37C672 Datasheet, PDF (95/173 Pages) SMSC Corporation – ENHANCED SUPER I/O CONTROLLER WITH FAST IR

Enhanced Super I/O Controller with Fast IR
Datasheet
BIT 0 empty
Read only
1: The FIFO is completely empty.
0: The FIFO contains at least 1 byte of data.
Table 12.6A - Extended Control Register
R/W
MODE
000: Standard Parallel Port Mode . In this mode the FIFO is reset and common collector 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.
001: 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).
010: 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).
011: 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).
100: Selects EPP Mode: In this mode, EPP is selected if the EPP supported option is selected in configuration
register L3-CRF0. All drivers have active pull-ups (push-pull).
101: Reserved
110: 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).
111: Configuration Mode. In this mode the confgA, confgB registers are accessible at 0x400 and 0x401. All
drivers have active pull-ups (push-pull).
Table 12.6B
IRQ SELECTED
CONFIG REG B
BITS 5:3
15
110
14
101
11
100
10
011
9
010
7
001
5
111
All Others
000
Table 12.6C
CONFIG REG B
DMA SELECTED
BITS 2:0
3
011
2
010
1
001
All Others
000
SMSC FDC37C672
Page 95
DATASHEET
Rev. 10-29-03