W88113C Datasheet, PDF (26/102 Pages) Winbond – ATAPI CD-ROM DECODER & CONTROLLER

W88113C
DHTACK - DRAM to Host Transfer Acknowledge - (write 0Eh)
Writing DHTACK, regardless of what data is written, deactivates TENDb (01h.r6) that caused by data-
in transfer.
STAT2 - Status Register 2 - (read 0Eh)
Bit 7-4: RMOD[3:0] - Raw Mode Bit
RMOD2-0 are directly latched from bit 2-0 from the 4th header byte and RMOD3 is high if
any one of the other 5 bits in the mode byte is high. RMOD3 is also high if a mode byte
erasure is detected.
Bit 3: MODE2 - Mode 2 Selected Flag
This bit reflects the setting of M2RQ (0Bh.w3).
Bit 2: NOCOR - No Correction
If ECC logic is enabled by bit EDCEN (0Ah.w5), and QCEN (0Ah.w1) or PCEN (0Ah.w0), this
bit becomes high if ECC logic is interrupted the followings:
• CWEN (0Bh.w4) is disabled.
• Mode mismatch is detected while MCRQ (0Bh.w1) is enabled.
• Mode erasure is detected while MCRQ (0Bh.w1) is enabled. A mode erasure occurs if the
incoming C2PO flag is set for the fourth header byte, indicating unreliable mode data.
• Form 2 enabled while ECC logic is set to mode 2. Form 2 blocks should not be corrected.
Form 2 can be enabled by control bit F2RQ (0Bh.w2), or by the Form bit in the Subheader
byte if ACEN (0Ah.w4) is enabled.
• Form bit erasure while ECC logic is set to mode 2 and ACEN is enabled. A form bit
erasure is detected if the incoming C2PO flags are set for both Form bits in the Subheader
bytes.
• ILSYN (0Ch.r6) becomes high while SDEN (0Bh.w6) is enabled
Bit 1: RFERA - Raw Form Erasure
This bit becomes high when a form bit erasure was detected. A form bit erasure is detected if
the incoming C2PO flags are set for both Form bits in the Submode bytes (bit 5 in byte 18
and 22). RFERA becomes valid when SRIb (01h.r5) becomes active-low, and remains valid
until the next block sync.
Bit 0: RFORM - Raw Form Bit
This bit is high if the Form bit is high in the Submode bytes of the incoming serial data.
RFORM becomes valid when flag SRIb (01h.r5) becomes active-low, and remains valid until
the next block sync.
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Publication Release Date: Mar. 1999
Revision 0.61