Table 60 - 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
= 100 Printer Mode (default)
C
Default = 0x3C
= 000 Standard and Bi-directional (SPP) Mode
= 001 EPP-1.9 and SPP Mode
= 101 EPP-1.7 and SPP Mode
= 010 ECP Mode
on Vcc POR or
Reset_Drv
= 011 ECP and EPP-1.9 Mode
= 111 ECP and EPP-1.7 Mode
Bit[6:3] ECP FIFO Threshold
0111b (default)
Bit[7] PP Interupt 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.
Bits[1:0] PPFDC - muxed PP/FDC control
= 00 Normal Parallel Port Mode
PP Mode Register 2
0xF1 R/W
= 01 PPFD1:
Drive 1 is on the Parallel port pins
= 10 PPFD2: Drive 0 is on the Parallel port pins
Drive 1 is on the Parallel port pins
Drive 0 is on the FDC pins
Default = 0x00
on Vcc POR or
Reset_Drv
Bits[7:2] Reserved. Set to zero.
149
SMSC [ SMSC CORPORATION ]
