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![identification](uploads/565bbdb6d33be7896764d4bf5f33848d/identification.png)
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* *SERVMOD_N* signal is used to enable **Service Mode** for a given Peripheral Board. When in **Service Mode**, Peripheral Board attaches I2C EEPROMS to shared I2C bus and selected backplane I/O lines to JTAG TAP (if the board features an FPGA).
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### Identification procedure:
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1. System Board reads SERVMOD_N state (low = board inserted in a given peripheral slot)
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2. System Board drives SERVMOD_N high to attach identification EEPROM/-s to the shared I2C bus
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1. System Board reads *SERVMOD_N* state (low = board inserted in a given peripheral slot)
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2. System Board drives *SERVMOD_N* high to attach identification EEPROM/-s to the shared I2C bus
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3. System Board reads unique ID and additional information about Peripheral Board and RTM (if present)
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4. After the identification cycle is finished System Board releases SERVMOD_N for this slot. |
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4. After the identification cycle is finished System Board releases *SERVMOD_N* for this slot.
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### JTAG
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* Backplane P1 connector pins have dual IO/JTAG function (selectable with SERVMOD_N):
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* A3 - TDI
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* D3 - TDO
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* B4 - TMS
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* H4 - TCK
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* K4 - nTRST |
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