W88113C Datasheet, PDF (73/102 Pages) Winbond – ATAPI CD-ROM DECODER & CONTROLLER

W88113C
SKIPC - Skip Count - (read/write 9Eh)
This register is used as skip count to implement a partial-hit event of transfer cache. If ACMEN
(9Ch.6) is high, the following functions are executed right after SKIPC (9Eh) is set N:
• BUFC (9Bh,r) minus N
• TCC (9Dh) minus N
• TBH/L (25h/24h) plus N
• SKIPC (9Eh) minus N
After execution of the above operations, the value in SKIPC (9Eh) is 0.
This register is 0 after chip reset, host reset and firmware reset. This register is stuck at 0 if ACMEN
(9Ch.6) is low.
TTC - Total Transfer Count - (read/write 9Fh)
This register is used as total transfer count. If ACMEN (9Ch.6) is high, TTC (9Fh) decrements at the
end of each data-in block transfer unless the value is zero. The value follows 0 is 0. The following
events are generated at the end of data-in transfer only if TCC (9Fh) is zero:
• TENDb (01h.r6) ← 0
• Automatic Status Complete Sequence if ASCEN (18h.5) is enabled
This register is 0 after chip reset, host reset and firmware reset. This register is stuck at 0 if ACMEN
(9Ch.6) is low.
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Publication Release Date: Mar. 1999
Revision 0.61