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器件型号： DS90UB948-Q1
您好：
我们的客户使用 DS90UB983+DS90UB948 设计了一个 SERDES 电路。 当主机长时间（大约 12 小时）暂停播放时、将发生黑屏故障。 此时、监控器的背光正常、DS90UB948 的寄存器值与正常显示时相同。 重置 DS90UB948 后、显示屏可正常显示。 您能帮我分析一下吗？
器件型号： DS90UB948-Q1
您好：
我们的客户使用 DS90UB983+DS90UB948 设计了一个 SERDES 电路。 当主机长时间（大约 12 小时）暂停播放时、将发生黑屏故障。 此时、监控器的背光正常、DS90UB948 的寄存器值与正常显示时相同。 重置 DS90UB948 后、显示屏可正常显示。 您能帮我分析一下吗？
感谢您的支持。 出现问题时、让我添加 947 和 948 的寄存器值。
1.当屏幕电缆长度从 1.5 米变为 10 米时,948 寄存器 0x3B 的值保持为 0x0F。 不确定此值是否正确。
2.这些是正常情况下的寄存器值。
你好、Fushen、
是的、我不确定这在实际中有何意义。 AEQ 将根据电缆长度以不同的方式调整。
如果我想把它放在我的工作台上,并尝试几件事情来看看我是否可以重现你能解释一下这个失败是如何表现的吗?
我们需要一张示波器快照、 其中显示了所有电压轨彼此之间的关系以及与数据表图相似的时间测量值。
如数据表中所述、当您需要对 948 (0x1 = 0x1) 应用软复位时、我怀疑存在一个简单的时序控制问题
此致、
Fadi A.
你好 Fadi、
感谢您的支持。 反馈如下：
1、我们使用 947 和 948
2、故障前后寄存器值之间的比较如下图所示：
3、我们使用逻辑分析仪来测量 947 和 948 自己的时序、下图中显示了时序：
e2e.ti.com/.../2026_2D00_05_2D00_30_5F00_16_2D00_34_2D00_42.rar
4 μ s、示波器捕获 947 侧的时序、如下图所示：
5、我们在超过 10 台机器上遇到此问题、测试步骤如下：系统在没有任何人工操作的情况下持续运行、并且在运行大约 24 小时后可能会遇到此灰屏问题。
你好、Fushen、
为了正确捕获电源序列、我们需要串行器和 DES 侧捕获、并需要放大电源的斜坡时间、以确保其符合数据表建议。 我们需要采集 947 和 948 的电源序列。
我注意到你的转储,你没有应用 947 erratas。 这可能是您在这里遇到的一个已知的罕见问题、称为 AV MUTE。
下面是 947 - 948 的勘误代码示例、请确保应用到您的软件中。
此处可能发生的问题与勘误表 11 有关
#勘误表 11
board.WriteI2C (UB947、0x04、0x90)#防止 AVMUTE 用于非 HDCP 系统
"""
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"""
############################
# DS90UB947-Q1 Init Code Example v1.1
# 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()
# 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()
- Fadi A.
你好 Fadi、
1、您指出的 947 和 948 的开机时间如下：
2、针对您提到的怀疑、我将修改软件进行测试、测试结果将在 24-48 小时内回复。