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TMS320F280049: Can't program flash with shared supervisory circuit

Part Number: TMS320F280049

The supervisory circuit is copied from TI demo board. Signal XRSn connect to three micros on the board. When program the flash, there is an error as attached. But if I disconnect XRSn signal to the other two micros, it is able to program.

Memory Map Initialization Complete
C28xx_CPU1: GEL Output: ... DCSM Initialization Start ...
C28xx_CPU1: GEL Output: ... DCSM Initialization Done ...
C28xx_CPU1: GEL Output: ... DCSM Initialization Start ...
C28xx_CPU1: GEL Output: ... DCSM Initialization Done ...
C28xx_CPU1: GEL Output: ... DCSM Initialization Start ...
C28xx_CPU1: GEL Output: ... DCSM Initialization Done ...
C28xx_CPU1: Warning: Failed unlocking device (zone 2) after reset.
C28xx_CPU1: Trouble Setting Breakpoint with the Action "Remain Halted" at 0xc0d4: (Error -1066 @ 0xC0D4) Unable to set/clear requested breakpoint. Verify that the breakpoint address is in valid memory. (Emulation package 9.5.0.00143)
C28xx_CPU1: Breakpoint Manager: Retrying with a AET breakpoint
C28xx_CPU1: Error executing PLL configuration algorithm. Operation cancelled. (0x0)
C28xx_CPU1: Perform a debugger reset and execute the Boot-ROM code (click on the RESUME button in CCS debug window) before erasing/loading the Flash. If that does not help to perform a successful Flash erase/load, check the Reset cause (RESC) register, NMI shadow flag (NMISHDFLG) register and the Boot-ROM status register for further debug.
C28xx_CPU1: File Loader: Memory write failed: Unknown error
C28xx_CPU1: GEL: File: C:\Git\Digital_POL\buck_nonpowerSUITE_F28004x\RELEASE\buck_nonpowerSUITE_F28004x.out: Load failed.