ds1307_lcd.tan.summary

通过IIC总线读写实时时钟DS1307

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Timing Analyzer Summary
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Type           : Worst-case tsu
Slack          : N/A
Required Time  : None
Actual Time    : 11.545 ns
From           : sda
To             : DS1307:inst2|sda_buf
From Clock     : --
To Clock       : clk
Failed Paths   : 0

Type           : Worst-case tco
Slack          : N/A
Required Time  : None
Actual Time    : 15.738 ns
From           : lcd12864:inst|data[2]
To             : data[2]
From Clock     : clk
To Clock       : --
Failed Paths   : 0

Type           : Worst-case th
Slack          : N/A
Required Time  : None
Actual Time    : 5.028 ns
From           : rst_n
To             : lcd12864:inst|data[1]
From Clock     : --
To Clock       : clk
Failed Paths   : 0

Type           : Clock Setup: 'clk'
Slack          : N/A
Required Time  : None
Actual Time    : 78.25 MHz ( period = 12.780 ns )
From           : lcd12864:inst|column_cnt[3]
To             : lcd12864:inst|data[3]
From Clock     : clk
To Clock       : clk
Failed Paths   : 0

Type           : Clock Hold: 'clk'
Slack          : Not operational: Clock Skew > Data Delay
Required Time  : None
Actual Time    : N/A
From           : DS1307:inst2|readData_reg[7]
To             : DS1307:inst2|out_sec[7]
From Clock     : clk
To Clock       : clk
Failed Paths   : 24

Type           : Total number of failed paths
Slack          : 
Required Time  : 
Actual Time    : 
From           : 
To             : 
From Clock     : 
To Clock       : 
Failed Paths   : 24

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