this register again after the delay
Hhigh = board.ReadI2C(UB948, 0x69, 1)
board.WriteI2C(UB948,0x68,0x09) # H active Low monitor
Hlow = board.ReadI2C(UB948, 0x69, 1)
board.WriteI2C(UB948,0x68,0x39) # V active High monitor
Vhigh = board.ReadI2C(UB948, 0x69, 1)
board.WriteI2C(UB948,0x68,0x29) # V active Low monitor
Vlow = board.ReadI2C(UB948, 0x69, 1)
mask = int('00111111',2)
hlowmask = Hlow & mask
hhighmask = Hhigh & mask
vlowmask = Vlow & mask
vhighmask = Vhigh & mask
hhighmask = hhighmask << 6
vhighmask = vhighmask << 6
Hactive = hhighmask | hlowmask
Vactive = vhighmask | vlowmask
print "Detected Resolution = ",Hactive,"x",Vactive
board.WriteI2C(UB948,0x68,0x00) # Disable PGENBIST
Best Regards,
Casey