W88113C Datasheet, PDF (90/102 Pages) Winbond – ATAPI CD-ROM DECODER & CONTROLLER

W88113C
5.3.6 BSY flag control
BSY is bit-7 of ATAPI Status Register.
BSY set
chip reset
host reset
Set bit SRST in ATAPT Device Control
Register
Set SETBSY (20h.w3) if APKT (30h.r0) is
low
Host issues Execute Diagnostics Command
(opcode 90h)
Host issue ATA Command when drive is
selected
Transfer end if ADCEN (18h.6) is enabled
Set ADTT (17h.w2)
Set DSCT (17h.w5) if ABYEN (18h.1) is
enabled - lasting 3 system clocks
BSY clear
Set CLRBSY (20h.w4) if APKT (30h.r0) is low
Set DRQT (17h.w1) if PIO (1Fh.2) is high
Host issue ATAPI Command (opcode A0h) if
APKTEN (18h.7) is high
Automatic Status Completion sequence,
enabled by SCT (17h.w0) or ASCEN (18h.5)
DFRDYb (01h.r1) becomes low after ADTT
(17h.w2) is set, if PIO (1Fh.2) is high
5.3.7 Pin HIRQ control
Pin HIRQ (47) is set or clear by the following conditions if the drive is selected and nIEN is enabled in
the ATAPI Device Control Register.
HIRQ is activated by the following:
• Automatic Packet Transfer sequence, enabled by APKTEN (18h.7)
• Automatic Status Completion sequence, enabled by SCT (17h.w0) or ASCEN (18h.5)
• Write MISC0 (2Eh) with bit-3 high
HIRQ is de-activated by the following:
• Chip reset or host reset or firmware rest
• Set bit SRST in the ATAPI Device Control Register high
• Host issue ATA command while the drive is selected
• Host read ATAPI Status Register while the drive is selected
• Write MISC0 (2Eh) with bit-3 low
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Publication Release Date: Mar. 1999
Revision 0.61