Table 68 - Floppy Disk Controller, Logical Device 0 [Logical Device Number = 0x00]
NAME
REG INDEX
DEFINITION
STATE
FDD0
0xF4 R/W Bits[1:0] Drive Type Select: DT1, DT0
Bits[2] Read as 0 (read only)
C
Default = 0x00
on VCC POR,
VTR POR and
HARD RESET
Bits[4:3] Data Rate Table Select: DRT1, DRT0
Bits[5] Read as 0 (read only)
Bits[6] Precompensation Disable PTS
=0 Use Precompensation
=1 No Precompensation
Bits[7] Read as 0 (read only)
FDD1
0xF5 R/W Refer to definition and default for 0xF4
C
Table 69 - Parallel Port, Logical Device 3 [Logical Device Number = 0x03]
NAME
REG INDEX
DEFINITION
STATE
PP Mode Register
0xF0 R/W Bits[2:0] Parallel Port Mode
C
= 100
= 000
= 001
= 101
= 010
= 011
= 111
Printer Mode (default)
Default = 0x3C
on VCC POR,
VTR POR and
HARD RESET
Standard and Bi-directional (SPP) Mode
EPP-1.9 and SPP Mode
EPP-1.7 and SPP Mode
ECP Mode
ECP and EPP-1.9 Mode
ECP and EPP-1.7 Mode
Bit[6:3] ECP FIFO Threshold
0111b (default)
Bit[7] PP Interrupt Type
Not valid when the parallel port is in the Printer
Mode (100) or the Standard & Bi-directional Mode
(000).
= 1
= 0
Pulsed Low, released to high-Z.
IRQ follows nACK when parallel port in EPP
Mode or [Printer, SPP, EPP] under ECP.
IRQ level type when the parallel port is in ECP, TEST,
or Centronics FIFO Mode.
0xF1 R/W
PP Mode Register 2
Bits[3:0] Reserved. Set to zero
Bit [4] TIMEOUT_SELECT
Default = 0x00
on VCC POR,
VTR POR and
HARD RESET
= 0
TMOUT (EPP Status Reg.) cleared on write of
‘1’ to TMOUT.
TMOUT cleared on trailing edge of read of
EPP Status Reg.
= 1
Bits[7:5] Reserved. Set to zero.
Page 155
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