NAME
REG INDEX
DEFINITION
STATE
the appropriate drive has been selected.
Bit[0] Force Change for FDC0
0=Inactive
1=Active
Bit[1] Force Change for FDC1
0=Inactive
1=Active
Bit[2:7] Reserved, Reads 0
Floppy Data Rate Select Shadow Register
Bit[7] Soft Reset
Floppy Data Rate
Select Shadow
0xC2 R
Bit[6] Power Down
Bit[5] Reserved
Bit[4] PRECOMP 2
Bit[3] PRECOMP 1
Bit[2] PRECOMP 0
Bit[1] Data Rate Select 1
Bit[0] Data Rate Select 0
UART1 FIFO Control Shadow Register
Bit[7] RCVR Trigger MSB
Bit[6] RCVR Trigger LSB
Bit[5] Reserved
UART1 FIFO
Control Shadow
0xC3 R
Bit[4] Reserved
Bit[3] DMA Mode Select
Bit[2] XMIT FIFO Reset
Bit[1] RCVR FIFO Reset
Bit[0] FIFO Enable
UART2 FIFO
Control Shadow
0xC4 R
UART2 FIFO Control Shadow Register
Bit[7] RCVR Trigger MSB
Bit[6] RCVR Trigger LSB
Bit[5] Reserved
Bit[4] Reserved
Bit[3] DMA Mode Select
Bit[2] XMIT FIFO Reset
Bit[1] RCVR FIFO Reset
Bit[0] FIFO Enable
Forced Write Protect
0xC5 R/W
Force Write Protect function forces the FDD
nWRTPRT input active if the FORCE WRTPRT bit is
active. The Force Write Protect function applies to
the nWRTPRT pin in the FDD Interface as well as
the nWRTPRT pin in the Parallel Port FDC.
Default = 0x00
on VTR POR
Bit[0] Force Write Protect bit FDD0
0 = Inactive (Default)
1 = Active “forces the FDD nWRTPRT input active
when the drive has been selected” Note 2
Bit[1:7] Reserved, reads 0.
Ring Filter Select
0xC6 R/W
This register is used to select the operation of the
C
185
SMSC [ SMSC CORPORATION ]
