When a design with MII interface is implemented, intermittent failures occur in MAP with the following error:
"ERROR:Place:864 - Incompatible IOB's are locked to the same bank 2 Conflicting IO Standards are:
IO Standard 1: Name = LVCMOS25, VRR, VCCO = 2.50, TERM = NONE
List of locked IOB's: HOSTCLK
IO Standard 2: Name = LVTTL, VREF = NR, VCCO = 3.30, TERM = NONE
List of locked IOB's: MII_TX_CLK_1
These IO Standards are incompatible due to VCCO mismatch."
To avoid this error, add the following constraints in the UCF:
INST "MII_TX_CLK_1" LOC = "Bank4";
INST "MII_TX_CLK_0" LOC = "Bank4";
INST "MII_RX_CLK_1" LOC = "Bank4";
INST "MII_RX_CLK_0" LOC = "Bank4";
| AR# 32544 | |
|---|---|
| Date | 12/15/2012 |
| Status | Active |
| Type | General Article |