RM0082
HS_Media independent interface (MII)
Doc ID 018672 Rev 1
523/844
●
SWR
Setting this bit, the DMA Controller resets all MAC internal registers and logic. This bit
is automatically cleared after the reset has completed.
24.7.4
Transmit poll demand register (Register1, DMA)
The Transmit Poll Demand is a register which enables the transmit DMA to check whether or
not the current descriptor is owned by DMA. The transmit poll demand bit assignments are
given in
●
TPD
When these bits are written with any value, the DMA reads the current descriptor
pointed to by DMA Register18 (
Current Host Transmit Descriptor)
. If the pointed
descriptor is available the transmission resumes, otherwise (that is, the descriptor is
owned by the host), transmission returns to suspend state and TU bit in DMA Register5
(
Status)
is asserted.
24.7.5
Receive poll demand register (Register2, DMA)
The Receive Poll Demand is a register which enables the receive DMA to check for new
descriptors. The Receive Poll Demand bit assignments are given in
●
RPD
When these bits are written with any value, the DMA reads the current descriptor
pointed to by DMA Register19
(Current Host Receive Descriptor)
. If the pointed
descriptor is available the reception resumes, otherwise (that is, the descriptor is
owned by the host), reception returns to suspend state and RU bit in DMA Register5
(Status)
is asserted.
24.7.6
Receive descriptor list address register (Register3, DMA)
The receive descriptor list address is a register which points to the start of the Receiver
Descriptor List. The Receive Descriptor List address bit assignments are given in
VALUE
ARBITRATION SCHEME
1‘b0
Round robin with Rx:Tx priority given in PR field.
1‘b1
Rx has priority over Tx.
Table 426.
Transmit poll demand register bit assignments
Bit
Name
Reset Value
Type
Description
[31:00]
TPD
32’h0
RW
Transmit Poll Demand.
Table 427.
Receive poll demand register bit assignments
Bit
Name
Reset Value
Type
Description
[31:00]
32’h0
RW
Receive Poll Demand.