W83627EHG Nuvoton Technology Corporation of America, W83627EHG Datasheet - Page 148

• Manufacturer Part Number: W83627EHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627EHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Drive type ID1 Drive type ID0 (Bit 5, 4):
These two bits reflect two of the bits in LD0 CRF2. Which two bits are reflected depends on the last
drive selection in the DO register.
Floppy Boot drive 1, 0 (Bit 3, 2):
These two bits reflect the value of LD0 CRF1, bits 7 and 6.
Tape Sel 1, Tape Sel 0 (Bit 1, 0):
These two bits assign a logical drive number to the tape drive. Drive 0 is not available as a tape drive
and is reserved for the floppy disk boot drive.
8.2.5
The Main Status Register is used to control the flow of data between the microprocessor and the
controller. The bit definitions for this register are as follows:
8.2.6
7
6
Main Status Register (MS Register) (Read base address + 4)
Data Rate Register (DR Register) (Write base address + 4)
TAPE SEL 1
5
4
0
0
1
1
3
2
1
0
Reserved.
FDD 0 Busy, (D0B = 1), FDD number 0 is in the SEEK mode.
Reserved.
Reserved.
FDC Busy, (CB). A read or write command is in the process when CB = HIGH.
Non-DMA mode, the FDC is in the non-DMA mode, this bit is set only during the
execution phase in non-DMA mode.
Transition to LOW state indicates execution phase has ended.
DATA INPUT/OUTPUT, (DIO). If DIO= HIGH then transfer is from Data Register to the processor.
If DIO = LOW then transfer is from processor to Data Register.
Request for Master (RQM). A high on this bit indicates Data Register
is ready to send or receive data to or from the processor.
TAPE SEL 0
0
1
0
1
W83627EHF/EF, W83627EHG/EG
-137-
Publication Release Date: April 7, 2009
DRIVE SELECTED
None
1
2
3
Version 1.94