LPC47N237-MD SMSC [SMSC Corporation], LPC47N237-MD Datasheet - Page 60

• Manufacturer Part Number: LPC47N237-MD
• Description: 3.3V I/O CONTROLLER FOR PORT REPLICATORS AND DOCKING STATIONS
• Manufacturer: SMSC [SMSC Corporation]

Revision 0.3 (10-26-04)
R/W
000:
001:
010:
011:
100:
101:
110:
111:
Standard Parallel Port Mode . In this mode the FIFO is reset and common drain drivers are
used on the control lines (nStrobe, nAutoFd, nInit and nSelectIn). Setting the direction bit will
not tri-state the output drivers in this mode.
PS/2 Parallel Port Mode. Same as above except that direction may be used to tri-state the
data lines and reading the data register returns the value on the data lines and not the value
in the data register. All drivers have active pull-ups (push-pull).
Parallel Port FIFO Mode. This is the same as 000 except that bytes are written or DMAed to
the FIFO. FIFO data is automatically transmitted using the standard parallel port protocol.
Note that this mode is only useful when direction is 0. All drivers have active pull-ups
(push-pull).
ECP Parallel Port Mode. In the forward direction (direction is 0) bytes placed into the
ecpDFifo and bytes written to the ecpAFifo are placed in a single FIFO and transmitted
automatically to the peripheral using ECP Protocol. In the reverse direction (direction is 1)
bytes are moved from the ECP parallel port and packed into bytes in the ecpDFifo. All
drivers have active pull-ups (push-pull).
Selects EPP Mode: In this mode, EPP is selected if the EPP supported option is selected in
configuration register CR04 (Bits[1,0] and Bit[6]). All drivers have active pull-ups (push-pull).
Reserved
Test Mode. In this mode the FIFO may be written and read, but the data will not be
transmitted on the parallel port. All drivers have active pull-ups (push-pull).
Configuration Mode. In this mode the confgA, confgB registers are accessible at 0x400 and
0x401. All drivers have active pull-ups (push-pull).
DMA SELECTED
IRQ SELECTED
All Others
All Others
Table 9.8 - Parallel Port DMA Selection
Table 9.7 - Parallel Port IRQ Selection
Table 9.6 - Extended Control Register
15
14
11
10
9
7
5
3
2
1
DATASHEET
Page 60
MODE
3.3v I/O Controller for Port Replicators and Docking Stations
BITS [5:3]
BITS [2:0]
CNFGB
CNFGB
000
110
101
100
011
010
001
111
000
011
010
001
SMSC DS – LPC47N237