W88113C Datasheet, PDF (70/102 Pages) Winbond – ATAPI CD-ROM DECODER & CONTROLLER

W88113C
PUCTL - Pull Up Resistor Control Register - (write 98h)
This register is used to control the utilization of two pull-up resistors on IO cells. Default value is 0.
Bit 7-6: HIP[1:0] - Host Interface Pull-up Control
Setting these two bits low control two pull-up resistors of host interface I/O cells respectively.
If these two bits are both high, no pull-up resistors exist. Note that DD7 is controlled by
DD7UPB (98h.1) separately,
Bit 5-4: UIP[1:0] - Microprocessor Interface Pull-up Control
Setting these two bits low control two pull-up resistors of uP interface I/O cells respectively. If
these two bits are both high, no pull-up resistors exist.
Bit 3-2: RIP[1:0] - RAM Interface Pull-up Control
Setting these two bits low control two pull-up resistors of RAM interface I/O cells respectively.
If these two bits are both high, no pull-up resistors exist.
Bit 1: DD7UPB - DD7 Pull-up Enable
Setting this bit low disable the internal pull-up resister on the pin DD7 (74).
Bit 0: APIPB - Audio Playback Interface Pull-up Control
Setting this bit low enable the internal pull-up of the audio-playback output pin, including
ALRCK, ABCK and ADAT.
SICTL - Sink Current Control Register - (write 99h) - obsolete
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Publication Release Date: Mar. 1999
Revision 0.61