W83877TF Datasheet, PDF (126/154 Pages) Winbond – I/O chip disk drive adapter

W83877TF
Drive Rate Table
DRTA1
DRTA0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
Data Rate
DRATE1
DRATE0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
0
0
0
1
1
0
operational data rate
MFM
FM
1M
500K
300K
250K
---
250K
150K
125K
1M
500K
500K
250K
---
250K
250K
125K
1M
500K
2M
250K
---
250K
---
125K
8.2.36 Configuration Register 31 (CR31), default=00H
When the device is in Extended Function mode and EFIR is 31H, the CR31 register can be accessed
through EFDR. The bit definitions are as follows:
765
43
21
0
reserved
reserved
IRQMODS
reserved
SCIIRQ0
SCIIRQ1
SCIIRQ2
SCIIRQ3
SCIIRQ3 ~ SCIIRQ0 (Bit 7 - bit 4):
The four bits select one IRQ pin for the SCI signal except for dedicated SCI signal output pin. Any
unselected pin is in tri-state.
- 100 -
Publication Release Date: March 1998
Version 0.61