We have an older phone line system that we upgraded to an Ethernet communication interface and the first 10 units are in the field working. We do not have any of the first batch units available for testing. We did call one of customers and he did indicate that the ACE unit had a part number of ST16C450. These parts are out of production so we switched to the TI version of TL16C450. The problem we are having is the Line Status Register (LSR) does not get set as indicated in the manual page 15 "Table 2. ACE Reset Functions ". Bits Bit #5 and #6 are to be set high and all others are to get cleared; set low (Bit#7 = Not used). Is this a know problem with this chip?
Is there a work around?