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MCP215X/40 DEVELOPER ’S
DAUGHTER BOARD USER ’S GUIDE
Appendix G. MCP215X/40 Connection Sequence Overview
FIGURE G-1:
HIGH-LEVEL MCP215X AND MCP2140 CONNECTION SEQUENCE
Primary Device
Normal Disconnect Mode (NDM)
Send XID Commands
(timeslots n, n+1, ...)
(approximately 70ms
between XID commands)
Finish sending XIDs
(max timeslots - y frames)
Broadcast ID
MCP215X/MCP2140
(Secondary Device)
No Response
XID Response in timeslot y
(claiming this timeslot)
( MCP215X always claims timeslot 2)
(MCP2140 always claims timeslot 0)
No Response to these XIDs
No Response to Broadcast ID
Discovery
Send SNRM Command
(w/ parameters and
connection address)
UA response with parameters
using connect address
Open channel for IAS Queries
Confirm channel open for IAS
Send IAS Queries
Provide IAS responses
Open channel for data
(some devices, such as PDAs, will not
issue this command until data is sent)
Normal Response Mode (NRM)
Send Data or Status
Confirm channel open for data
( MCP2150 CD pin driven Low,
MCP2155/40 DSR pin driven Low)
Send Data or Status
Send Data or Status
Send Data or Status
Shutdown link
Return to NDM state
? 2006 Microchip Technology Inc.
Confirm shutdown
(back to NDM state)
DS51591A-page 81
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