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EM4223V3WW11E Datasheet(PDF) 10 Page - EM Microelectronic - MARIN SA |
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EM4223V3WW11E Datasheet(HTML) 10 Page - EM Microelectronic - MARIN SA |
10 / 29 page R EM4223 Copyright © 2005, EM Microelectronic-Marin SA 10 www.emmicroelectronic.com NEXT_SLOT Acknowledges the successful reception of a Transponder transmission by the Reader when valid ie. when received by a Transponder which has just transmitted, and when the command is received in the timing window and when the Signature matches, causing the Transponder to move from the ROUND_ACTIVE to the QUIET states. Causes a Transponder in the ROUND_STANDBY state to move into the ROUND_ACTIVE state. Causes the Transponder Current Slot Counter to increment by one. Causes the Transponder to automatically start a new Round by resetting its Current Slot Counter and randomly selecting a new Reply Slot when the Current Slot Counter has reached the Round Size Value. Acknowledges the successful reception of a Transponder transmission by the Reader when valid ie. when received by a Transponder which has just transmitted, and when the command is received in the timing window and when the Signature matches, causing the Transponder to move from the ROUND_ACTIVE to the QUIET states. Causes a Transponder in the ROUND_STANDBY state to move into the ROUND_ACTIVE state. CLOSE_SLOT Causes a Transponder in the ROUND_STANDBY state to move into the ROUND_ACTIVE state. Causes the Transponder slot counter to increment by one. Causes the Transponder to automatically start a new Round by resetting its Current Slot Counter and randomly selecting a new Reply Slot when the Current Slot Counter has reached the Round Size Value. Causes a Transponder in the ROUND_STANDBY state to move into the ROUND_ACTIVE state. STANDBY_ROUND Causes the Transponder to move to the ROUND_STANDBY state, in which the Transponder does not transmit its identity or data. Causes the Transponder to move to the ROUND_STANDBY state, in which the Transponder does not transmit its identity or data. While in the ROUND_STANDBY state, the random number generator for slot number choosing is running so that transponder slots are not synchronized and thus have maximum spread and randomisation in the Transmit times. When the Transponder exits the ROUND_STANDBY state, it will wait until the next internally generated slot time before re- enabling its data transmit circuitry. RESET_TO_READY Moves the Transponder from its current state to READY state. Moves the Transponder from its current state to READY state. MUTE – this is not an actual command but is an implied command derived from the first low-going pulse of any command. Not used. The Transponder will move to the ROUND_STANDBY state upon reception of the first low-going pulse of any command. This could be any single pulse or the first pulse of the SOF of a valid command. The Transponder will continue to decode the command and if the pulse turns out to be part of a valid command, the Transponder will move to either the READY or the ROUND_ACTIVE state depending on the actual command and the command parameters. If the WUS bit = 0 the Transponder will automatically leave the ROUND_STANDBY state after a timeout period of 2.5 X 176 tag bit periods has elapsed since the last MUTE command (176 bits = maximum Data Message length).This timeout will be reset each time a new implied MUTE command is received. Table 6– Command Operations |
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