MCP2140A Microchip Technology, MCP2140A Datasheet - Page 50

• Manufacturer Part Number: MCP2140A
• Description: IrDA Standard Protocol Stack Controller With Fixed 9600 Baud Communication Rate
• Manufacturer: Microchip Technology

MCP2140A
FIGURE B-1:
DS22050A-page 50
Normal Disconnect Mode (NDM)
Discovery
Normal Response Mode (NRM)
Open channel for IAS Queries
(approximately 70 ms
between XID commands)
(max timeslots - y frames)
Primary Device
HIGH LEVEL MCP2140A CONNECTION SEQUENCE
Broadcast ID
Send XID Commands
(timeslots n, n+1, ...)
Finish sending XIDs
Send SNRM Command
(w/ parameters and
connection address)
Open channel for data
Send Data or Status
Send Data or Status
Send IAS Queries
No IR Activity
(for 10 seconds)
No IR Activity
(for 10 seconds)
Shutdown link
(Secondary Device)
XID Response in timeslot y,
claiming this timeslot, (MCP2140A
always claims timeslot 0)
Confirm channel open for data
(MCP2140A DSR pin driven low)
No Response to these XIDs
Send Data or Status
Send Data or Status
PHACT pin driven High
No Response to Broadcast ID
Confirm channel open for IAS
Provide IAS responses
Confirm shutdown
(back to NDM state)
PHACT pin driven Low
PHACT pin driven Low
No Response
UA response with parameters
using connect address
MCP2140A
© 2007 Microchip Technology Inc.