DS537 Datasheet, PDF (76/148 Pages) Xilinx, Inc – LogiCORE IP XPS LL TEMAC

LogiCORE IP XPS LL TEMAC (v2.03a)
X-Ref Target - Figure 49
DMA Core Register
CURDESC_PTR
register value
Buffer Descriptors
in external memory
NXTDESC_PTR
CURBUF_ADDR
CURBUF_LENGTH
STS_CTRL_APP0
APP1
APP2
APP3
APP4
NXTDESC_PTR
CURBUF_ADDR
CURBUF_LENGTH
STS_CTRL_APP0
APP1
APP2
APP3
APP4
Data Buffer
in external memory
Data
Data Buffer
in external memory
Data
Unused
Unused
LlinkTemac_CLK
TemacLlink_Data(0:31)
HDR Payload (variable)
Footer
He_{ader Word 0}
P_{ayload Words} FooterFWooortedr0FWooortedr1FWooortedr2FWooortedr₃FWo-ooMrtedCr4FAWo_{S-ooTMrt_edCAr5FAWDoS-RooTBrt__edCUArA6WDS-RoTTr___dLFL7L_AT- GPVILD&AN&IP_R_TMXA_CGCA&SSRRTA_XFW_LBAYGTECNT}
& _{MAC_MCAST_FLAG}
DS537_49_091909
Figure 49: Receive DMA Buffer Descriptor LocalLink Field Mapping
Frame Transmission
Padding
When fewer than 46 bytes of data are supplied to the XPS_LL_TEMAC, the transmitter will add padding up to the
minimum frame length. However, when the FCS field is being provided as part of the frame by the user, the frame
must already be padded if necessary to maintain the minimum frame length.
www.xilinx.com
76