K60P100M100SF2RM Datasheet, PDF (1156/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Memory Map/Register Definition
ENET_TFWR field descriptions
Field
31–9
Reserved
8
STRFWD
7–6
Reserved
5–0
TFWR
Description
This read-only field is reserved and always has the value zero.
Store and forward enable
0 Disabled, the transmission start threshold is programmed in TFWR.
1 Enabled.
This read-only field is reserved and always has the value zero.
Transmit FIFO write
If STRFWD is cleared, indicates the number of bytes written to the transmit FIFO before transmission of a
frame begins.
NOTE: If a frame with less than the threshold is written,it is still sent, independently of this threshold
setting. The threshold is only relevant if the frame is larger than the threshold given.
000000
000001
000010
000011
111111
64 bytes written
64 bytes written
128 bytes written
192 bytes written
4032 bytes written
44.3.19 Receive Descriptor Ring Start Register (ENET_RDSR)
RDSR points to the start of the circular receive buffer descriptor queue in external
memory. This pointer must be 64-bit aligned (bits 2–0 must be zero); however, it is
recommended to be 128-bit aligned (evenly divisible by 16). This register is not reset and
must be initialized prior to operation.
Address: ENET_RDSR is 400C_0000h base + 180h offset = 400C_0180h
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
0
R_DES_START
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
ENET_RDSR field descriptions
Field
Description
31–3
Pointer to the start of the receive buffer descriptor queue.
R_DES_START
2–0
Reserved
This read-only field is reserved and always has the value zero.
1156
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.