TLK105 Datasheet, PDF (63/99 Pages) Texas Instruments – Industrial Temp, Single Port 10/100Mbs Ethernet Physical Layer Transceiver

TLK105
TLK106
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SLLSEB8A – AUGUST 2012 – REVISED MARCH 2013
Table 8-25. RMII Control and Status Register (RCSR), address 0x0017 (continued)
BIT NAME
4 RMII Revision
Select
3 RMII OVFL Status
2 RMII OVFL Status
1:0 ELAST_FUB
DEFAULT
0,RW
0,COR
0,COR
<01>,RW
DESCRIPTION
RMII Revision Select:
1 = (RMII revision 1.0) CRS_DV will remain asserted until final data is transferred.
CRS_DV will not toggle at the end of a packet.
0 = (RMII revision 1.2) CRS_DV will toggle at the end of a packet to indicate de-
assertion of CRS.
RX FIFO Over Flow Status:
1 = Normal
0 = Overflow detected
RX FIFO Under Flow Status:
1 = Normal
0 = Underflow detected
Receive Elasticity Buffer Size:
This field controls the Receive Elasticity Buffer which allows for frequency variation
tolerance between the 50MHz RMII clock and the recovered data. The following values
indicate the tolerance in bits for a single packet. The minimum setting allows for standard
Ethernet frame sizes at ±50ppm accuracy for both RMII and Receive clocks. For greater
frequency tolerance the packet lengths may be scaled (for ±100ppm, divide the packet
lengths by 2).
00 = 14 bit tolerance (up to 16800 byte packets)
01 = 2 bit tolerance (up to 2400 byte packets)
10 = 6 bit tolerance (up to 7200 byte packets)
11 = 10 bit tolerance (up to 12000 byte packets)
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