FDC37B72X Datasheet PDF - SMSC -> Microchip

GENERAL DESCRIPTION
The FDC87W21 is an enhanced version of the FDC87W22 --- which integrates the disk drive adapter, serial port (UART), IrDA 1.0 SIR, parallel port, IDE interface, configurable plugand-play registers for the whole chip --- adding powerful features: IrDA 1.1 (MIR for 1.152 Mbps or FIR for 4 Mbps), TV remote IR. In addition to the function enhancement, FDC87W21 is pin-topin compatible to FDC87W22.