I have never used it but going by the data sheet, It appears that it is only an H-bridge. What kind of stepper motor were you trying to drive with it.
Input 1 and input 2 are used to drive their respective outputs. When the input goes high, the output goes high.
The error flag caught my eye, this is definitely something that could be useful. You can use this to detect when the motor has stalled.
Remember not to push the IC to it's limit. Even though the data sheet says it can be run at 5A, it should not be pushed to that limit for an excessive amount of time. It will shorten the life of the IC or could even burn it out completely.
The IC seems fairly straight forward, is there anything more specific that you were worried about?