Other Parts Discussed in Thread: LMK1C1103, LMK1C1104,
Hi, TI engineers.
I design RMII interface circuit.
I will route the source from external 50MHz crystal oscillator to the MPU and 2 PHY chips.
In TRM, I am confused about the description of RMII_REF_CLK connection.
When using external clock source, other interface pins of RMII is indicated "n", n is 1 to 2, for example RMII"n"_TX_EN means RMII1_TX_EN and RMII2_TX_EN pin.
However, there is no "n" for RMII_REF_CLK.
In datasheet, RMII1_REF_CLK(pin AA16) & RMII2_REF_CLK(pin AA20) is surely noted.
1) Is this meaning that only one routing to Pin AA16 or Pin AA20 is OK except routing to PHY chips?
2) Or should I route both Pin AA16 & AA20 and 2 PHY chips?
In case of 1), I might need 3-output clock buffer(LMK1C1103).
Otherwise, for case 2), I have to use 4-output clock buffer(LMK1C1104).
And also, I want to know what the length of each routing path has to be.
Regard.
