AR #32544 - Embedded Tri-mode Ethernet MAC Wrapper (Virtex-4) v4.7 - Implementation of MII interface might fail in MAP due to I/O banking rules
Embedded Tri-mode Ethernet MAC Wrapper (Virtex-4) v4.7 - Implementation of MII interface might fail in MAP due to I/O banking rules
| AR# | 32544 |
| Part | IP-DS-Embedded Tri-Mode EMAC |
| Last Modified | 2009-04-23 00:00:00.0 |
| Status | Active |
| Keywords | place, MII_TX_CLK, IO Standards, 864 |
Description
Keywords: place, MII_TX_CLK, IO Standards, 864
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."
Solution
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";