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UART/IrDA/CIR Integration
Table 19-17. UART DMA Requests to IVA2.2 Subsystem DMA
DMA
SOURCE
DESCRIPTION
D_DMA_10
UART3_DMA_TX
UART module 3 transmit request
D_DMA_11
UART3_DMA_RX
UART module 3 receive request
19.3.2.3 Wake-up Request
The UART can wake up the system on different events (see
, UART/IrDA/CIR Register
Manual).
One important wake-up generation is event detection on the uarti_cts pin when the system is idle. The
uarti_cts pin uses an asynchronous path to transmit the wake-up request to the system (PRCM), which
enables wake-up capabilities to be active even if all module clocks are off (see
Table 19-18. Wake-Up Requests From PRCM
Wake-Up Pin
PRCM Input
Description
uart1_cts
UART1_SWAKEUP
Wake UART1 (system wake-up capabilities)
uart2_cts
UART2_SWAKEUP
Wake UART2 (system wake-up capabilities)
uart3_cts
UART3_SWAKEUP
Wake UART3 (system wake-up capabilities)
CAUTION
UARTs are not in the WAKEUP power domain, which implies limitations on
wake-up capability. If the CORE power domain is off, UART1 and UART2
cannot wake up the system, because power is not supplied. If the PER power
domain is off, UART3 cannot wake up the system, because power is not
supplied. In these cases, a GPIO multiplexed on the uarti_cts pin can be used
to capture the event and wake up the system. Software must enable this
strategy, if required. See
, General-Purpose Interface, for a full
description of this mechanism.
2889
SWPU177N – December 2009 – Revised November 2010
UART/IrDA/CIR
Copyright © 2009–2010, Texas Instruments Incorporated