Register 53: Ethernet MAC Transmit Poll Demand (EMACTXPOLLD), offset
0xC04
The MAC Transmit Poll Demand (EMACTXPOLLD) register enables the TX DMA to check whether
or not the DMA owns the current descriptor. The Transmit Poll Demand command is given to wake
up the TX DMA if it is in the suspend mode. The TX DMA can go into the SUSPEND mode because
of an underflow error in a transmitted frame or the unavailability of descriptors owned by it. This
Transmit Poll Demand command can be given at any time and the TX DMA resets this command
when it again starts fetching the current descriptor from host memory.
Ethernet MAC Transmit Poll Demand (EMACTXPOLLD)
Base 0x400E.C000
Offset 0xC04
Type WO, reset 0x0000.0000
16171819202122232425262728293031
TPD
WOWOWOWOWOWOWOWOWOWOWOWOWOWOWOWOType
0000000000000000Reset
0123456789101112131415
TPD
WOWOWOWOWOWOWOWOWOWOWOWOWOWOWOWOType
0000000000000000Reset
DescriptionResetTypeNameBit/Field
Transmit Poll Demand
When these bits are written with any value, the DMA reads the current
descriptor pointed to by the MAC Current Host Transmit Descriptor
(EMACHOSTXDESC) register. If that descriptor is not available (owned
by the Host), the transmission returns to the SUSPEND state and the
TU bit of the EMACDMARIS is asserted. If the descriptor is available,
the transmission resumes.
0x0WOTPD31:0
1557June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller
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