EM260-RTR datasheet(33/50 Pages) SILICONIMAGE

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EM260

Page 33

120-0260-000M Rev 1.1

5.7.4

Three-Part Transaction: Wake, Get Version, Stack Status Callback

Figure 12. Timing Diagram of the Three-Part Transaction

1. Activate nWAKE and activate timeout timer.

2. EM260 wakes up (if not already) and enables communication.

3. nHOST_INT asserts, indicating the EM260 can accept commands.

4. Host sees nHOST_INT activation within 300ms and deactivates nWAKE and timeout timer.

5. nHOST_INT deasserts immediately after nWAKE.

6. Activate Slave Select.

7. Transmit the Command 0x0A - SPI Protocol Version Request.

8. Transmit the Frame Terminator, 0xA7.

9. Wait for nHOST_INT to assert.

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

11. Receive response 0x82 (a byte other than 0xFF), then receive the Frame Terminator, 0xA7.

12. Bit 7 is always set and bit 6 is always cleared in the Version Response, so this is Version 2.

13. Deactivate Slave Select.

14. Host begins timing the inter-command spacing of 1ms in preparation for sending the next command.

15. nHOST_INT asserts shortly after deactivating Slave Select, indicating a callback.

16. Host sees nHOST_INT, but waits for the 1ms before responding.

17. Activate Slave Select.

18. 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

19. Wait for nHOST_INT to assert.

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

21. Receive response 0xFE (a byte other than 0xFF), read the next byte for a length.

0xA7

0xFE

0x03

0x00

0x06

0xA7

0xFE

0x04

0x82

0xA7

0x0A

0xA7

nSSEL

MISO

MOSI

SCLK

nHOST_INT

0x80

0x19

0x91

nWAKE

Command

Wait

Response

Resp

Wait

Cmd

0x00

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