Specifications

Hardware Description

ID052914 Non-Confidential

2.2.4 External reset requests from the daughterboards

Either daughterboard can issue an external reset request to the motherboard:

1. An external reset is received from the JTAG connector, nSRST, on the CoreTile Express

daughterboard.

2. The Daughterboard Configuration Controller asserts CB_RSTREQ to the MCC on the

motherboard. See Figure 2-2 on page 2-6.

3. The MCC asserts the CB_nRST reset signal. Depending on the setting of

ASSERTNPOR

the generic configuration file

config.txt

, CB_nPOR might also be asserted.

Note

• If only CB_nRST is asserted, a soft reset is performed. The MCC and

Daughterboard Configuration Controller reset the devices in the system, but do not

perform a full re-initialization.

• If only CB_nPOR is also asserted, a hard reset is performed. The MCC and

Daughterboard Configuration Controller perform a full re-initialization.

4. The daughterboards and IO FPGA are reset.

5. The MCC also releases CB_nPOR if it was specified in the configuration file.

MCC releases CB_nRST.

6. The daughterboards enter the run state.

Note

No daughterboard configuration files are read as a result of an external JTAG reset. No

daughterboard re-configuration is performed.