自動修復 Hold Time Violation 的程式

以下程式會自動讀取 timing report 中的 hold time violation，跟據 clock pin name 找到 flip-flop，並且在 flip-flop output pin 的 net 上自動加入 delay cell。反覆執行以上動作直到所有的 hold time violation 都被修復為止。

In Tcl File:

proc fix_hold_time_violations {} {

    report_timing -delay_type min > top_hold.rpt

    set target_pin [exec python get_hold_time_violation.py top_hold.rpt]

    while {$target_pin != {}} {

        set target_net [get_nets -of_objects $target_pin]

        insert_buffer [get_nets $target_net] DELAY_CELL_NAME

        legalize_placement -cells [get_cells -hierarchical {eco_cell*}]

        route_zrt_eco -reroute modified_nets_only

        report_timing -delay_type min > top_hold.rpt

        set target_pin [exec python get_hold_time_violation.py top_hold.rpt]

    }

    derive_pg_connection -power_net VDD -ground_net VSS -power_pin VDD -ground_pin VSS

}

In Python File:

import sys

clock_pin_name1 = "CP"

clock_pin_name2 = "CLK"

if len(sys.argv) == 2:

    fname = sys.argv[1]

    with open(fname, "r") as f:

        lines = f.readlines()

        need_fix = 0

        for i in range(len(lines)):

            line = lines[i]

            if "slack" in line:

                if "VIOLATED" in line:

                    need_fix = 1

                break

        if need_fix:

            start = 0

            for i in range(len(lines)):

                line = lines[i]

                if "clock network delay" in line:

                    start = i

                    break

            if start:

                target_cell = ""

                for i in range(start, len(lines)):

                    line = lines[i]

                    if "/" + clock_pin_name1 in line or "/" + clock_pin_name2 in line:

                        start = i + 1

                        target_cell = line.split()[1][1:-1]

                        break

                if target_cell != "":

                    for i in range(start, len(lines)):

                        line = lines[i]

                        if target_cell in line:

                            start = i + 1

                            target_pin = line.split()[0]

                            print(target_pin)

                            break

自動修復 Short Error 的程式

以下程式利用 IC Compiler 的 verify_lvs 指令回報發生 short error 的 nets，用 python 將 short nets 擷取出來，將其刪除並重新繞線。反覆執行此流程直到所有 short errors 都被修復為止。

In Tcl File:

proc fix_short_nets {} {
    verify_lvs > lvs_result.txt
    set short_nets [exec python get_short_nets.py lvs_result.txt]
    while {$short_nets != {}} {
        remove_net_routing $short_nets
        route_zrt_eco -nets $short_nets -reroute modified_nets_only
        verify_lvs > lvs_result.txt
        set short_nets [exec python3 get_short_nets.py lvs_result.txt]
    }
}

In Python File:

import sys

short_net_list = []

if len(sys.argv) == 2:

    fname = sys.argv[1]

    with open(fname, "r") as f:

        lines = f.readlines()

        record = 0

        for line in lines:

            if "ERROR :" in line and "nets short together." in line:

                record = 1

            elif line == "\n":

                record = 0

            if record and not "ERROR :" in line:

                net = line.split()[0]

                if net != "VDD" and net != "VSS":

                    short_net_list.append(net)

for net in short_net_list:

    print(net, end = ' ')