EM260-RTR datasheet(32/50 Pages) SILICONIMAGE

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EM260

120-0260-000M Rev 1.1

Page 32

5.7.3

EM260 Reset

Figure 11. EM260 Reset Example

1. nRESET toggles active low to reset the EM260.

2. nWAKE stays idle high between nRESET and nHOST_INT indicating the EM260 should continue with normal

booting (do not enter the bootloader).

3. nHOST_INT asserts.

4. Activate Slave Select (nSSEL).

5. Transmit the command:



0xFE

: SPI Byte indicating an EZSP Frame



0x03

: Length Byte showing the EZSP Frame is 3 bytes long



0x00

: EZSP Sequence Byte (Note that this value should vary based upon previous sequence bytes)



0x00

: EZSP Frame Control Byte indicating a command with no sleeping



0x06

: EZSP Frame ID Byte indicating the callback command



0xA7

: Frame Terminator

6. Wait for nHOST_INT to assert.

7. Transmit and receive 0xFF until a byte other than 0xFF is received.

8. Receive response 0x00 (a byte other than 0xFF).

9. Receive the Error Byte and decode (0x02 is enumerated as RESET_POWERON).

10. Receive the Frame Terminator (0xA7).

11. Response 0x00 indicates the EM260 has reset and the Host should respond appropriately.

12. Deactivate Slave Select.

13. Since nHOST_INT does not assert again, there is no more data for the Host.

0xA7

0xFE

0x03

0x00

0x06

0xA7

nSSEL

MISO

MOSI

SCLK

0x00

0x02

nHOST_INT

nRESET

Command

Response

Wait

0x00

nWAKE

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